3479 lines
149 KiB
Plaintext
3479 lines
149 KiB
Plaintext
# tzdb data for North and Central America and environs
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# This file is in the public domain, so clarified as of
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# 2009-05-17 by Arthur David Olson.
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# also includes Central America and the Caribbean
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# This file is by no means authoritative; if you think you know better,
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# go ahead and edit the file (and please send any changes to
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# tz@iana.org for general use in the future). For more, please see
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# the file CONTRIBUTING in the tz distribution.
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# From Paul Eggert (1999-03-22):
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# A reliable and entertaining source about time zones is
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# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
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###############################################################################
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# United States
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# From Paul Eggert (1999-03-31):
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# Howse writes (pp 121-125) that time zones were invented by
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# Professor Charles Ferdinand Dowd (1825-1904),
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# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
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# His pamphlet "A System of National Time for Railroads" (1870)
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# was the result of his proposals at the Convention of Railroad Trunk Lines
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# in New York City (1869-10). His 1870 proposal was based on Washington, DC,
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# but in 1872-05 he moved the proposed origin to Greenwich.
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# From Paul Eggert (2018-03-20):
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# Dowd's proposal left many details unresolved, such as where to draw
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# lines between time zones. The key individual who made time zones
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# work in the US was William Frederick Allen - railway engineer,
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# managing editor of the Travelers' Guide, and secretary of the
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# General Time Convention, a railway standardization group. Allen
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# spent months in dialogs with scientific and railway leaders,
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# developed a workable plan to institute time zones, and presented it
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# to the General Time Convention on 1883-04-11, saying that his plan
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# meant "local time would be practically abolished" - a plus for
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# railway scheduling. By the next convention on 1883-10-11 nearly all
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# railroads had agreed and it took effect on 1883-11-18. That Sunday
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# was called the "day of two noons", as some locations observed noon
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# twice. Allen witnessed the transition in New York City, writing:
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#
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# I heard the bells of St. Paul's strike on the old time. Four
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# minutes later, obedient to the electrical signal from the Naval
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# Observatory ... the time-ball made its rapid descent, the chimes
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# of old Trinity rang twelve measured strokes, and local time was
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# abandoned, probably forever.
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#
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# Most of the US soon followed suit. See:
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# Bartky IR. The adoption of standard time. Technol Cult 1989 Jan;30(1):25-56.
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# https://dx.doi.org/10.2307/3105430
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# From Paul Eggert (2005-04-16):
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# That 1883 transition occurred at 12:00 new time, not at 12:00 old time.
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# See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005).
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# From Paul Eggert (2006-03-22):
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# A good source for time zone historical data in the US is
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# Thomas G. Shanks, The American Atlas (5th edition),
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# San Diego: ACS Publications, Inc. (1991).
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# Make sure you have the errata sheet; the book is somewhat useless without it.
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# It is the source for most of the pre-1991 US entries below.
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# From Paul Eggert (2001-03-06):
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# Daylight Saving Time was first suggested as a joke by Benjamin Franklin
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# in his whimsical essay "An Economical Project for Diminishing the Cost
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# of Light" published in the Journal de Paris (1784-04-26).
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# Not everyone is happy with the results:
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#
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# I don't really care how time is reckoned so long as there is some
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# agreement about it, but I object to being told that I am saving
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# daylight when my reason tells me that I am doing nothing of the kind.
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# I even object to the implication that I am wasting something
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# valuable if I stay in bed after the sun has risen. As an admirer
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# of moonlight I resent the bossy insistence of those who want to
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# reduce my time for enjoying it. At the back of the Daylight Saving
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# scheme I detect the bony, blue-fingered hand of Puritanism, eager
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# to push people into bed earlier, and get them up earlier, to make
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# them healthy, wealthy and wise in spite of themselves.
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#
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# -- Robertson Davies, The diary of Samuel Marchbanks,
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# Clarke, Irwin (1947), XIX, Sunday
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#
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# For more about the first ten years of DST in the United States, see
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# Robert Garland, Ten years of daylight saving from the Pittsburgh standpoint
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# (Carnegie Library of Pittsburgh, 1927).
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# http://www.clpgh.org/exhibit/dst.html
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#
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# Shanks says that DST was called "War Time" in the US in 1918 and 1919.
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# However, DST was imposed by the Standard Time Act of 1918, which
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# was the first nationwide legal time standard, and apparently
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# time was just called "Standard Time" or "Daylight Saving Time".
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# From Arthur David Olson:
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# US Daylight Saving Time ended on the last Sunday of *October* in 1974.
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# See, for example, the front page of the Saturday, 1974-10-26
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# and Sunday, 1974-10-27 editions of the Washington Post.
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# From Arthur David Olson:
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# Before the Uniform Time Act of 1966 took effect in 1967, observance of
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# Daylight Saving Time in the US was by local option, except during wartime.
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# From Arthur David Olson (2000-09-25):
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# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama.
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# In the introduction, Oboler spoke of "Eastern Peace Time."
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# An AltaVista search turned up:
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# https://web.archive.org/web/20000926032210/http://rowayton.org/rhs/hstaug45.html
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# "When the time is announced over the radio now, it is 'Eastern Peace
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# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful."
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# (August 1945) by way of confirmation.
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#
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# From Paul Eggert (2017-09-23):
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# This was the V-J Day issue of the Clamdigger, a Rowayton, CT newsletter.
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# From Joseph Gallant citing
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# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987):
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# At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set
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# to switch to London for Attlee's address, but the American people
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# never got to hear his speech live. According to one press account,
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# CBS' Bob Trout was first to announce the word of Japan's surrender,
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# but a few seconds later, NBC, ABC and Mutual also flashed the word
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# of surrender, all of whom interrupting the bells of Big Ben in
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# London which were to precede Mr. Attlee's speech.
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# From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From
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# Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times:
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#
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# ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender.
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# Any announcement from Asia would reach St. John's New York newsroom on a
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# wire service teletype machine, which had prescribed signals for major news.
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# Associated Press, for example, would ring five bells before spewing out
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# typed copy of an important story, and 10 bells for news "of transcendental
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# importance."
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#
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# On Aug. 14, stalling while talking steadily into the NBC networks' open
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# microphone, St. John heard five bells and waited only to hear a sixth bell,
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# before announcing confidently: "Ladies and gentlemen, World War II is over.
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# The Japanese have agreed to our surrender terms."
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#
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# He had scored a 20-second scoop on other broadcasters.
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# From Arthur David Olson (2005-08-22):
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# Paul has been careful to use the "US" rules only in those locations
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# that are part of the United States; this reflects the real scope of
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# U.S. government action. So even though the "US" rules have changed
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# in the latest release, other countries won't be affected.
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# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
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Rule US 1918 1919 - Mar lastSun 2:00 1:00 D
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Rule US 1918 1919 - Oct lastSun 2:00 0 S
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Rule US 1942 only - Feb 9 2:00 1:00 W # War
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Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace
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Rule US 1945 only - Sep lastSun 2:00 0 S
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Rule US 1967 2006 - Oct lastSun 2:00 0 S
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Rule US 1967 1973 - Apr lastSun 2:00 1:00 D
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Rule US 1974 only - Jan 6 2:00 1:00 D
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Rule US 1975 only - Feb 23 2:00 1:00 D
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Rule US 1976 1986 - Apr lastSun 2:00 1:00 D
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Rule US 1987 2006 - Apr Sun>=1 2:00 1:00 D
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Rule US 2007 max - Mar Sun>=8 2:00 1:00 D
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Rule US 2007 max - Nov Sun>=1 2:00 0 S
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# From Arthur David Olson, 2005-12-19
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# We generate the files specified below to guard against old files with
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# obsolete information being left in the time zone binary directory.
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# We limit the list to names that have appeared in previous versions of
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# this time zone package.
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# We do these as separate Zones rather than as Links to avoid problems if
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# a particular place changes whether it observes DST.
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# We put these specifications here in the northamerica file both to
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# increase the chances that they'll actually get compiled and to
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# avoid the need to duplicate the US rules in another file.
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# Zone NAME GMTOFF RULES FORMAT [UNTIL]
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Zone EST -5:00 - EST
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Zone MST -7:00 - MST
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Zone HST -10:00 - HST
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Zone EST5EDT -5:00 US E%sT
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Zone CST6CDT -6:00 US C%sT
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Zone MST7MDT -7:00 US M%sT
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Zone PST8PDT -8:00 US P%sT
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# From U. S. Naval Observatory (1989-01-19):
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# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
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# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
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# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
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# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
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# USA MOUNTAIN 7 H BEHIND UTC DENVER
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# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
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# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
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# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
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# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
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# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
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# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
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# USA " 9 H BEHIND UTC APR 3 - OCT 30
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# USA HAWAII 10 H BEHIND UTC
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# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
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# From Arthur David Olson (1989-01-21):
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# The above dates are for 1988.
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# Note the "AKST" and "AKDT" abbreviations, the claim that there's
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# no DST in Samoa, and the claim that there is DST in Alaska and the
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# Aleutians.
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# From Arthur David Olson (1988-02-13):
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# Legal standard time zone names, from United States Code (1982 Edition and
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# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
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# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966
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# took effect), as explained in sections 263 and 261:
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# (none)
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# United States standard eastern time
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# United States standard mountain time
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# United States standard central time
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# United States standard Pacific time
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# (none)
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# United States standard Alaska time
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# (none)
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# Next, names from 1967-04-01 until 1983-11-30 (the date for
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# public law 98-181):
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# Atlantic standard time
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# eastern standard time
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# central standard time
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# mountain standard time
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# Pacific standard time
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# Yukon standard time
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# Alaska-Hawaii standard time
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# Bering standard time
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# And after 1983-11-30:
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# Atlantic standard time
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# eastern standard time
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# central standard time
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# mountain standard time
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# Pacific standard time
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# Alaska standard time
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# Hawaii-Aleutian standard time
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# Samoa standard time
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# The law doesn't give abbreviations.
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#
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# From Paul Eggert (2016-12-19):
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# Here are URLs for the 1918 and 1966 legislation:
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# http://uscode.house.gov/statviewer.htm?volume=40&page=451
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# http://uscode.house.gov/statviewer.htm?volume=80&page=108
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# Although the 1918 names were officially "United States Standard
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# Eastern Time" and similarly for "Central", "Mountain", "Pacific",
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# and "Alaska", in practice "Standard" was placed just before "Time",
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# as codified in 1966. In practice, Alaska time was abbreviated "AST"
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# before 1968. Summarizing the 1967 name changes:
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# 1918 names 1967 names
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# -08 Standard Pacific Time (PST) Pacific standard time (PST)
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# -09 (unofficial) Yukon (YST) Yukon standard time (YST)
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# -10 Standard Alaska Time (AST) Alaska-Hawaii standard time (AHST)
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# -11 (unofficial) Nome (NST) Bering standard time (BST)
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#
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# From Paul Eggert (2000-01-08), following a heads-up from Rives McDow:
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# Public law 106-564 (2000-12-23) introduced ... "Chamorro Standard Time"
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# for time in Guam and the Northern Marianas. See the file "australasia".
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#
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# From Paul Eggert (2015-04-17):
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# HST and HDT are standardized abbreviations for Hawaii-Aleutian
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# standard and daylight times. See section 9.47 (p 234) of the
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# U.S. Government Printing Office Style Manual (2008)
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# https://www.gpo.gov/fdsys/pkg/GPO-STYLEMANUAL-2008/pdf/GPO-STYLEMANUAL-2008.pdf
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# From Arthur David Olson, 2005-08-09
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# The following was signed into law on 2005-08-08.
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#
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# H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS.
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# (a) Amendment.--Section 3(a) of the Uniform Time Act of 1966 (15
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# U.S.C. 260a(a)) is amended--
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# (1) by striking "first Sunday of April" and inserting "second
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# Sunday of March"; and
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# (2) by striking "last Sunday of October" and inserting "first
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# Sunday of November'.
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# (b) Effective Date.--Subsection (a) shall take effect 1 year after the
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# date of enactment of this Act or March 1, 2007, whichever is later.
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# (c) Report to Congress.--Not later than 9 months after the effective
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# date stated in subsection (b), the Secretary shall report to Congress
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# on the impact of this section on energy consumption in the United
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# States.
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# (d) Right to Revert.--Congress retains the right to revert the
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# Daylight Saving Time back to the 2005 time schedules once the
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# Department study is complete.
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# US eastern time, represented by New York
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# Connecticut, Delaware, District of Columbia, most of Florida,
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# Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky
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# (except America/Kentucky/Louisville below), Maine, Maryland, Massachusetts,
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# New Hampshire, New Jersey, New York, North Carolina, Ohio,
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# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee,
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# Vermont, Virginia, West Virginia
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# From Dave Cantor (2004-11-02):
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# Early this summer I had the occasion to visit the Mount Washington
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# Observatory weather station atop (of course!) Mount Washington [, NH]....
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# One of the staff members said that the station was on Eastern Standard Time
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# and didn't change their clocks for Daylight Saving ... so that their
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# reports will always have times which are 5 hours behind UTC.
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# From Paul Eggert (2005-08-26):
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# According to today's Huntsville Times
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# http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1
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# a few towns on Alabama's "eastern border with Georgia, such as Phenix City
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# in Russell County, Lanett in Chambers County and some towns in Lee County,
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# set their watches and clocks on Eastern time." It quotes H.H. "Bubba"
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# Roberts, city administrator in Phenix City. as saying "We are in the Central
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# time zone, but we do go by the Eastern time zone because so many people work
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# in Columbus."
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#
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# From Paul Eggert (2017-02-22):
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# Four cities are involved. The two not mentioned above are Smiths Station
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# and Valley. Barbara Brooks, Valley's assistant treasurer, heard it started
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# because West Point Pepperell textile mills were in Alabama while the
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# corporate office was in Georgia, and residents voted to keep Eastern
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# time even after the mills closed. See: Kazek K. Did you know which
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# Alabama towns are in a different time zone? al.com 2017-02-06.
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# http://www.al.com/living/index.ssf/2017/02/do_you_know_which_alabama_town.html
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# From Paul Eggert (2014-09-06):
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# Monthly Notices of the Royal Astronomical Society 44, 4 (1884-02-08), 208
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# says that New York City Hall time was 3 minutes 58.4 seconds fast of
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# Eastern time (i.e., -4:56:01.6) just before the 1883 switch. Round to the
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# nearest second.
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# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
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Rule NYC 1920 only - Mar lastSun 2:00 1:00 D
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Rule NYC 1920 only - Oct lastSun 2:00 0 S
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Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
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Rule NYC 1921 1954 - Sep lastSun 2:00 0 S
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Rule NYC 1955 1966 - Oct lastSun 2:00 0 S
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# Zone NAME GMTOFF RULES FORMAT [UNTIL]
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Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58
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-5:00 US E%sT 1920
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-5:00 NYC E%sT 1942
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-5:00 US E%sT 1946
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-5:00 NYC E%sT 1967
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-5:00 US E%sT
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# US central time, represented by Chicago
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# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia,
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# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and
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# Washington counties), Illinois, western Indiana
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# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
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# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western
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# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern
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# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota,
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# western Tennessee, most of Texas, Wisconsin
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# From Paul Eggert (2018-01-07):
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# In 1869 the Chicago Astronomical Society contracted with the city to keep
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# time. Though delayed by the Great Fire, by 1880 a wire ran from the
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# Dearborn Observatory (on the University of Chicago campus) to City Hall,
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# which then sent signals to police and fire stations. However, railroads got
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# their time signals from the Allegheny Observatory, the Madison Observatory,
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# the Ann Arbor Observatory, etc., so their clocks did not agree with each
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# other or with the city's official time. The confusion took some years to
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# clear up. See:
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# Moser M. How Chicago gave America its time zones. Chicago. 2018-01-04.
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# http://www.chicagomag.com/city-life/January-2018/How-Chicago-Gave-America-Its-Time-Zones/
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# From Larry M. Smith (2006-04-26) re Wisconsin:
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# https://docs.legis.wisconsin.gov/statutes/statutes/175.pdf
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# is currently enforced at the 01:00 time of change. Because the local
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# "bar time" in the state corresponds to 02:00, a number of citations
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# are issued for the "sale of class 'B' alcohol after prohibited
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# hours" within the deviated hour of this change every year....
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#
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# From Douglas R. Bomberg (2007-03-12):
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# Wisconsin has enacted (nearly eleventh-hour) legislation to get WI
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# Statue 175 closer in synch with the US Congress' intent....
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# https://docs.legis.wisconsin.gov/2007/related/acts/3
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# From an email administrator of the City of Fort Pierre, SD (2015-12-21):
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# Fort Pierre is technically located in the Mountain time zone as is
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# the rest of Stanley County. Most of Stanley County and Fort Pierre
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# uses the Central time zone due to doing most of their business in
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# Pierre so it simplifies schedules. I have lived in Stanley County
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# all my life and it has been that way since I can remember. (43 years!)
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#
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# From Paul Eggert (2015-12-25):
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# Assume this practice predates 1970, so Fort Pierre can use America/Chicago.
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# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
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Rule Chicago 1920 only - Jun 13 2:00 1:00 D
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Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
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Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D
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Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
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Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S
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Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S
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# Zone NAME GMTOFF RULES FORMAT [UNTIL]
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Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24
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-6:00 US C%sT 1920
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-6:00 Chicago C%sT 1936 Mar 1 2:00
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-5:00 - EST 1936 Nov 15 2:00
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-6:00 Chicago C%sT 1942
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-6:00 US C%sT 1946
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-6:00 Chicago C%sT 1967
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-6:00 US C%sT
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# Oliver County, ND switched from mountain to central time on 1992-10-25.
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Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48
|
|
-7:00 US M%sT 1992 Oct 25 2:00
|
|
-6:00 US C%sT
|
|
# Morton County, ND, switched from mountain to central time on
|
|
# 2003-10-26, except for the area around Mandan which was already central time.
|
|
# See <http://dmses.dot.gov/docimages/p63/135818.pdf>.
|
|
# Officially this switch also included part of Sioux County, and
|
|
# Jones, Mellette, and Todd Counties in South Dakota;
|
|
# but in practice these other counties were already observing central time.
|
|
# See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>.
|
|
Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 12:14:21
|
|
-7:00 US M%sT 2003 Oct 26 2:00
|
|
-6:00 US C%sT
|
|
|
|
# From Josh Findley (2011-01-21):
|
|
# ...it appears that Mercer County, North Dakota, changed from the
|
|
# mountain time zone to the central time zone at the last transition from
|
|
# daylight-saving to standard time (on Nov. 7, 2010):
|
|
# https://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm
|
|
# http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html
|
|
|
|
# From Andy Lipscomb (2011-01-24):
|
|
# ...according to the Census Bureau, the largest city is Beulah (although
|
|
# it's commonly referred to as Beulah-Hazen, with Hazen being the next
|
|
# largest city in Mercer County). Google Maps places Beulah's city hall
|
|
# at 47° 15' 51" N, 101° 46' 40" W, which yields an offset of 6h47'07".
|
|
|
|
Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53
|
|
-7:00 US M%sT 2010 Nov 7 2:00
|
|
-6:00 US C%sT
|
|
|
|
# US mountain time, represented by Denver
|
|
#
|
|
# Colorado, far western Kansas, Montana, western
|
|
# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
|
|
# New Mexico, southwestern North Dakota,
|
|
# western South Dakota, far western Texas (El Paso County, Hudspeth County,
|
|
# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
|
|
#
|
|
# From Paul Eggert (2018-10-25):
|
|
# On 1921-03-04 federal law placed all of Texas into the central time zone.
|
|
# However, El Paso ignored the law for decades and continued to observe
|
|
# mountain time, on the grounds that that's what they had always done
|
|
# and they weren't about to let the federal government tell them what to do.
|
|
# Eventually the federal government gave in and changed the law on
|
|
# 1970-04-10 to match what El Paso was actually doing. Although
|
|
# that's slightly after our 1970 cutoff, there is no need to create a
|
|
# separate zone for El Paso since they were ignoring the law anyway. See:
|
|
# Long T. El Pasoans were time rebels, fought to stay in Mountain zone.
|
|
# El Paso Times. 2018-10-24 06:40 -06.
|
|
# https://www.elpasotimes.com/story/news/local/el-paso/2018/10/24/el-pasoans-were-time-rebels-fought-stay-mountain-zone/1744509002/
|
|
#
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
|
|
Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
|
|
Rule Denver 1920 only - Oct lastSun 2:00 0 S
|
|
Rule Denver 1921 only - May 22 2:00 0 S
|
|
Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
|
|
Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04
|
|
-7:00 US M%sT 1920
|
|
-7:00 Denver M%sT 1942
|
|
-7:00 US M%sT 1946
|
|
-7:00 Denver M%sT 1967
|
|
-7:00 US M%sT
|
|
|
|
# US Pacific time, represented by Los Angeles
|
|
#
|
|
# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater,
|
|
# Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties, Idaho county
|
|
# north of the Salmon River, and the towns of Burgdorf and Warren),
|
|
# Nevada (except West Wendover), Oregon (except the northern ¾ of
|
|
# Malheur county), and Washington
|
|
|
|
# From Paul Eggert (2016-08-20):
|
|
# In early February 1948, in response to California's electricity shortage,
|
|
# PG&E changed power frequency from 60 to 59.5 Hz during daylight hours,
|
|
# causing electric clocks to lose six minutes per day. (This did not change
|
|
# legal time, and is not part of the data here.) See:
|
|
# Ross SA. An energy crisis from the past: Northern California in 1948.
|
|
# Working Paper No. 8, Institute of Governmental Studies, UC Berkeley,
|
|
# 1973-11. https://escholarship.org/uc/item/8x22k30c
|
|
#
|
|
# In another measure to save electricity, DST was instituted from 1948-03-14
|
|
# at 02:01 to 1949-01-16 at 02:00, with the governor having the option to move
|
|
# the fallback transition earlier. See pages 3-4 of:
|
|
# http://clerk.assembly.ca.gov/sites/clerk.assembly.ca.gov/files/archive/Statutes/1948/48Vol1_Chapters.pdf
|
|
#
|
|
# In response:
|
|
#
|
|
# Governor Warren received a torrent of objecting mail, and it is not too much
|
|
# to speculate that the objections to Daylight Saving Time were one important
|
|
# factor in the defeat of the Dewey-Warren Presidential ticket in California.
|
|
# -- Ross, p 25
|
|
#
|
|
# On December 8 the governor exercised the option, setting the date to January 1
|
|
# (LA Times 1948-12-09). The transition time was 02:00 (LA Times 1949-01-01).
|
|
#
|
|
# Despite the controversy, in 1949 California voters approved Proposition 12,
|
|
# which established DST from April's last Sunday at 01:00 until September's
|
|
# last Sunday at 02:00. This was amended by 1962's Proposition 6, which changed
|
|
# the fall-back date to October's last Sunday. See:
|
|
# https://repository.uchastings.edu/cgi/viewcontent.cgi?article=1501&context=ca_ballot_props
|
|
# https://repository.uchastings.edu/cgi/viewcontent.cgi?article=1636&context=ca_ballot_props
|
|
#
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
|
|
Rule CA 1948 only - Mar 14 2:01 1:00 D
|
|
Rule CA 1949 only - Jan 1 2:00 0 S
|
|
Rule CA 1950 1966 - Apr lastSun 1:00 1:00 D
|
|
Rule CA 1950 1961 - Sep lastSun 2:00 0 S
|
|
Rule CA 1962 1966 - Oct lastSun 2:00 0 S
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02
|
|
-8:00 US P%sT 1946
|
|
-8:00 CA P%sT 1967
|
|
-8:00 US P%sT
|
|
|
|
# Alaska
|
|
# AK%sT is the modern abbreviation for -09 per USNO.
|
|
#
|
|
# From Paul Eggert (2017-06-15):
|
|
# Howse writes that Alaska switched from the Julian to the Gregorian calendar,
|
|
# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
|
|
# On Friday, 1867-10-18 (Gregorian), at precisely 15:30 local time, the
|
|
# Russian forts and fleet at Sitka fired salutes to mark the ceremony of
|
|
# formal transfer. See the Sacramento Daily Union (1867-11-14), p 3, col 2.
|
|
# https://cdnc.ucr.edu/cgi-bin/cdnc?a=d&d=SDU18671114.2.12.1
|
|
# Sitka workers did not change their calendars until Sunday, 1867-10-20,
|
|
# and so celebrated two Sundays that week. See: Ahllund T (tr Hallamaa P).
|
|
# From the memoirs of a Finnish workman. Alaska History. 2006 Fall;21(2):1-25.
|
|
# http://alaskahistoricalsociety.org/wp-content/uploads/2016/12/Ahllund-2006-Memoirs-of-a-Finnish-Workman.pdf
|
|
# Include only the time zone part of this transition, ignoring the switch
|
|
# from Julian to Gregorian, since we can't represent the Julian calendar.
|
|
#
|
|
# As far as we know, of the locations mentioned below only Sitka was
|
|
# permanently inhabited in 1867 by anyone using either calendar.
|
|
# (Yakutat was colonized by the Russians in 1799, but the settlement was
|
|
# destroyed in 1805 by a Yakutat-kon war party.) Many of Alaska's inhabitants
|
|
# were unaware of the US acquisition of Alaska, much less of any calendar or
|
|
# time change. However, the Russian-influenced part of Alaska did observe
|
|
# Russian time, and it is more accurate to model this than to ignore it.
|
|
# The database format requires an exact transition time; use the Russian
|
|
# salute as a somewhat-arbitrary time for the formal transfer of control for
|
|
# all of Alaska. Sitka's UTC offset is -9:01:13; adjust its 15:30 to the
|
|
# local times of other Alaskan locations so that they change simultaneously.
|
|
|
|
# From Paul Eggert (2014-07-18):
|
|
# One opinion of the early-1980s turmoil in Alaska over time zones and
|
|
# daylight saving time appeared as graffiti on a Juneau airport wall:
|
|
# "Welcome to Juneau. Please turn your watch back to the 19th century."
|
|
# See: Turner W. Alaska's four time zones now two. NY Times 1983-11-01.
|
|
# http://www.nytimes.com/1983/11/01/us/alaska-s-four-time-zones-now-two.html
|
|
#
|
|
# Steve Ferguson (2011-01-31) referred to the following source:
|
|
# Norris F. Keeping time in Alaska: national directives, local response.
|
|
# Alaska History 2001;16(1-2).
|
|
# http://alaskahistoricalsociety.org/discover-alaska/glimpses-of-the-past/keeping-time-in-alaska/
|
|
|
|
# From Arthur David Olson (2011-02-01):
|
|
# Here's database-relevant material from the 2001 "Alaska History" article:
|
|
#
|
|
# On September 20 [1979]...DOT...officials decreed that on April 27,
|
|
# 1980, Juneau and other nearby communities would move to Yukon Time.
|
|
# Sitka, Petersburg, Wrangell, and Ketchikan, however, would remain on
|
|
# Pacific Time.
|
|
#
|
|
# ...on September 22, 1980, DOT Secretary Neil E. Goldschmidt rescinded the
|
|
# Department's September 1979 decision. Juneau and other communities in
|
|
# northern Southeast reverted to Pacific Time on October 26.
|
|
#
|
|
# On October 28 [1983]...the Metlakatla Indian Community Council voted
|
|
# unanimously to keep the reservation on Pacific Time.
|
|
#
|
|
# According to DOT official Joanne Petrie, Indian reservations are not
|
|
# bound to follow time zones imposed by neighboring jurisdictions.
|
|
#
|
|
# (The last is consistent with how the database now handles the Navajo
|
|
# Nation.)
|
|
|
|
# From Arthur David Olson (2011-02-09):
|
|
# I just spoke by phone with a staff member at the Metlakatla Indian
|
|
# Community office (using contact information available at
|
|
# http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla
|
|
# It's shortly after 1:00 here on the east coast of the United States;
|
|
# the staffer said it was shortly after 10:00 there. When I asked whether
|
|
# that meant they were on Pacific time, they said no - they were on their
|
|
# own time. I asked about daylight saving; they said it wasn't used. I
|
|
# did not inquire about practices in the past.
|
|
|
|
# From Arthur David Olson (2011-08-17):
|
|
# For lack of better information, assume that Metlakatla's
|
|
# abandonment of use of daylight saving resulted from the 1983 vote.
|
|
|
|
# From Steffen Thorsen (2015-11-09):
|
|
# It seems Metlakatla did go off PST on Sunday, November 1, changing
|
|
# their time to AKST and are going to follow Alaska's DST, switching
|
|
# between AKST and AKDT from now on....
|
|
# https://www.krbd.org/2015/10/30/annette-island-times-they-are-a-changing/
|
|
|
|
# From Ryan Stanley (2018-11-06):
|
|
# The Metlakatla community in Alaska has decided not to change its
|
|
# clock back an hour starting on November 4th, 2018 (day before yesterday).
|
|
# They will be gmtoff=-28800 year-round.
|
|
# https://www.facebook.com/141055983004923/photos/pb.141055983004923.-2207520000.1541465673./569081370202380/
|
|
|
|
# From Paul Eggert (2018-12-16):
|
|
# In a 2018-12-11 special election, Metlakatla voted to go back to
|
|
# Alaska time (including daylight saving time) starting next year.
|
|
# https://www.krbd.org/2018/12/12/metlakatla-to-follow-alaska-standard-time-allow-liquor-sales/
|
|
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Juneau 15:02:19 - LMT 1867 Oct 19 15:33:32
|
|
-8:57:41 - LMT 1900 Aug 20 12:00
|
|
-8:00 - PST 1942
|
|
-8:00 US P%sT 1946
|
|
-8:00 - PST 1969
|
|
-8:00 US P%sT 1980 Apr 27 2:00
|
|
-9:00 US Y%sT 1980 Oct 26 2:00
|
|
-8:00 US P%sT 1983 Oct 30 2:00
|
|
-9:00 US Y%sT 1983 Nov 30
|
|
-9:00 US AK%sT
|
|
Zone America/Sitka 14:58:47 - LMT 1867 Oct 19 15:30
|
|
-9:01:13 - LMT 1900 Aug 20 12:00
|
|
-8:00 - PST 1942
|
|
-8:00 US P%sT 1946
|
|
-8:00 - PST 1969
|
|
-8:00 US P%sT 1983 Oct 30 2:00
|
|
-9:00 US Y%sT 1983 Nov 30
|
|
-9:00 US AK%sT
|
|
Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 19 15:44:55
|
|
-8:46:18 - LMT 1900 Aug 20 12:00
|
|
-8:00 - PST 1942
|
|
-8:00 US P%sT 1946
|
|
-8:00 - PST 1969
|
|
-8:00 US P%sT 1983 Oct 30 2:00
|
|
-8:00 - PST 2015 Nov 1 2:00
|
|
-9:00 US AK%sT 2018 Nov 4 2:00
|
|
-8:00 - PST 2019 Mar Sun>=8 3:00
|
|
-9:00 US AK%sT
|
|
Zone America/Yakutat 14:41:05 - LMT 1867 Oct 19 15:12:18
|
|
-9:18:55 - LMT 1900 Aug 20 12:00
|
|
-9:00 - YST 1942
|
|
-9:00 US Y%sT 1946
|
|
-9:00 - YST 1969
|
|
-9:00 US Y%sT 1983 Nov 30
|
|
-9:00 US AK%sT
|
|
Zone America/Anchorage 14:00:24 - LMT 1867 Oct 19 14:31:37
|
|
-9:59:36 - LMT 1900 Aug 20 12:00
|
|
-10:00 - AST 1942
|
|
-10:00 US A%sT 1967 Apr
|
|
-10:00 - AHST 1969
|
|
-10:00 US AH%sT 1983 Oct 30 2:00
|
|
-9:00 US Y%sT 1983 Nov 30
|
|
-9:00 US AK%sT
|
|
Zone America/Nome 12:58:22 - LMT 1867 Oct 19 13:29:35
|
|
-11:01:38 - LMT 1900 Aug 20 12:00
|
|
-11:00 - NST 1942
|
|
-11:00 US N%sT 1946
|
|
-11:00 - NST 1967 Apr
|
|
-11:00 - BST 1969
|
|
-11:00 US B%sT 1983 Oct 30 2:00
|
|
-9:00 US Y%sT 1983 Nov 30
|
|
-9:00 US AK%sT
|
|
Zone America/Adak 12:13:22 - LMT 1867 Oct 19 12:44:35
|
|
-11:46:38 - LMT 1900 Aug 20 12:00
|
|
-11:00 - NST 1942
|
|
-11:00 US N%sT 1946
|
|
-11:00 - NST 1967 Apr
|
|
-11:00 - BST 1969
|
|
-11:00 US B%sT 1983 Oct 30 2:00
|
|
-10:00 US AH%sT 1983 Nov 30
|
|
-10:00 US H%sT
|
|
# The following switches don't quite make our 1970 cutoff.
|
|
#
|
|
# Shanks writes that part of southwest Alaska (e.g. Aniak)
|
|
# switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
|
|
# and another part (e.g. Akiak) made the same switch five weeks later.
|
|
#
|
|
# From David Flater (2004-11-09):
|
|
# In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska
|
|
# Historic Preservation Commission, provided this information, which
|
|
# suggests that Unalaska deviated from statutory time from early 1967
|
|
# possibly until 1983:
|
|
#
|
|
# Minutes of the Unalaska City Council Meeting, January 10, 1967:
|
|
# "Except for St. Paul and Akutan, Unalaska is the only important
|
|
# location not on Alaska Standard Time. The following resolution was
|
|
# made by William Robinson and seconded by Henry Swanson: Be it
|
|
# resolved that the City of Unalaska hereby goes to Alaska Standard
|
|
# Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday,
|
|
# January 14, Alaska Standard Time.) This resolution was passed with
|
|
# three votes for and one against."
|
|
|
|
# Hawaii
|
|
|
|
# From Arthur David Olson (2010-12-09):
|
|
# "Hawaiian Time" by Robert C. Schmitt and Doak C. Cox appears on pages 207-225
|
|
# of volume 26 of The Hawaiian Journal of History (1992). As of 2010-12-09,
|
|
# the article is available at
|
|
# https://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf
|
|
# and indicates that standard time was adopted effective noon, January
|
|
# 13, 1896 (page 218), that in "1933, the Legislature decreed daylight
|
|
# saving for the period between the last Sunday of each April and the
|
|
# last Sunday of each September, but less than a month later repealed the
|
|
# act," (page 220), that year-round daylight saving time was in effect
|
|
# from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for
|
|
# when clocks changed) and that clocks were changed by 30 minutes
|
|
# effective the second Sunday of June, 1947 (page 219, with no time of
|
|
# day given for when clocks changed). A footnote for the 1933 changes
|
|
# cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933)
|
|
# and Act 163 (approved 21 May 1933)."
|
|
|
|
# From Arthur David Olson (2011-01-19):
|
|
# The following is from "Laws of the Territory of Hawaii Passed by the
|
|
# Seventeenth Legislature: Regular Session 1933," available (as of
|
|
# 2011-01-19) at American University's Pence Law Library. Page 85: "Act
|
|
# 90...At 2 o'clock ante meridian of the last Sunday in April of each
|
|
# year, the standard time of this Territory shall be advanced one
|
|
# hour...This Act shall take effect upon its approval. Approved this 26th
|
|
# day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of
|
|
# Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is
|
|
# hereby repealed...This Act shall take effect upon its approval, upon
|
|
# which date the standard time of this Territory shall be restored to
|
|
# that existing immediately prior to the taking effect of said Act 90.
|
|
# Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor
|
|
# of the Territory of Hawaii."
|
|
#
|
|
# Note that 1933-05-21 was a Sunday.
|
|
# We're left to guess the time of day when Act 163 was approved; guess noon.
|
|
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00
|
|
-10:30 - HST 1933 Apr 30 2:00
|
|
-10:30 1:00 HDT 1933 May 21 12:00
|
|
-10:30 US H%sT 1947 Jun 8 2:00
|
|
-10:00 - HST
|
|
|
|
# Now we turn to US areas that have diverged from the consensus since 1970.
|
|
|
|
# Arizona mostly uses MST.
|
|
|
|
# From Paul Eggert (2002-10-20):
|
|
#
|
|
# The information in the rest of this paragraph is derived from the
|
|
# Daylight Saving Time web page
|
|
# <http://www.dlapr.lib.az.us/links/daylight.htm> (2002-01-23)
|
|
# maintained by the Arizona State Library, Archives and Public Records.
|
|
# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
|
|
# time, but by federal law railroads, airlines, bus lines, military
|
|
# personnel, and some engaged in interstate commerce continued to
|
|
# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix
|
|
# Gazette says that was the date the law changed, and that 04-01 was
|
|
# the date the state's clocks would change. In 1945 the State of
|
|
# Arizona used standard time all year, again with exceptions only as
|
|
# mandated by federal law. Arizona observed DST in 1967, but Arizona
|
|
# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.
|
|
#
|
|
# Shanks says the 1944 experiment came to an end on 1944-03-17.
|
|
# Go with the Arizona State Library instead.
|
|
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42
|
|
-7:00 US M%sT 1944 Jan 1 0:01
|
|
-7:00 - MST 1944 Apr 1 0:01
|
|
-7:00 US M%sT 1944 Oct 1 0:01
|
|
-7:00 - MST 1967
|
|
-7:00 US M%sT 1968 Mar 21
|
|
-7:00 - MST
|
|
# From Arthur David Olson (1988-02-13):
|
|
# A writer from the Inter Tribal Council of Arizona, Inc.,
|
|
# notes in private correspondence dated 1987-12-28 that "Presently, only the
|
|
# Navajo Nation participates in the Daylight Saving Time policy, due to its
|
|
# large size and location in three states." (The "only" means that other
|
|
# tribal nations don't use DST.)
|
|
#
|
|
# From Paul Eggert (2013-08-26):
|
|
# See America/Denver for a zone appropriate for the Navajo Nation.
|
|
|
|
# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
|
|
# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
|
|
# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,
|
|
# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
|
|
# Teton, Twin Falls, Valley, Washington counties, and the southern
|
|
# quarter of Idaho county) and eastern Oregon (most of Malheur County)
|
|
# switched four weeks late in 1974.
|
|
#
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11
|
|
-8:00 US P%sT 1923 May 13 2:00
|
|
-7:00 US M%sT 1974
|
|
-7:00 - MST 1974 Feb 3 2:00
|
|
-7:00 US M%sT
|
|
|
|
# Indiana
|
|
#
|
|
# For a map of Indiana's time zone regions, see:
|
|
# https://en.wikipedia.org/wiki/Time_in_Indiana
|
|
#
|
|
# From Paul Eggert (2018-11-30):
|
|
# A brief but entertaining history of time in Indiana describes a 1949 debate
|
|
# in the Indiana House where city legislators (who favored "fast time")
|
|
# tussled with farm legislators (who didn't) over a bill to outlaw DST:
|
|
# "Lacking enough votes, the city faction tries to filibuster until time runs
|
|
# out on the session at midnight, but rural champion Rep. Herbert Copeland,
|
|
# R-Madison, leans over the gallery railing and forces the official clock
|
|
# back to 9 p.m., breaking it in the process. The clock sticks on 9 as the
|
|
# debate rages on into the night. The filibuster finally dies out and the
|
|
# bill passes, while outside the chamber, clocks read 3:30 a.m. In the end,
|
|
# it doesn't matter which side won. The law has no enforcement powers and
|
|
# is simply ignored by fast-time communities."
|
|
# How Indiana went from 'God's time' to split zones and daylight-saving.
|
|
# Indianapolis Star. 2018-11-27 14:58 -05.
|
|
# https://www.indystar.com/story/news/politics/2018/11/27/indianapolis-indiana-time-zone-history-central-eastern-daylight-savings-time/2126300002/
|
|
#
|
|
# From Paul Eggert (2007-08-17):
|
|
# Since 1970, most of Indiana has been like America/Indiana/Indianapolis,
|
|
# with the following exceptions:
|
|
#
|
|
# - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
|
|
# Vanderburgh, and Warrick counties have been like America/Chicago.
|
|
#
|
|
# - Dearborn and Ohio counties have been like America/New_York.
|
|
#
|
|
# - Clark, Floyd, and Harrison counties have been like
|
|
# America/Kentucky/Louisville.
|
|
#
|
|
# - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke,
|
|
# and Switzerland counties have their own time zone histories as noted below.
|
|
#
|
|
# Shanks partitioned Indiana into 345 regions, each with its own time history,
|
|
# and wrote "Even newspaper reports present contradictory information."
|
|
# Those Hoosiers! Such a flighty and changeable people!
|
|
# Fortunately, most of the complexity occurred before our cutoff date of 1970.
|
|
#
|
|
# Other than Indianapolis, the Indiana place names are so nondescript
|
|
# that they would be ambiguous if we left them at the 'America' level.
|
|
# So we reluctantly put them all in a subdirectory 'America/Indiana'.
|
|
|
|
# From Paul Eggert (2014-06-26):
|
|
# https://www.federalregister.gov/articles/2006/01/20/06-563/standard-time-zone-boundary-in-the-state-of-indiana
|
|
# says "DOT is relocating the time zone boundary in Indiana to move Starke,
|
|
# Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the
|
|
# Eastern Time Zone to the Central Time Zone.... The effective date of
|
|
# this rule is 2 a.m. EST Sunday, April 2, 2006, which is the
|
|
# changeover date from standard time to Daylight Saving Time."
|
|
# Strictly speaking, this meant the affected counties changed their
|
|
# clocks twice that night, but this obviously was in error. The intent
|
|
# was that 01:59:59 EST be followed by 02:00:00 CDT.
|
|
|
|
# From Gwillim Law (2007-02-10):
|
|
# The Associated Press has been reporting that Pulaski County, Indiana is
|
|
# going to switch from Central to Eastern Time on March 11, 2007....
|
|
# http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL
|
|
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
|
|
Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
|
|
Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
|
|
Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22
|
|
-6:00 US C%sT 1920
|
|
-6:00 Indianapolis C%sT 1942
|
|
-6:00 US C%sT 1946
|
|
-6:00 Indianapolis C%sT 1955 Apr 24 2:00
|
|
-5:00 - EST 1957 Sep 29 2:00
|
|
-6:00 - CST 1958 Apr 27 2:00
|
|
-5:00 - EST 1969
|
|
-5:00 US E%sT 1971
|
|
-5:00 - EST 2006
|
|
-5:00 US E%sT
|
|
#
|
|
# Eastern Crawford County, Indiana, left its clocks alone in 1974,
|
|
# as well as from 1976 through 2005.
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
|
|
Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D
|
|
Rule Marengo 1951 only - Sep lastSun 2:00 0 S
|
|
Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
|
|
Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37
|
|
-6:00 US C%sT 1951
|
|
-6:00 Marengo C%sT 1961 Apr 30 2:00
|
|
-5:00 - EST 1969
|
|
-5:00 US E%sT 1974 Jan 6 2:00
|
|
-6:00 1:00 CDT 1974 Oct 27 2:00
|
|
-5:00 US E%sT 1976
|
|
-5:00 - EST 2006
|
|
-5:00 US E%sT
|
|
#
|
|
# Daviess, Dubois, Knox, and Martin Counties, Indiana,
|
|
# switched from eastern to central time in April 2006, then switched back
|
|
# in November 2007.
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
|
|
Rule Vincennes 1946 only - Apr lastSun 2:00 1:00 D
|
|
Rule Vincennes 1946 only - Sep lastSun 2:00 0 S
|
|
Rule Vincennes 1953 1954 - Apr lastSun 2:00 1:00 D
|
|
Rule Vincennes 1953 1959 - Sep lastSun 2:00 0 S
|
|
Rule Vincennes 1955 only - May 1 0:00 1:00 D
|
|
Rule Vincennes 1956 1963 - Apr lastSun 2:00 1:00 D
|
|
Rule Vincennes 1960 only - Oct lastSun 2:00 0 S
|
|
Rule Vincennes 1961 only - Sep lastSun 2:00 0 S
|
|
Rule Vincennes 1962 1963 - Oct lastSun 2:00 0 S
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Indiana/Vincennes -5:50:07 - LMT 1883 Nov 18 12:09:53
|
|
-6:00 US C%sT 1946
|
|
-6:00 Vincennes C%sT 1964 Apr 26 2:00
|
|
-5:00 - EST 1969
|
|
-5:00 US E%sT 1971
|
|
-5:00 - EST 2006 Apr 2 2:00
|
|
-6:00 US C%sT 2007 Nov 4 2:00
|
|
-5:00 US E%sT
|
|
#
|
|
# Perry County, Indiana, switched from eastern to central time in April 2006.
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
|
|
Rule Perry 1946 only - Apr lastSun 2:00 1:00 D
|
|
Rule Perry 1946 only - Sep lastSun 2:00 0 S
|
|
Rule Perry 1953 1954 - Apr lastSun 2:00 1:00 D
|
|
Rule Perry 1953 1959 - Sep lastSun 2:00 0 S
|
|
Rule Perry 1955 only - May 1 0:00 1:00 D
|
|
Rule Perry 1956 1963 - Apr lastSun 2:00 1:00 D
|
|
Rule Perry 1960 only - Oct lastSun 2:00 0 S
|
|
Rule Perry 1961 only - Sep lastSun 2:00 0 S
|
|
Rule Perry 1962 1963 - Oct lastSun 2:00 0 S
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Indiana/Tell_City -5:47:03 - LMT 1883 Nov 18 12:12:57
|
|
-6:00 US C%sT 1946
|
|
-6:00 Perry C%sT 1964 Apr 26 2:00
|
|
-5:00 - EST 1969
|
|
-5:00 US E%sT 1971
|
|
-5:00 - EST 2006 Apr 2 2:00
|
|
-6:00 US C%sT
|
|
#
|
|
# Pike County, Indiana moved from central to eastern time in 1977,
|
|
# then switched back in 2006, then switched back again in 2007.
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
|
|
Rule Pike 1955 only - May 1 0:00 1:00 D
|
|
Rule Pike 1955 1960 - Sep lastSun 2:00 0 S
|
|
Rule Pike 1956 1964 - Apr lastSun 2:00 1:00 D
|
|
Rule Pike 1961 1964 - Oct lastSun 2:00 0 S
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Indiana/Petersburg -5:49:07 - LMT 1883 Nov 18 12:10:53
|
|
-6:00 US C%sT 1955
|
|
-6:00 Pike C%sT 1965 Apr 25 2:00
|
|
-5:00 - EST 1966 Oct 30 2:00
|
|
-6:00 US C%sT 1977 Oct 30 2:00
|
|
-5:00 - EST 2006 Apr 2 2:00
|
|
-6:00 US C%sT 2007 Nov 4 2:00
|
|
-5:00 US E%sT
|
|
#
|
|
# Starke County, Indiana moved from central to eastern time in 1991,
|
|
# then switched back in 2006.
|
|
# From Arthur David Olson (1991-10-28):
|
|
# An article on page A3 of the Sunday, 1991-10-27 Washington Post
|
|
# notes that Starke County switched from Central time to Eastern time as of
|
|
# 1991-10-27.
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
|
|
Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
|
|
Rule Starke 1947 1954 - Sep lastSun 2:00 0 S
|
|
Rule Starke 1955 1956 - Oct lastSun 2:00 0 S
|
|
Rule Starke 1957 1958 - Sep lastSun 2:00 0 S
|
|
Rule Starke 1959 1961 - Oct lastSun 2:00 0 S
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30
|
|
-6:00 US C%sT 1947
|
|
-6:00 Starke C%sT 1962 Apr 29 2:00
|
|
-5:00 - EST 1963 Oct 27 2:00
|
|
-6:00 US C%sT 1991 Oct 27 2:00
|
|
-5:00 - EST 2006 Apr 2 2:00
|
|
-6:00 US C%sT
|
|
#
|
|
# Pulaski County, Indiana, switched from eastern to central time in
|
|
# April 2006 and then switched back in March 2007.
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
|
|
Rule Pulaski 1946 1960 - Apr lastSun 2:00 1:00 D
|
|
Rule Pulaski 1946 1954 - Sep lastSun 2:00 0 S
|
|
Rule Pulaski 1955 1956 - Oct lastSun 2:00 0 S
|
|
Rule Pulaski 1957 1960 - Sep lastSun 2:00 0 S
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Indiana/Winamac -5:46:25 - LMT 1883 Nov 18 12:13:35
|
|
-6:00 US C%sT 1946
|
|
-6:00 Pulaski C%sT 1961 Apr 30 2:00
|
|
-5:00 - EST 1969
|
|
-5:00 US E%sT 1971
|
|
-5:00 - EST 2006 Apr 2 2:00
|
|
-6:00 US C%sT 2007 Mar 11 2:00
|
|
-5:00 US E%sT
|
|
#
|
|
# Switzerland County, Indiana, did not observe DST from 1973 through 2005.
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44
|
|
-6:00 US C%sT 1954 Apr 25 2:00
|
|
-5:00 - EST 1969
|
|
-5:00 US E%sT 1973
|
|
-5:00 - EST 2006
|
|
-5:00 US E%sT
|
|
|
|
# From Paul Eggert (2018-03-20):
|
|
# The Louisville & Nashville Railroad's 1883-11-18 change occurred at
|
|
# 10:00 old local time; train were supposed to come to a standstill
|
|
# for precisely 18 minutes. See Bartky Fig. 1 (page 50). It is not
|
|
# clear how this matched civil time in Louisville, so for now continue
|
|
# to assume Louisville switched at noon new local time, like New York.
|
|
#
|
|
# Part of Kentucky left its clocks alone in 1974.
|
|
# This also includes Clark, Floyd, and Harrison counties in Indiana.
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
|
|
Rule Louisville 1921 only - May 1 2:00 1:00 D
|
|
Rule Louisville 1921 only - Sep 1 2:00 0 S
|
|
Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
|
|
Rule Louisville 1941 only - Sep lastSun 2:00 0 S
|
|
Rule Louisville 1946 only - Jun 2 2:00 0 S
|
|
Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
|
|
Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58
|
|
-6:00 US C%sT 1921
|
|
-6:00 Louisville C%sT 1942
|
|
-6:00 US C%sT 1946
|
|
-6:00 Louisville C%sT 1961 Jul 23 2:00
|
|
-5:00 - EST 1968
|
|
-5:00 US E%sT 1974 Jan 6 2:00
|
|
-6:00 1:00 CDT 1974 Oct 27 2:00
|
|
-5:00 US E%sT
|
|
#
|
|
# Wayne County, Kentucky
|
|
#
|
|
# From Lake Cumberland LIFE
|
|
# http://www.lake-cumberland.com/life/archive/news990129time.shtml
|
|
# (1999-01-29) via WKYM-101.7:
|
|
# Clinton County has joined Wayne County in asking the DoT to change from
|
|
# the Central to the Eastern time zone.... The Wayne County government made
|
|
# the same request in December. And while Russell County officials have not
|
|
# taken action, the majority of respondents to a poll conducted there in
|
|
# August indicated they would like to change to "fast time" also.
|
|
# The three Lake Cumberland counties are the farthest east of any U.S.
|
|
# location in the Central time zone.
|
|
#
|
|
# From Rich Wales (2000-08-29):
|
|
# After prolonged debate, and despite continuing deep differences of opinion,
|
|
# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
|
|
# (-0500) time. They won't "fall back" this year. See Sara Shipley,
|
|
# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
|
|
#
|
|
# From Paul Eggert (2001-07-16):
|
|
# The final rule was published in the
|
|
# Federal Register 65, 160 (2000-08-17), pp 50154-50158.
|
|
# https://www.gpo.gov/fdsys/pkg/FR-2000-08-17/html/00-20854.htm
|
|
#
|
|
Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36
|
|
-6:00 US C%sT 1946
|
|
-6:00 - CST 1968
|
|
-6:00 US C%sT 2000 Oct 29 2:00
|
|
-5:00 US E%sT
|
|
|
|
|
|
# From Rives McDow (2000-08-30):
|
|
# Here ... are all the changes in the US since 1985.
|
|
# Kearny County, KS (put all of county on central;
|
|
# previously split between MST and CST) ... 1990-10
|
|
# Starke County, IN (from CST to EST) ... 1991-10
|
|
# Oliver County, ND (from MST to CST) ... 1992-10
|
|
# West Wendover, NV (from PST TO MST) ... 1999-10
|
|
# Wayne County, KY (from CST to EST) ... 2000-10
|
|
#
|
|
# From Paul Eggert (2001-07-17):
|
|
# We don't know where the line used to be within Kearny County, KS,
|
|
# so omit that change for now.
|
|
# See America/Indiana/Knox for the Starke County, IN change.
|
|
# See America/North_Dakota/Center for the Oliver County, ND change.
|
|
# West Wendover, NV officially switched from Pacific to mountain time on
|
|
# 1999-10-31. See the
|
|
# Federal Register 64, 203 (1999-10-21), pp 56705-56707.
|
|
# https://www.gpo.gov/fdsys/pkg/FR-1999-10-21/html/99-27240.htm
|
|
# However, the Federal Register says that West Wendover already operated
|
|
# on mountain time, and the rule merely made this official;
|
|
# hence a separate tz entry is not needed.
|
|
|
|
# Michigan
|
|
#
|
|
# From Bob Devine (1988-01-28):
|
|
# Michigan didn't observe DST from 1968 to 1973.
|
|
#
|
|
# From Paul Eggert (1999-03-31):
|
|
# Shanks writes that Michigan started using standard time on 1885-09-18,
|
|
# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
|
|
# that Detroit kept
|
|
#
|
|
# local time until 1900 when the City Council decreed that clocks should
|
|
# be put back twenty-eight minutes to Central Standard Time. Half the
|
|
# city obeyed, half refused. After considerable debate, the decision
|
|
# was rescinded and the city reverted to Sun time. A derisive offer to
|
|
# erect a sundial in front of the city hall was referred to the
|
|
# Committee on Sewers. Then, in 1905, Central time was adopted
|
|
# by city vote.
|
|
#
|
|
# This story is too entertaining to be false, so go with Howse over Shanks.
|
|
#
|
|
# From Paul Eggert (2001-03-06):
|
|
# Garland (1927) writes "Cleveland and Detroit advanced their clocks
|
|
# one hour in 1914." This change is not in Shanks. We have no more
|
|
# info, so omit this for now.
|
|
#
|
|
# From Paul Eggert (2017-07-26):
|
|
# Although Shanks says Detroit observed DST in 1967 from 06-14 00:01
|
|
# until 10-29 00:01, I now see multiple reports that this is incorrect.
|
|
# For example, according to a 50-year anniversary report about the 1967
|
|
# Detroit riots and a major-league doubleheader on 1967-07-23, "By the time
|
|
# the last fly ball of the doubleheader settled into the glove of leftfielder
|
|
# Lenny Green, it was after 7 p.m. Detroit did not observe daylight saving
|
|
# time, so light was already starting to fail. Twilight was made even deeper
|
|
# by billowing columns of smoke that ascended in an unbroken wall north of the
|
|
# ballpark." See: Dow B. Detroit '67: As violence unfolded, Tigers played two
|
|
# at home vs. Yankees. Detroit Free Press 2017-07-23.
|
|
# https://www.freep.com/story/sports/mlb/tigers/2017/07/23/detroit-tigers-1967-riot-new-york-yankees/499951001/
|
|
#
|
|
# Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
|
|
Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
|
|
Rule Detroit 1948 only - Sep lastSun 2:00 0 S
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Detroit -5:32:11 - LMT 1905
|
|
-6:00 - CST 1915 May 15 2:00
|
|
-5:00 - EST 1942
|
|
-5:00 US E%sT 1946
|
|
-5:00 Detroit E%sT 1973
|
|
-5:00 US E%sT 1975
|
|
-5:00 - EST 1975 Apr 27 2:00
|
|
-5:00 US E%sT
|
|
#
|
|
# Dickinson, Gogebic, Iron, and Menominee Counties, Michigan,
|
|
# switched from EST to CST/CDT in 1973.
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
|
|
Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
|
|
Rule Menominee 1946 only - Sep lastSun 2:00 0 S
|
|
Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
|
|
Rule Menominee 1966 only - Oct lastSun 2:00 0 S
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
|
|
-6:00 US C%sT 1946
|
|
-6:00 Menominee C%sT 1969 Apr 27 2:00
|
|
-5:00 - EST 1973 Apr 29 2:00
|
|
-6:00 US C%sT
|
|
|
|
# Navassa
|
|
# administered by the US Fish and Wildlife Service
|
|
# claimed by US under the provisions of the 1856 Guano Islands Act
|
|
# also claimed by Haiti
|
|
# occupied 1857/1900 by the Navassa Phosphate Co
|
|
# US lighthouse 1917/1996-09
|
|
# currently uninhabited
|
|
# see Mark Fineman, "An Isle Rich in Guano and Discord",
|
|
# _Los Angeles Times_ (1998-11-10), A1, A10; it cites
|
|
# Jimmy Skaggs, _The Great Guano Rush_ (1994).
|
|
|
|
################################################################################
|
|
|
|
|
|
# From Paul Eggert (2017-02-10):
|
|
#
|
|
# Unless otherwise specified, the source for data through 1990 is:
|
|
# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
|
|
# San Diego: ACS Publications, Inc. (2003).
|
|
# Unfortunately this book contains many errors and cites no sources.
|
|
#
|
|
# Many years ago Gwillim Law wrote that a good source
|
|
# for time zone data was the International Air Transport
|
|
# Association's Standard Schedules Information Manual (IATA SSIM),
|
|
# published semiannually. Law sent in several helpful summaries
|
|
# of the IATA's data after 1990. Except where otherwise noted,
|
|
# IATA SSIM is the source for entries after 1990.
|
|
#
|
|
# Other sources occasionally used include:
|
|
#
|
|
# Edward W. Whitman, World Time Differences,
|
|
# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
|
|
# which I found in the UCLA library.
|
|
#
|
|
# William Willett, The Waste of Daylight, 19th edition
|
|
# <http://cs.ucla.edu/~eggert/The-Waste-of-Daylight-19th.pdf>
|
|
# [PDF] (1914-03)
|
|
#
|
|
# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
|
|
# <https://www.jstor.org/stable/1774359>.
|
|
#
|
|
# See the 'europe' file for Greenland.
|
|
|
|
# Canada
|
|
|
|
# From Alain LaBonté (1994-11-14):
|
|
# I post here the time zone abbreviations standardized in Canada
|
|
# for both English and French in the CAN/CSA-Z234.4-89 standard....
|
|
#
|
|
# UTC Standard time Daylight saving time
|
|
# offset French English French English
|
|
# -2:30 - - HAT NDT
|
|
# -3 - - HAA ADT
|
|
# -3:30 HNT NST - -
|
|
# -4 HNA AST HAE EDT
|
|
# -5 HNE EST HAC CDT
|
|
# -6 HNC CST HAR MDT
|
|
# -7 HNR MST HAP PDT
|
|
# -8 HNP PST HAY YDT
|
|
# -9 HNY YST - -
|
|
#
|
|
# HN: Heure Normale ST: Standard Time
|
|
# HA: Heure Avancée DT: Daylight saving Time
|
|
#
|
|
# A: de l'Atlantique Atlantic
|
|
# C: du Centre Central
|
|
# E: de l'Est Eastern
|
|
# M: Mountain
|
|
# N: Newfoundland
|
|
# P: du Pacifique Pacific
|
|
# R: des Rocheuses
|
|
# T: de Terre-Neuve
|
|
# Y: du Yukon Yukon
|
|
#
|
|
# From Paul Eggert (1994-11-22):
|
|
# Alas, this sort of thing must be handled by localization software.
|
|
|
|
# Unless otherwise specified, the data entries for Canada are all from Shanks
|
|
# & Pottenger.
|
|
|
|
# From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31,
|
|
# 2007-03-01):
|
|
# The British Columbia government announced yesterday that it will
|
|
# adjust daylight savings next year to align with changes in the
|
|
# U.S. and the rest of Canada....
|
|
# https://archive.news.gov.bc.ca/releases/news_releases_2005-2009/2006AG0014-000330.htm
|
|
# ...
|
|
# Nova Scotia
|
|
# Daylight saving time will be extended by four weeks starting in 2007....
|
|
# https://www.novascotia.ca/just/regulations/rg2/2006/ma1206.pdf
|
|
#
|
|
# [For New Brunswick] the new legislation dictates that the time change is to
|
|
# be done at 02:00 instead of 00:01.
|
|
# https://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf
|
|
# ...
|
|
# Manitoba has traditionally changed the clock every fall at 03:00.
|
|
# As of 2006, the transition is to take place one hour earlier at 02:00.
|
|
# https://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php
|
|
# ...
|
|
# [Alberta, Ontario, Quebec] will follow US rules.
|
|
# http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM
|
|
# http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm
|
|
# http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF
|
|
# ...
|
|
# P.E.I. will follow US rules....
|
|
# http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf
|
|
# ...
|
|
# Province of Newfoundland and Labrador....
|
|
# http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm
|
|
# ...
|
|
# Yukon
|
|
# https://www.gov.yk.ca/legislation/regs/oic2006_127.pdf
|
|
# ...
|
|
# N.W.T. will follow US rules. Whoever maintains the government web site
|
|
# does not seem to believe in bookmarks. To see the news release, click the
|
|
# following link and search for "Daylight Savings Time Change". Press the
|
|
# "Daylight Savings Time Change" link; it will fire off a popup using
|
|
# JavaScript.
|
|
# http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive
|
|
# ...
|
|
# Nunavut
|
|
# An amendment to the Interpretation Act was registered on February 19/2007....
|
|
# http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf
|
|
|
|
# From Paul Eggert (2014-10-18):
|
|
# H. David Matthews and Mary Vincent's map
|
|
# "It's about TIME", _Canadian Geographic_ (September-October 1998)
|
|
# http://www.canadiangeographic.ca/Magazine/SO98/alacarte.asp
|
|
# contains detailed boundaries for regions observing nonstandard
|
|
# time and daylight saving time arrangements in Canada circa 1998.
|
|
#
|
|
# National Research Council Canada maintains info about time zones and DST.
|
|
# https://www.nrc-cnrc.gc.ca/eng/services/time/time_zones.html
|
|
# https://www.nrc-cnrc.gc.ca/eng/services/time/faq/index.html#Q5
|
|
# Its unofficial information is often taken from Matthews and Vincent.
|
|
|
|
# From Paul Eggert (2006-06-27):
|
|
# For now, assume all of DST-observing Canada will fall into line with the
|
|
# new US DST rules,
|
|
|
|
# From Chris Walton (2011-12-01)
|
|
# In the first of Tammy Hardwick's articles
|
|
# http://www.ilovecreston.com/?p=articles&t=spec&ar=260
|
|
# she quotes the Friday November 1/1918 edition of the Creston Review.
|
|
# The quote includes these two statements:
|
|
# 'Sunday the CPR went back to the old system of time...'
|
|
# '... The daylight saving scheme was dropped all over Canada at the same time,'
|
|
# These statements refer to a transition from daylight time to standard time
|
|
# that occurred nationally on Sunday October 27/1918. This transition was
|
|
# also documented in the Saturday October 26/1918 edition of the Toronto Star.
|
|
|
|
# In light of that evidence, we alter the date from the earlier believed
|
|
# Oct 31, to Oct 27, 1918 (and Sunday is a more likely transition day
|
|
# than Thursday) in all Canadian rulesets.
|
|
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
|
|
Rule Canada 1918 only - Apr 14 2:00 1:00 D
|
|
Rule Canada 1918 only - Oct 27 2:00 0 S
|
|
Rule Canada 1942 only - Feb 9 2:00 1:00 W # War
|
|
Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace
|
|
Rule Canada 1945 only - Sep 30 2:00 0 S
|
|
Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
|
|
Rule Canada 1974 2006 - Oct lastSun 2:00 0 S
|
|
Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D
|
|
Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D
|
|
Rule Canada 2007 max - Nov Sun>=1 2:00 0 S
|
|
|
|
|
|
# Newfoundland and Labrador
|
|
|
|
# From Paul Eggert (2017-10-14):
|
|
# Legally Labrador should observe Newfoundland time; see:
|
|
# McLeod J. Labrador time - legal or not? St. John's Telegram, 2017-10-07
|
|
# http://www.thetelegram.com/news/local/labrador-time--legal-or-not-154860/
|
|
# Matthews and Vincent (1998) write that the only part of Labrador
|
|
# that follows the rules is the southeast corner, including Port Hope
|
|
# Simpson and Mary's Harbour, but excluding, say, Black Tickle.
|
|
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
|
|
Rule StJohns 1917 only - Apr 8 2:00 1:00 D
|
|
Rule StJohns 1917 only - Sep 17 2:00 0 S
|
|
# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger.
|
|
Rule StJohns 1919 only - May 5 23:00 1:00 D
|
|
Rule StJohns 1919 only - Aug 12 23:00 0 S
|
|
# For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger.
|
|
Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
|
|
Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
|
|
# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks &
|
|
# Pottenger.
|
|
Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D
|
|
Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S
|
|
# Whitman gives the following transitions:
|
|
# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07
|
|
# but go with Shanks & Pottenger and assume they used Canadian rules.
|
|
# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
|
|
# Apr 30 - Sep 24; go with Shanks & Pottenger.
|
|
Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
|
|
Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
|
|
Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
|
|
Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
|
|
Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S
|
|
# From Paul Eggert (2000-10-02):
|
|
# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches
|
|
# at 00:01 local time. For now, assume it started in 1987.
|
|
|
|
# From Michael Pelley (2011-09-12):
|
|
# We received today, Monday, September 12, 2011, notification that the
|
|
# changes to the Newfoundland Standard Time Act have been proclaimed.
|
|
# The change in the Act stipulates that the change from Daylight Savings
|
|
# Time to Standard Time and from Standard Time to Daylight Savings Time
|
|
# now occurs at 2:00AM.
|
|
# ...
|
|
# http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm
|
|
# ...
|
|
# MICHAEL PELLEY | Manager of Enterprise Architecture - Solution Delivery
|
|
# Office of the Chief Information Officer
|
|
# Executive Council
|
|
# Government of Newfoundland & Labrador
|
|
|
|
Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D
|
|
Rule StJohns 1987 2006 - Oct lastSun 0:01 0 S
|
|
Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD
|
|
Rule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D
|
|
Rule StJohns 2007 2011 - Mar Sun>=8 0:01 1:00 D
|
|
Rule StJohns 2007 2010 - Nov Sun>=1 0:01 0 S
|
|
#
|
|
# St John's has an apostrophe, but Posix file names can't have apostrophes.
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/St_Johns -3:30:52 - LMT 1884
|
|
-3:30:52 StJohns N%sT 1918
|
|
-3:30:52 Canada N%sT 1919
|
|
-3:30:52 StJohns N%sT 1935 Mar 30
|
|
-3:30 StJohns N%sT 1942 May 11
|
|
-3:30 Canada N%sT 1946
|
|
-3:30 StJohns N%sT 2011 Nov
|
|
-3:30 Canada N%sT
|
|
|
|
# most of east Labrador
|
|
|
|
# The name 'Happy Valley-Goose Bay' is too long; use 'Goose Bay'.
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
|
|
-3:30:52 - NST 1918
|
|
-3:30:52 Canada N%sT 1919
|
|
-3:30:52 - NST 1935 Mar 30
|
|
-3:30 - NST 1936
|
|
-3:30 StJohns N%sT 1942 May 11
|
|
-3:30 Canada N%sT 1946
|
|
-3:30 StJohns N%sT 1966 Mar 15 2:00
|
|
-4:00 StJohns A%sT 2011 Nov
|
|
-4:00 Canada A%sT
|
|
|
|
|
|
# west Labrador, Nova Scotia, Prince Edward I
|
|
|
|
# From Brian Inglis (2015-07-20):
|
|
# From the historical weather station records available at:
|
|
# https://weatherspark.com/history/28351/1971/Sydney-Nova-Scotia-Canada
|
|
# Sydney shares the same time history as Glace Bay, so was
|
|
# likely to be the same across the island....
|
|
# Sydney, as the capital and most populous location, or Cape Breton, would
|
|
# have been better names for the zone had we known this in 1996.
|
|
|
|
# From Paul Eggert (2015-07-20):
|
|
# Shanks & Pottenger write that since 1970 most of this region has been like
|
|
# Halifax. Many locales did not observe peacetime DST until 1972;
|
|
# the Cape Breton area, represented by Glace Bay, is the largest we know of
|
|
# (Glace Bay was perhaps not the best name choice but no point changing now).
|
|
# Shanks & Pottenger also write that Liverpool, NS was the only town
|
|
# in Canada to observe DST in 1971 but not 1970; for now we'll assume
|
|
# this is a typo.
|
|
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
|
|
Rule Halifax 1916 only - Apr 1 0:00 1:00 D
|
|
Rule Halifax 1916 only - Oct 1 0:00 0 S
|
|
Rule Halifax 1920 only - May 9 0:00 1:00 D
|
|
Rule Halifax 1920 only - Aug 29 0:00 0 S
|
|
Rule Halifax 1921 only - May 6 0:00 1:00 D
|
|
Rule Halifax 1921 1922 - Sep 5 0:00 0 S
|
|
Rule Halifax 1922 only - Apr 30 0:00 1:00 D
|
|
Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
|
|
Rule Halifax 1923 only - Sep 4 0:00 0 S
|
|
Rule Halifax 1924 only - Sep 15 0:00 0 S
|
|
Rule Halifax 1925 only - Sep 28 0:00 0 S
|
|
Rule Halifax 1926 only - May 16 0:00 1:00 D
|
|
Rule Halifax 1926 only - Sep 13 0:00 0 S
|
|
Rule Halifax 1927 only - May 1 0:00 1:00 D
|
|
Rule Halifax 1927 only - Sep 26 0:00 0 S
|
|
Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
|
|
Rule Halifax 1928 only - Sep 9 0:00 0 S
|
|
Rule Halifax 1929 only - Sep 3 0:00 0 S
|
|
Rule Halifax 1930 only - Sep 15 0:00 0 S
|
|
Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
|
|
Rule Halifax 1932 only - May 1 0:00 1:00 D
|
|
Rule Halifax 1933 only - Apr 30 0:00 1:00 D
|
|
Rule Halifax 1933 only - Oct 2 0:00 0 S
|
|
Rule Halifax 1934 only - May 20 0:00 1:00 D
|
|
Rule Halifax 1934 only - Sep 16 0:00 0 S
|
|
Rule Halifax 1935 only - Jun 2 0:00 1:00 D
|
|
Rule Halifax 1935 only - Sep 30 0:00 0 S
|
|
Rule Halifax 1936 only - Jun 1 0:00 1:00 D
|
|
Rule Halifax 1936 only - Sep 14 0:00 0 S
|
|
Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
|
|
Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
|
|
Rule Halifax 1939 only - May 28 0:00 1:00 D
|
|
Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
|
|
Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D
|
|
Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S
|
|
Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D
|
|
Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S
|
|
Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D
|
|
Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S
|
|
Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D
|
|
Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
|
|
-4:00 Halifax A%sT 1918
|
|
-4:00 Canada A%sT 1919
|
|
-4:00 Halifax A%sT 1942 Feb 9 2:00s
|
|
-4:00 Canada A%sT 1946
|
|
-4:00 Halifax A%sT 1974
|
|
-4:00 Canada A%sT
|
|
Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
|
|
-4:00 Canada A%sT 1953
|
|
-4:00 Halifax A%sT 1954
|
|
-4:00 - AST 1972
|
|
-4:00 Halifax A%sT 1974
|
|
-4:00 Canada A%sT
|
|
|
|
# New Brunswick
|
|
|
|
# From Paul Eggert (2007-01-31):
|
|
# The Time Definition Act <http://www.gnb.ca/0062/PDF-acts/t-06.pdf>
|
|
# says they changed at 00:01 through 2006, and
|
|
# <http://www.canlii.org/nb/laws/sta/t-6/20030127/whole.html> makes it
|
|
# clear that this was the case since at least 1993.
|
|
# For now, assume it started in 1993.
|
|
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
|
|
Rule Moncton 1933 1935 - Jun Sun>=8 1:00 1:00 D
|
|
Rule Moncton 1933 1935 - Sep Sun>=8 1:00 0 S
|
|
Rule Moncton 1936 1938 - Jun Sun>=1 1:00 1:00 D
|
|
Rule Moncton 1936 1938 - Sep Sun>=1 1:00 0 S
|
|
Rule Moncton 1939 only - May 27 1:00 1:00 D
|
|
Rule Moncton 1939 1941 - Sep Sat>=21 1:00 0 S
|
|
Rule Moncton 1940 only - May 19 1:00 1:00 D
|
|
Rule Moncton 1941 only - May 4 1:00 1:00 D
|
|
Rule Moncton 1946 1972 - Apr lastSun 2:00 1:00 D
|
|
Rule Moncton 1946 1956 - Sep lastSun 2:00 0 S
|
|
Rule Moncton 1957 1972 - Oct lastSun 2:00 0 S
|
|
Rule Moncton 1993 2006 - Apr Sun>=1 0:01 1:00 D
|
|
Rule Moncton 1993 2006 - Oct lastSun 0:01 0 S
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Moncton -4:19:08 - LMT 1883 Dec 9
|
|
-5:00 - EST 1902 Jun 15
|
|
-4:00 Canada A%sT 1933
|
|
-4:00 Moncton A%sT 1942
|
|
-4:00 Canada A%sT 1946
|
|
-4:00 Moncton A%sT 1973
|
|
-4:00 Canada A%sT 1993
|
|
-4:00 Moncton A%sT 2007
|
|
-4:00 Canada A%sT
|
|
|
|
# Quebec
|
|
|
|
# From Paul Eggert (2015-03-24):
|
|
# See America/Toronto for most of Quebec, including Montreal.
|
|
#
|
|
# Matthews and Vincent (1998) also write that Quebec east of the -63
|
|
# meridian is supposed to observe AST, but residents as far east as
|
|
# Natashquan use EST/EDT, and residents east of Natashquan use AST.
|
|
# The Quebec department of justice writes in
|
|
# "The situation in Minganie and Basse-Côte-Nord"
|
|
# http://www.justice.gouv.qc.ca/english/publications/generale/temps-minganie-a.htm
|
|
# that the coastal strip from just east of Natashquan to Blanc-Sablon
|
|
# observes Atlantic standard time all year round.
|
|
# https://www.assnat.qc.ca/Media/Process.aspx?MediaId=ANQ.Vigie.Bll.DocumentGenerique_8845en
|
|
# says this common practice was codified into law as of 2007.
|
|
# For lack of better info, guess this practice began around 1970, contra to
|
|
# Shanks & Pottenger who have this region observing AST/ADT.
|
|
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Blanc-Sablon -3:48:28 - LMT 1884
|
|
-4:00 Canada A%sT 1970
|
|
-4:00 - AST
|
|
|
|
# Ontario
|
|
|
|
# From Paul Eggert (2006-07-09):
|
|
# Shanks & Pottenger write that since 1970 most of Ontario has been like
|
|
# Toronto.
|
|
# Thunder Bay skipped DST in 1973.
|
|
# Many smaller locales did not observe peacetime DST until 1974;
|
|
# Nipigon (EST) and Rainy River (CST) are the largest that we know of.
|
|
# Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
|
|
|
|
# From Mark Brader (2003-07-26):
|
|
# [According to the Toronto Star] Orillia, Ontario, adopted DST
|
|
# effective Saturday, 1912-06-22, 22:00; the article mentions that
|
|
# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw
|
|
# have already done so. In Orillia DST was to run until Saturday,
|
|
# 1912-08-31 (no time mentioned), but it was met with considerable
|
|
# hostility from certain segments of the public, and was revoked after
|
|
# only two weeks - I copied it as Saturday, 1912-07-07, 22:00, but
|
|
# presumably that should be -07-06. (1912-06-19, -07-12; also letters
|
|
# earlier in June).
|
|
#
|
|
# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21).
|
|
#
|
|
# From Paul Eggert (2017-07-08):
|
|
# For more on Orillia, see: Daubs K. Bold attempt at daylight saving
|
|
# time became a comic failure in Orillia. Toronto Star 2017-07-08.
|
|
# https://www.thestar.com/news/insight/2017/07/08/bold-attempt-at-daylight-saving-time-became-a-comic-failure-in-orillia.html
|
|
|
|
# From Paul Eggert (1997-10-17):
|
|
# Mark Brader writes that an article in the 1997-10-14 Toronto Star
|
|
# says that Atikokan, Ontario currently does not observe DST,
|
|
# but will vote on 11-10 whether to use EST/EDT.
|
|
# He also writes that the Ontario Time Act (1990, Chapter T.9)
|
|
# http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html
|
|
# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
|
|
# Officially Atikokan is therefore on CST/CDT, and most likely this report
|
|
# concerns a non-official time observed as a matter of local practice.
|
|
#
|
|
# From Paul Eggert (2000-10-02):
|
|
# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
|
|
# New Osnaburgh observe CST all year, that Big Trout Lake observes
|
|
# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in
|
|
# violation of the official Ontario rules.
|
|
#
|
|
# From Paul Eggert (2006-07-09):
|
|
# Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the
|
|
# 2005-07-21 Chronicle-Journal, which said:
|
|
#
|
|
# The clocks in Atikokan stay set on standard time year-round.
|
|
# This means they spend about half the time on central time and
|
|
# the other half on eastern time.
|
|
#
|
|
# For the most part, the system works, Mayor Dennis Brown said.
|
|
#
|
|
# "The majority of businesses in Atikokan deal more with Eastern
|
|
# Canada, but there are some that deal with Western Canada," he
|
|
# said. "I don't see any changes happening here."
|
|
#
|
|
# Walton also writes "Supposedly Pickle Lake and Mishkeegogamang
|
|
# [New Osnaburgh] follow the same practice."
|
|
|
|
# From Garry McKinnon (2006-07-14) via Chris Walton:
|
|
# I chatted with a member of my board who has an outstanding memory
|
|
# and a long history in Atikokan (and in the telecom industry) and he
|
|
# can say for certain that Atikokan has been practicing the current
|
|
# time keeping since 1952, at least.
|
|
|
|
# From Paul Eggert (2006-07-17):
|
|
# Shanks & Pottenger say that Atikokan has agreed with Rainy River
|
|
# ever since standard time was introduced, but the information from
|
|
# McKinnon sounds more authoritative. For now, assume that Atikokan
|
|
# switched to EST immediately after WWII era daylight saving time
|
|
# ended. This matches the old (less-populous) America/Coral_Harbour
|
|
# entry since our cutoff date of 1970, so we can move
|
|
# America/Coral_Harbour to the 'backward' file.
|
|
|
|
# From Mark Brader (2010-03-06):
|
|
#
|
|
# Currently the database has:
|
|
#
|
|
# # Ontario
|
|
#
|
|
# # From Paul Eggert (2006-07-09):
|
|
# # Shanks & Pottenger write that since 1970 most of Ontario has been like
|
|
# # Toronto.
|
|
# # Thunder Bay skipped DST in 1973.
|
|
# # Many smaller locales did not observe peacetime DST until 1974;
|
|
# # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
|
|
#
|
|
# In the (Toronto) Globe and Mail for Saturday, 1955-09-24, in the bottom
|
|
# right corner of page 1, it says that Toronto will return to standard
|
|
# time at 2 am Sunday morning (which agrees with the database), and that:
|
|
#
|
|
# The one-hour setback will go into effect throughout most of Ontario,
|
|
# except in areas like Windsor which remains on standard time all year.
|
|
#
|
|
# Windsor is, of course, a lot larger than Nipigon.
|
|
#
|
|
# I only came across this incidentally. I don't know if Windsor began
|
|
# observing DST when Detroit did, or in 1974, or on some other date.
|
|
#
|
|
# By the way, the article continues by noting that:
|
|
#
|
|
# Some cities in the United States have pushed the deadline back
|
|
# three weeks and will change over from daylight saving in October.
|
|
|
|
# From Arthur David Olson (2010-07-17):
|
|
#
|
|
# "Standard Time and Time Zones in Canada" appeared in
|
|
# The Journal of The Royal Astronomical Society of Canada,
|
|
# volume 26, number 2 (February 1932) and, as of 2010-07-17,
|
|
# was available at
|
|
# http://adsabs.harvard.edu/full/1932JRASC..26...49S
|
|
#
|
|
# It includes the text below (starting on page 57):
|
|
#
|
|
# A list of the places in Canada using daylight saving time would
|
|
# require yearly revision. From information kindly furnished by
|
|
# the provincial governments and by the postmasters in many cities
|
|
# and towns, it is found that the following places used daylight sav-
|
|
# ing in 1930. The information for the province of Quebec is definite,
|
|
# for the other provinces only approximate:
|
|
#
|
|
# Province Daylight saving time used
|
|
# Prince Edward Island Not used.
|
|
# Nova Scotia In Halifax only.
|
|
# New Brunswick In St. John only.
|
|
# Quebec In the following places:
|
|
# Montreal Lachine
|
|
# Quebec Mont-Royal
|
|
# Lévis Iberville
|
|
# St. Lambert Cap de la Madelèine
|
|
# Verdun Loretteville
|
|
# Westmount Richmond
|
|
# Outremont St. Jérôme
|
|
# Longueuil Greenfield Park
|
|
# Arvida Waterloo
|
|
# Chambly-Canton Beaulieu
|
|
# Melbourne La Tuque
|
|
# St. Théophile Buckingham
|
|
# Ontario Used generally in the cities and towns along
|
|
# the southerly part of the province. Not
|
|
# used in the northwesterly part.
|
|
# Manitoba Not used.
|
|
# Saskatchewan In Regina only.
|
|
# Alberta Not used.
|
|
# British Columbia Not used.
|
|
#
|
|
# With some exceptions, the use of daylight saving may be said to be limited
|
|
# to those cities and towns lying between Quebec city and Windsor, Ont.
|
|
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
|
|
Rule Toronto 1919 only - Mar 30 23:30 1:00 D
|
|
Rule Toronto 1919 only - Oct 26 0:00 0 S
|
|
Rule Toronto 1920 only - May 2 2:00 1:00 D
|
|
Rule Toronto 1920 only - Sep 26 0:00 0 S
|
|
Rule Toronto 1921 only - May 15 2:00 1:00 D
|
|
Rule Toronto 1921 only - Sep 15 2:00 0 S
|
|
Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D
|
|
# Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16"
|
|
# was meant.
|
|
Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S
|
|
Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D
|
|
# The 1927-to-1939 rules can be expressed more simply as
|
|
# Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S
|
|
# Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D
|
|
# Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D
|
|
# Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S
|
|
# The rules below avoid use of Sun>=25
|
|
# (which pre-2004 versions of zic cannot handle).
|
|
Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S
|
|
Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D
|
|
Rule Toronto 1932 only - May 1 2:00 1:00 D
|
|
Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D
|
|
Rule Toronto 1933 only - Oct 1 2:00 0 S
|
|
Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S
|
|
Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S
|
|
Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D
|
|
Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D
|
|
Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S
|
|
Rule Toronto 1949 only - Nov lastSun 0:00 0 S
|
|
Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D
|
|
Rule Toronto 1950 only - Nov lastSun 2:00 0 S
|
|
Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S
|
|
# Shanks & Pottenger say Toronto ended DST a week early in 1971,
|
|
# namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this
|
|
# is wrong, and that he had confirmed it by checking the 1971-10-30
|
|
# Toronto Star, which said that DST was ending 1971-10-31 as usual.
|
|
Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S
|
|
|
|
# From Paul Eggert (2003-07-27):
|
|
# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and
|
|
# Port Arthur, Ontario, the principle of the Bill has been in
|
|
# operation for the past three years, and in the City of Moose Jaw,
|
|
# Saskatchewan, for one year."
|
|
|
|
# From David Bryan via Tory Tronrud, Director/Curator,
|
|
# Thunder Bay Museum (2003-11-12):
|
|
# There is some suggestion, however, that, by-law or not, daylight
|
|
# savings time was being practiced in Fort William and Port Arthur
|
|
# before 1909.... [I]n 1910, the line between the Eastern and Central
|
|
# Time Zones was permanently moved about two hundred miles west to
|
|
# include the Thunder Bay area.... When Canada adopted daylight
|
|
# savings time in 1916, Fort William and Port Arthur, having done so
|
|
# already, did not change their clocks.... During the Second World
|
|
# War,... [t]he cities agreed to implement DST during the summer
|
|
# months for the remainder of the war years.
|
|
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Toronto -5:17:32 - LMT 1895
|
|
-5:00 Canada E%sT 1919
|
|
-5:00 Toronto E%sT 1942 Feb 9 2:00s
|
|
-5:00 Canada E%sT 1946
|
|
-5:00 Toronto E%sT 1974
|
|
-5:00 Canada E%sT
|
|
Zone America/Thunder_Bay -5:57:00 - LMT 1895
|
|
-6:00 - CST 1910
|
|
-5:00 - EST 1942
|
|
-5:00 Canada E%sT 1970
|
|
-5:00 Toronto E%sT 1973
|
|
-5:00 - EST 1974
|
|
-5:00 Canada E%sT
|
|
Zone America/Nipigon -5:53:04 - LMT 1895
|
|
-5:00 Canada E%sT 1940 Sep 29
|
|
-5:00 1:00 EDT 1942 Feb 9 2:00s
|
|
-5:00 Canada E%sT
|
|
Zone America/Rainy_River -6:18:16 - LMT 1895
|
|
-6:00 Canada C%sT 1940 Sep 29
|
|
-6:00 1:00 CDT 1942 Feb 9 2:00s
|
|
-6:00 Canada C%sT
|
|
Zone America/Atikokan -6:06:28 - LMT 1895
|
|
-6:00 Canada C%sT 1940 Sep 29
|
|
-6:00 1:00 CDT 1942 Feb 9 2:00s
|
|
-6:00 Canada C%sT 1945 Sep 30 2:00
|
|
-5:00 - EST
|
|
|
|
|
|
# Manitoba
|
|
|
|
# From Rob Douglas (2006-04-06):
|
|
# the old Manitoba Time Act - as amended by Bill 2, assented to
|
|
# March 27, 1987 ... said ...
|
|
# "between two o'clock Central Standard Time in the morning of
|
|
# the first Sunday of April of each year and two o'clock Central
|
|
# Standard Time in the morning of the last Sunday of October next
|
|
# following, one hour in advance of Central Standard Time."...
|
|
# I believe that the English legislation [of the old time act] had
|
|
# been assented to (March 22, 1967)....
|
|
# Also, as far as I can tell, there was no order-in-council varying
|
|
# the time of Daylight Saving Time for 2005 and so the provisions of
|
|
# the 1987 version would apply - the changeover was at 2:00 Central
|
|
# Standard Time (i.e. not until 3:00 Central Daylight Time).
|
|
|
|
# From Paul Eggert (2006-04-10):
|
|
# Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s)
|
|
# starting 1966. Since 02:00s is clearly correct for 1967 on, assume
|
|
# it was also 02:00s in 1966.
|
|
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
|
|
Rule Winn 1916 only - Apr 23 0:00 1:00 D
|
|
Rule Winn 1916 only - Sep 17 0:00 0 S
|
|
Rule Winn 1918 only - Apr 14 2:00 1:00 D
|
|
Rule Winn 1918 only - Oct 27 2:00 0 S
|
|
Rule Winn 1937 only - May 16 2:00 1:00 D
|
|
Rule Winn 1937 only - Sep 26 2:00 0 S
|
|
Rule Winn 1942 only - Feb 9 2:00 1:00 W # War
|
|
Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace
|
|
Rule Winn 1945 only - Sep lastSun 2:00 0 S
|
|
Rule Winn 1946 only - May 12 2:00 1:00 D
|
|
Rule Winn 1946 only - Oct 13 2:00 0 S
|
|
Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
|
|
Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
|
|
Rule Winn 1950 only - May 1 2:00 1:00 D
|
|
Rule Winn 1950 only - Sep 30 2:00 0 S
|
|
Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
|
|
Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
|
|
Rule Winn 1959 only - Oct lastSun 2:00 0 S
|
|
Rule Winn 1960 only - Sep lastSun 2:00 0 S
|
|
Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
|
|
Rule Winn 1963 only - Sep 22 2:00 0 S
|
|
Rule Winn 1966 1986 - Apr lastSun 2:00s 1:00 D
|
|
Rule Winn 1966 2005 - Oct lastSun 2:00s 0 S
|
|
Rule Winn 1987 2005 - Apr Sun>=1 2:00s 1:00 D
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
|
|
-6:00 Winn C%sT 2006
|
|
-6:00 Canada C%sT
|
|
|
|
|
|
# Saskatchewan
|
|
|
|
# From Mark Brader (2003-07-26):
|
|
# The first actual adoption of DST in Canada was at the municipal
|
|
# level. As the [Toronto] Star put it (1912-06-07), "While people
|
|
# elsewhere have long been talking of legislation to save daylight,
|
|
# the city of Moose Jaw [Saskatchewan] has acted on its own hook."
|
|
# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned:
|
|
# presumably late evening, as below), and would run until "the end of
|
|
# the summer". The discrepancy between municipal time and railroad
|
|
# time was noted.
|
|
|
|
# From Paul Eggert (2003-07-27):
|
|
# Willett (1914-03) notes that DST "has been in operation ... in the
|
|
# City of Moose Jaw, Saskatchewan, for one year."
|
|
|
|
# From Paul Eggert (2006-03-22):
|
|
# Shanks & Pottenger say that since 1970 this region has mostly been as Regina.
|
|
# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
|
|
# Other western towns (e.g. Lloydminster) are like Edmonton.
|
|
# Matthews and Vincent (1998) write that Denare Beach and Creighton
|
|
# are like Winnipeg, in violation of Saskatchewan law.
|
|
|
|
# From W. Jones (1992-11-06):
|
|
# The. . .below is based on information I got from our law library, the
|
|
# provincial archives, and the provincial Community Services department.
|
|
# A precise history would require digging through newspaper archives, and
|
|
# since you didn't say what you wanted, I didn't bother.
|
|
#
|
|
# Saskatchewan is split by a time zone meridian (105W) and over the years
|
|
# the boundary became pretty ragged as communities near it reevaluated
|
|
# their affiliations in one direction or the other. In 1965 a provincial
|
|
# referendum favoured legislating common time practices.
|
|
#
|
|
# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
|
|
# Saskatchewan 1978) was proclaimed, and established that the eastern
|
|
# part of Saskatchewan would use CST year round, that districts in
|
|
# northwest Saskatchewan would by default follow CST but could opt to
|
|
# follow Mountain Time rules (thus 1 hour difference in the winter and
|
|
# zero in the summer), and that districts in southwest Saskatchewan would
|
|
# by default follow MT but could opt to follow CST.
|
|
#
|
|
# It took a few years for the dust to settle (I know one story of a town
|
|
# on one time zone having its school in another, such that a mom had to
|
|
# serve her family lunch in two shifts), but presently it seems that only
|
|
# a few towns on the border with Alberta (e.g. Lloydminster) follow MT
|
|
# rules any more; all other districts appear to have used CST year round
|
|
# since sometime in the 1960s.
|
|
|
|
# From Chris Walton (2006-06-26):
|
|
# The Saskatchewan time act which was last updated in 1996 is about 30 pages
|
|
# long and rather painful to read.
|
|
# http://www.qp.gov.sk.ca/documents/English/Statutes/Statutes/T14.pdf
|
|
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
|
|
Rule Regina 1918 only - Apr 14 2:00 1:00 D
|
|
Rule Regina 1918 only - Oct 27 2:00 0 S
|
|
Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
|
|
Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
|
|
Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
|
|
Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
|
|
Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
|
|
Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
|
|
Rule Regina 1942 only - Feb 9 2:00 1:00 W # War
|
|
Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace
|
|
Rule Regina 1945 only - Sep lastSun 2:00 0 S
|
|
Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
|
|
Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
|
|
Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D
|
|
Rule Regina 1947 1957 - Sep lastSun 2:00 0 S
|
|
Rule Regina 1959 only - Apr lastSun 2:00 1:00 D
|
|
Rule Regina 1959 only - Oct lastSun 2:00 0 S
|
|
#
|
|
Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
|
|
Rule Swift 1957 only - Oct lastSun 2:00 0 S
|
|
Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
|
|
Rule Swift 1959 only - Oct lastSun 2:00 0 S
|
|
Rule Swift 1960 1961 - Sep lastSun 2:00 0 S
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Regina -6:58:36 - LMT 1905 Sep
|
|
-7:00 Regina M%sT 1960 Apr lastSun 2:00
|
|
-6:00 - CST
|
|
Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
|
|
-7:00 Canada M%sT 1946 Apr lastSun 2:00
|
|
-7:00 Regina M%sT 1950
|
|
-7:00 Swift M%sT 1972 Apr lastSun 2:00
|
|
-6:00 - CST
|
|
|
|
|
|
# Alberta
|
|
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
|
|
Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
|
|
Rule Edm 1918 only - Oct 27 2:00 0 S
|
|
Rule Edm 1919 only - May 27 2:00 0 S
|
|
Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
|
|
Rule Edm 1920 only - Oct lastSun 2:00 0 S
|
|
Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
|
|
Rule Edm 1942 only - Feb 9 2:00 1:00 W # War
|
|
Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace
|
|
Rule Edm 1945 only - Sep lastSun 2:00 0 S
|
|
Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
|
|
Rule Edm 1947 only - Sep lastSun 2:00 0 S
|
|
Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
|
|
Rule Edm 1967 only - Oct lastSun 2:00 0 S
|
|
Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
|
|
Rule Edm 1969 only - Oct lastSun 2:00 0 S
|
|
Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
|
|
Rule Edm 1972 2006 - Oct lastSun 2:00 0 S
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Edmonton -7:33:52 - LMT 1906 Sep
|
|
-7:00 Edm M%sT 1987
|
|
-7:00 Canada M%sT
|
|
|
|
|
|
# British Columbia
|
|
|
|
# From Paul Eggert (2006-03-22):
|
|
# Shanks & Pottenger write that since 1970 most of this region has
|
|
# been like Vancouver.
|
|
# Dawson Creek uses MST. Much of east BC is like Edmonton.
|
|
# Matthews and Vincent (1998) write that Creston is like Dawson Creek.
|
|
|
|
# It seems though that (re: Creston) is not entirely correct:
|
|
|
|
# From Chris Walton (2011-12-01):
|
|
# There are two areas within the Canadian province of British Columbia
|
|
# that do not currently observe daylight saving:
|
|
# a) The Creston Valley (includes the town of Creston and surrounding area)
|
|
# b) The eastern half of the Peace River Regional District
|
|
# (includes the cities of Dawson Creek and Fort St. John)
|
|
|
|
# Earlier this year I stumbled across a detailed article about the time
|
|
# keeping history of Creston; it was written by Tammy Hardwick who is the
|
|
# manager of the Creston & District Museum. The article was written in May 2009.
|
|
# http://www.ilovecreston.com/?p=articles&t=spec&ar=260
|
|
# According to the article, Creston has not changed its clocks since June 1918.
|
|
# i.e. Creston has been stuck on UT-7 for 93 years.
|
|
# Dawson Creek, on the other hand, changed its clocks as recently as April 1972.
|
|
|
|
# Unfortunately the exact date for the time change in June 1918 remains
|
|
# unknown and will be difficult to ascertain. I e-mailed Tammy a few months
|
|
# ago to ask if Sunday June 2 was a reasonable guess. She said it was just
|
|
# as plausible as any other date (in June). She also said that after writing
|
|
# the article she had discovered another time change in 1916; this is the
|
|
# subject of another article which she wrote in October 2010.
|
|
# http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56
|
|
|
|
# Here is a summary of the three clock change events in Creston's history:
|
|
# 1. 1884 or 1885: adoption of Mountain Standard Time (GMT-7)
|
|
# Exact date unknown
|
|
# 2. Oct 1916: switch to Pacific Standard Time (GMT-8)
|
|
# Exact date in October unknown; Sunday October 1 is a reasonable guess.
|
|
# 3. June 1918: switch to Pacific Daylight Time (GMT-7)
|
|
# Exact date in June unknown; Sunday June 2 is a reasonable guess.
|
|
# note 1:
|
|
# On Oct 27/1918 when daylight saving ended in the rest of Canada,
|
|
# Creston did not change its clocks.
|
|
# note 2:
|
|
# During WWII when the Federal Government legislated a mandatory clock change,
|
|
# Creston did not oblige.
|
|
# note 3:
|
|
# There is no guarantee that Creston will remain on Mountain Standard Time
|
|
# (UTC-7) forever.
|
|
# The subject was debated at least once this year by the town Council.
|
|
# http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html
|
|
|
|
# During a period WWII, summer time (Daylight saying) was mandatory in Canada.
|
|
# In Creston, that was handled by shifting the area to PST (-8:00) then applying
|
|
# summer time to cause the offset to be -7:00, the same as it had been before
|
|
# the change. It can be argued that the timezone abbreviation during this
|
|
# period should be PDT rather than MST, but that doesn't seem important enough
|
|
# (to anyone) to further complicate the rules.
|
|
|
|
# The transition dates (and times) are guesses.
|
|
|
|
# From Matt Johnson (2015-09-21):
|
|
# Fort Nelson, BC, Canada will cancel DST this year. So while previously they
|
|
# were aligned with America/Vancouver, they're now aligned with
|
|
# America/Dawson_Creek.
|
|
# http://www.northernrockies.ca/EN/meta/news/archives/2015/northern-rockies-time-change.html
|
|
#
|
|
# From Tim Parenti (2015-09-23):
|
|
# This requires a new zone for the Northern Rockies Regional Municipality,
|
|
# America/Fort_Nelson. The resolution of 2014-12-08 was reached following a
|
|
# 2014-11-15 poll with nearly 75% support. Effectively, the municipality has
|
|
# been on MST (-0700) like Dawson Creek since it advanced its clocks on
|
|
# 2015-03-08.
|
|
#
|
|
# From Paul Eggert (2015-09-23):
|
|
# Shanks says Fort Nelson did not observe DST in 1946, unlike Vancouver.
|
|
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
|
|
Rule Vanc 1918 only - Apr 14 2:00 1:00 D
|
|
Rule Vanc 1918 only - Oct 27 2:00 0 S
|
|
Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War
|
|
Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace
|
|
Rule Vanc 1945 only - Sep 30 2:00 0 S
|
|
Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
|
|
Rule Vanc 1946 only - Oct 13 2:00 0 S
|
|
Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
|
|
Rule Vanc 1962 2006 - Oct lastSun 2:00 0 S
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Vancouver -8:12:28 - LMT 1884
|
|
-8:00 Vanc P%sT 1987
|
|
-8:00 Canada P%sT
|
|
Zone America/Dawson_Creek -8:00:56 - LMT 1884
|
|
-8:00 Canada P%sT 1947
|
|
-8:00 Vanc P%sT 1972 Aug 30 2:00
|
|
-7:00 - MST
|
|
Zone America/Fort_Nelson -8:10:47 - LMT 1884
|
|
-8:00 Vanc P%sT 1946
|
|
-8:00 - PST 1947
|
|
-8:00 Vanc P%sT 1987
|
|
-8:00 Canada P%sT 2015 Mar 8 2:00
|
|
-7:00 - MST
|
|
Zone America/Creston -7:46:04 - LMT 1884
|
|
-7:00 - MST 1916 Oct 1
|
|
-8:00 - PST 1918 Jun 2
|
|
-7:00 - MST
|
|
|
|
# Northwest Territories, Nunavut, Yukon
|
|
|
|
# From Paul Eggert (2006-03-22):
|
|
# Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
|
|
# Mathew Englander (1996-10-07) gives the following refs:
|
|
# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
|
|
# c. 7 defines Yukon standard time as UTC-9....
|
|
# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
|
|
# [https://www.canlii.org/en/ca/laws/stat/rsc-1985-c-i-21/latest/rsc-1985-c-i-21.html]
|
|
# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
|
|
# * O.I.C. 1980/02 established DST.
|
|
# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
|
|
|
|
# From Brian Inglis (2015-04-14):
|
|
#
|
|
# I tried to trace the history of Yukon time and found the following
|
|
# regulations, giving the reference title and URL if found, regulation name,
|
|
# and relevant quote if available. Each regulation specifically revokes its
|
|
# predecessor. The final reference is to the current Interpretation Act
|
|
# authorizing and resulting from these regulatory changes.
|
|
#
|
|
# Only recent regulations were retrievable via Yukon government site search or
|
|
# index, and only some via Canadian legal sources. Other sources used include
|
|
# articles titled "Standard Time and Time Zones in Canada" from JRASC via ADS
|
|
# Abstracts, cited by ADO for 1932 ..., and updated versions from 1958 and
|
|
# 1970 quoted below; each article includes current extracts from provincial
|
|
# and territorial ST and DST regulations at the end, summaries and details of
|
|
# standard times and daylight saving time at many locations across Canada,
|
|
# with time zone maps, tables and calculations for Canadian Sunrise, Sunset,
|
|
# and LMST; they also cover many countries and global locations, with a chart
|
|
# and table showing current Universal Time offsets, and may be useful as
|
|
# another source of information for 1970 and earlier.
|
|
#
|
|
# * Standard Time and Time Zones in Canada; Smith, C.C.; JRASC, Vol. 26,
|
|
# pp.49-77; February 1932; SAO/NASA Astrophysics Data System (ADS)
|
|
# http://adsabs.harvard.edu/abs/1932JRASC..26...49S from p.75:
|
|
# Yukon Interpretation Ordinance
|
|
# Yukon standard time is the local mean time at the one hundred and
|
|
# thirty-fifth meridian.
|
|
#
|
|
# * Standard Time and Time Zones in Canada; Smith, C.C.; Thomson, Malcolm M.;
|
|
# JRASC, Vol. 52, pp.193-223; October 1958; SAO/NASA Astrophysics Data System
|
|
# (ADS) http://adsabs.harvard.edu/abs/1958JRASC..52..193S from pp.220-1:
|
|
# Yukon Interpretation Ordinance, 1955, Chap. 16.
|
|
#
|
|
# (1) Subject to this section, standard time shall be reckoned as nine
|
|
# hours behind Greenwich Time and called Yukon Standard Time.
|
|
#
|
|
# (2) Notwithstanding subsection (1), the Commissioner may make regulations
|
|
# varying the manner of reckoning standard time.
|
|
#
|
|
# * Yukon Territory Commissioner's Order 1966-20 Interpretation Ordinance
|
|
# http://? - no online source found
|
|
#
|
|
# * Standard Time and Time Zones in Canada; Thomson, Malcolm M.; JRASC,
|
|
# Vol. 64, pp.129-162; June 1970; SAO/NASA Astrophysics Data System (ADS)
|
|
# http://adsabs.harvard.edu/abs/1970JRASC..64..129T from p.156: Yukon
|
|
# Territory Commissioner's Order 1967-59 Interpretation Ordinance ...
|
|
#
|
|
# 1. Commissioner's Order 1966-20 dated at Whitehorse in the Yukon
|
|
# Territory on 27th January, 1966, is hereby revoked.
|
|
#
|
|
# 2. Yukon (East) Standard Time as defined by section 36 of the
|
|
# Interpretation Ordinance from and after mid-night on the 28th day of May,
|
|
# 1967 shall be reckoned in the same manner as Pacific Standard Time, that
|
|
# is to say, eight hours behind Greenwich Time in the area of the Yukon
|
|
# Territory lying east of the 138th degree longitude west.
|
|
#
|
|
# 3. In the remainder of the Territory, lying west of the 138th degree
|
|
# longitude west, Yukon (West) Standard Time shall be reckoned as nine
|
|
# hours behind Greenwich Time.
|
|
#
|
|
# * Yukon Standard Time defined as Pacific Standard Time, YCO 1973/214
|
|
# https://www.canlii.org/en/yk/laws/regu/yco-1973-214/latest/yco-1973-214.html
|
|
# C.O. 1973/214 INTERPRETATION ACT ...
|
|
#
|
|
# 1. Effective October 28, 1973 Commissioner's Order 1967/59 is hereby
|
|
# revoked.
|
|
#
|
|
# 2. Yukon Standard Time as defined by section 36 of the Interpretation
|
|
# Act from and after midnight on the twenty-eighth day of October, 1973
|
|
# shall be reckoned in the same manner as Pacific Standard Time, that is
|
|
# to say eight hours behind Greenwich Time.
|
|
#
|
|
# * O.I.C. 1980/02 INTERPRETATION ACT
|
|
# http://? - no online source found
|
|
#
|
|
# * Yukon Daylight Saving Time, YOIC 1987/56
|
|
# https://www.canlii.org/en/yk/laws/regu/yoic-1987-56/latest/yoic-1987-56.html
|
|
# O.I.C. 1987/056 INTERPRETATION ACT ...
|
|
#
|
|
# In every year between
|
|
# (a) two o'clock in the morning in the first Sunday in April, and
|
|
# (b) two o'clock in the morning in the last Sunday in October,
|
|
# Standard Time shall be reckoned as seven hours behind Greenwich Time and
|
|
# called Yukon Daylight Saving Time.
|
|
# ...
|
|
# Dated ... 9th day of March, A.D., 1987.
|
|
#
|
|
# * Yukon Daylight Saving Time 2006, YOIC 2006/127
|
|
# https://www.canlii.org/en/yk/laws/regu/yoic-2006-127/latest/yoic-2006-127.html
|
|
# O.I.C. 2006/127 INTERPRETATION ACT ...
|
|
#
|
|
# 1. In Yukon each year the time for general purposes shall be 7 hours
|
|
# behind Greenwich mean time during the period commencing at two o'clock
|
|
# in the forenoon on the second Sunday of March and ending at two o'clock
|
|
# in the forenoon on the first Sunday of November and shall be called
|
|
# Yukon Daylight Saving Time.
|
|
#
|
|
# 2. Order-in-Council 1987/56 is revoked.
|
|
#
|
|
# 3. This order comes into force January 1, 2007.
|
|
#
|
|
# * Interpretation Act, RSY 2002, c 125
|
|
# https://www.canlii.org/en/yk/laws/stat/rsy-2002-c-125/latest/rsy-2002-c-125.html
|
|
|
|
# From Rives McDow (1999-09-04):
|
|
# Nunavut ... moved ... to incorporate the whole territory into one time zone.
|
|
# Nunavut moves to single time zone Oct. 31
|
|
# http://www.nunatsiaq.com/nunavut/nvt90903_13.html
|
|
#
|
|
# From Antoine Leca (1999-09-06):
|
|
# We then need to create a new timezone for the Kitikmeot region of Nunavut
|
|
# to differentiate it from the Yellowknife region.
|
|
|
|
# From Paul Eggert (1999-09-20):
|
|
# Basic Facts: The New Territory
|
|
# http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html
|
|
# (1999) reports that Pangnirtung operates on eastern time,
|
|
# and that Coral Harbour does not observe DST. We don't know when
|
|
# Pangnirtung switched to eastern time; we'll guess 1995.
|
|
|
|
# From Rives McDow (1999-11-08):
|
|
# On October 31, when the rest of Nunavut went to Central time,
|
|
# Pangnirtung wobbled. Here is the result of their wobble:
|
|
#
|
|
# The following businesses and organizations in Pangnirtung use Central Time:
|
|
#
|
|
# First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
|
|
# Eastern Arctic National Parks, A & D Specialist
|
|
#
|
|
# The following businesses and organizations in Pangnirtung use Eastern Time:
|
|
#
|
|
# Hamlet office, All other businesses, Both schools, Airport operator
|
|
#
|
|
# This has made for an interesting situation there, which warranted the news.
|
|
# No one there that I spoke with seems concerned, or has plans to
|
|
# change the local methods of keeping time, as it evidently does not
|
|
# really interfere with any activities or make things difficult locally.
|
|
# They plan to celebrate New Year's turn-over twice, one hour apart,
|
|
# so it appears that the situation will last at least that long.
|
|
# The Nunavut Intergovernmental Affairs hopes that they will "come to
|
|
# their senses", but the locals evidently don't see any problem with
|
|
# the current state of affairs.
|
|
|
|
# From Michaela Rodrigue, writing in the
|
|
# Nunatsiaq News (1999-11-19):
|
|
# http://www.nunatsiaqonline.ca/archives/nunavut991130/nvt91119_17.html
|
|
# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
|
|
# central - or Nunavut time - for government offices, and eastern time
|
|
# for municipal offices and schools.... Igloolik [was similar but then]
|
|
# made the switch to central time on Saturday, Nov. 6.
|
|
|
|
# From Paul Eggert (2000-10-02):
|
|
# Matthews and Vincent (1998) say the following, but we lack histories
|
|
# for these potential new Zones.
|
|
#
|
|
# The Canadian Forces station at Alert uses Eastern Time while the
|
|
# handful of residents at the Eureka weather station [in the Central
|
|
# zone] skip daylight savings. Baffin Island, which is crossed by the
|
|
# Central, Eastern and Atlantic Time zones only uses Eastern Time.
|
|
# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of
|
|
# Central Time and Southampton Island [in the Central zone] is not
|
|
# required to use daylight savings.
|
|
|
|
# From <http://www.nunatsiaqonline.ca/archives/nunavut001130/nvt21110_02.html>
|
|
# Nunavut now has two time zones (2000-11-10):
|
|
# The Nunavut government would allow its employees in Kugluktuk and
|
|
# Cambridge Bay to operate on central time year-round, putting them
|
|
# one hour behind the rest of Nunavut for six months during the winter.
|
|
# At the end of October the two communities had rebelled against
|
|
# Nunavut's unified time zone, refusing to shift to eastern time with
|
|
# the rest of the territory for the winter. Cambridge Bay remained on
|
|
# central time, while Kugluktuk, even farther west, reverted to
|
|
# mountain time, which they had used before the advent of Nunavut's
|
|
# unified time zone in 1999.
|
|
#
|
|
# From Rives McDow (2001-01-20), quoting the Nunavut government:
|
|
# The preceding decision came into effect at midnight, Saturday Nov 4, 2000.
|
|
|
|
# From Paul Eggert (2000-12-04):
|
|
# Let's just keep track of the official times for now.
|
|
|
|
# From Rives McDow (2001-03-07):
|
|
# The premier of Nunavut has issued a ministerial statement advising
|
|
# that effective 2001-04-01, the territory of Nunavut will revert
|
|
# back to three time zones (mountain, central, and eastern). Of the
|
|
# cities in Nunavut, Coral Harbor is the only one that I know of that
|
|
# has said it will not observe dst, staying on EST year round. I'm
|
|
# checking for more info, and will get back to you if I come up with
|
|
# more.
|
|
# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).]
|
|
|
|
# From Gwillim Law (2005-05-21):
|
|
# According to ...
|
|
# http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp
|
|
# (from a 1998 Canadian Geographic article), the de facto and de jure time
|
|
# for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year
|
|
# round. Using Google, it's easy to find other websites that confirm this.
|
|
# I wasn't able to find how far back this time regimen goes, but since it
|
|
# predates the creation of Nunavut, it probably goes back many years....
|
|
# The Inuktitut name of Coral Harbour is Sallit, but it's rarely used.
|
|
#
|
|
# From Paul Eggert (2014-10-17):
|
|
# For lack of better information, assume that Southampton Island observed
|
|
# daylight saving only during wartime. Gwillim Law's email also
|
|
# mentioned maps now maintained by National Research Council Canada;
|
|
# see above for an up-to-date link.
|
|
|
|
# From Chris Walton (2007-03-01):
|
|
# ... the community of Resolute (located on Cornwallis Island in
|
|
# Nunavut) moved from Central Time to Eastern Time last November.
|
|
# Basically the community did not change its clocks at the end of
|
|
# daylight saving....
|
|
# http://www.nnsl.com/frames/newspapers/2006-11/nov13_06none.html
|
|
|
|
# From Chris Walton (2011-03-21):
|
|
# Back in 2007 I initiated the creation of a new "zone file" for Resolute
|
|
# Bay. Resolute Bay is a small community located about 900km north of
|
|
# the Arctic Circle. The zone file was required because Resolute Bay had
|
|
# decided to use UTC-5 instead of UTC-6 for the winter of 2006-2007.
|
|
#
|
|
# According to new information which I received last week, Resolute Bay
|
|
# went back to using UTC-6 in the winter of 2007-2008...
|
|
#
|
|
# On March 11/2007 most of Canada went onto daylight saving. On March
|
|
# 14/2007 I phoned the Resolute Bay hamlet office to do a "time check." I
|
|
# talked to somebody that was both knowledgeable and helpful. I was able
|
|
# to confirm that Resolute Bay was still operating on UTC-5. It was
|
|
# explained to me that Resolute Bay had been on the Eastern Time zone
|
|
# (EST) in the winter, and was now back on the Central Time zone (CDT).
|
|
# i.e. the time zone had changed twice in the last year but the clocks
|
|
# had not moved. The residents had to know which time zone they were in
|
|
# so they could follow the correct TV schedule...
|
|
#
|
|
# On Nov 02/2008 most of Canada went onto standard time. On Nov 03/2008 I
|
|
# phoned the Resolute Bay hamlet office...[D]ue to the challenging nature
|
|
# of the phone call, I decided to seek out an alternate source of
|
|
# information. I found an e-mail address for somebody by the name of
|
|
# Stephanie Adams whose job was listed as "Inns North Support Officer for
|
|
# Arctic Co-operatives." I was under the impression that Stephanie lived
|
|
# and worked in Resolute Bay...
|
|
#
|
|
# On March 14/2011 I phoned the hamlet office again. I was told that
|
|
# Resolute Bay had been using Central Standard Time over the winter of
|
|
# 2010-2011 and that the clocks had therefore been moved one hour ahead
|
|
# on March 13/2011. The person I talked to was aware that Resolute Bay
|
|
# had previously experimented with Eastern Standard Time but he could not
|
|
# tell me when the practice had stopped.
|
|
#
|
|
# On March 17/2011 I searched the Web to find an e-mail address of
|
|
# somebody that might be able to tell me exactly when Resolute Bay went
|
|
# off Eastern Standard Time. I stumbled on the name "Aziz Kheraj." Aziz
|
|
# used to be the mayor of Resolute Bay and he apparently owns half the
|
|
# businesses including "South Camp Inn." This website has some info on
|
|
# Aziz:
|
|
# http://www.uphere.ca/node/493
|
|
#
|
|
# I sent Aziz an e-mail asking when Resolute Bay had stopped using
|
|
# Eastern Standard Time.
|
|
#
|
|
# Aziz responded quickly with this: "hi, The time was not changed for the
|
|
# 1 year only, the following year, the community went back to the old way
|
|
# of "spring ahead-fall behind" currently we are zulu plus 5 hrs and in
|
|
# the winter Zulu plus 6 hrs"
|
|
#
|
|
# This of course conflicted with everything I had ascertained in November 2008.
|
|
#
|
|
# I sent Aziz a copy of my 2008 e-mail exchange with Stephanie. Aziz
|
|
# responded with this: "Hi, Stephanie lives in Winnipeg. I live here, You
|
|
# may want to check with the weather office in Resolute Bay or do a
|
|
# search on the weather through Env. Canada. web site"
|
|
#
|
|
# If I had realized the Stephanie did not live in Resolute Bay I would
|
|
# never have contacted her. I now believe that all the information I
|
|
# obtained in November 2008 should be ignored...
|
|
# I apologize for reporting incorrect information in 2008.
|
|
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
|
|
Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
|
|
Rule NT_YK 1918 only - Oct 27 2:00 0 S
|
|
Rule NT_YK 1919 only - May 25 2:00 1:00 D
|
|
Rule NT_YK 1919 only - Nov 1 0:00 0 S
|
|
Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War
|
|
Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace
|
|
Rule NT_YK 1945 only - Sep 30 2:00 0 S
|
|
Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
|
|
Rule NT_YK 1965 only - Oct lastSun 2:00 0 S
|
|
Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
|
|
Rule NT_YK 1980 2006 - Oct lastSun 2:00 0 S
|
|
Rule NT_YK 1987 2006 - Apr Sun>=1 2:00 1:00 D
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
# aka Panniqtuuq
|
|
Zone America/Pangnirtung 0 - -00 1921 # trading post est.
|
|
-4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00
|
|
-5:00 Canada E%sT 1999 Oct 31 2:00
|
|
-6:00 Canada C%sT 2000 Oct 29 2:00
|
|
-5:00 Canada E%sT
|
|
# formerly Frobisher Bay
|
|
Zone America/Iqaluit 0 - -00 1942 Aug # Frobisher Bay est.
|
|
-5:00 NT_YK E%sT 1999 Oct 31 2:00
|
|
-6:00 Canada C%sT 2000 Oct 29 2:00
|
|
-5:00 Canada E%sT
|
|
# aka Qausuittuq
|
|
Zone America/Resolute 0 - -00 1947 Aug 31 # Resolute founded
|
|
-6:00 NT_YK C%sT 2000 Oct 29 2:00
|
|
-5:00 - EST 2001 Apr 1 3:00
|
|
-6:00 Canada C%sT 2006 Oct 29 2:00
|
|
-5:00 - EST 2007 Mar 11 3:00
|
|
-6:00 Canada C%sT
|
|
# aka Kangiqiniq
|
|
Zone America/Rankin_Inlet 0 - -00 1957 # Rankin Inlet founded
|
|
-6:00 NT_YK C%sT 2000 Oct 29 2:00
|
|
-5:00 - EST 2001 Apr 1 3:00
|
|
-6:00 Canada C%sT
|
|
# aka Iqaluktuuttiaq
|
|
Zone America/Cambridge_Bay 0 - -00 1920 # trading post est.?
|
|
-7:00 NT_YK M%sT 1999 Oct 31 2:00
|
|
-6:00 Canada C%sT 2000 Oct 29 2:00
|
|
-5:00 - EST 2000 Nov 5 0:00
|
|
-6:00 - CST 2001 Apr 1 3:00
|
|
-7:00 Canada M%sT
|
|
Zone America/Yellowknife 0 - -00 1935 # Yellowknife founded?
|
|
-7:00 NT_YK M%sT 1980
|
|
-7:00 Canada M%sT
|
|
Zone America/Inuvik 0 - -00 1953 # Inuvik founded
|
|
-8:00 NT_YK P%sT 1979 Apr lastSun 2:00
|
|
-7:00 NT_YK M%sT 1980
|
|
-7:00 Canada M%sT
|
|
Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
|
|
-9:00 NT_YK Y%sT 1967 May 28 0:00
|
|
-8:00 NT_YK P%sT 1980
|
|
-8:00 Canada P%sT
|
|
Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
|
|
-9:00 NT_YK Y%sT 1973 Oct 28 0:00
|
|
-8:00 NT_YK P%sT 1980
|
|
-8:00 Canada P%sT
|
|
|
|
|
|
###############################################################################
|
|
|
|
# Mexico
|
|
|
|
# From Paul Eggert (2014-12-07):
|
|
# The Investigation and Analysis Service of the
|
|
# Mexican Library of Congress (MLoC) has published a
|
|
# history of Mexican local time (in Spanish)
|
|
# http://www.diputados.gob.mx/bibliot/publica/inveyana/polisoc/horver/index.htm
|
|
#
|
|
# Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC.
|
|
# (In all cases we go with the MLoC.)
|
|
# S&P report that Baja was at -8:00 in 1922/1923.
|
|
# S&P say the 1930 transition in Baja was 1930-11-16.
|
|
# S&P report no DST during summer 1931.
|
|
# S&P report a transition at 1932-03-30 23:00, not 1932-04-01.
|
|
|
|
# From Gwillim Law (2001-02-20):
|
|
# There are some other discrepancies between the Decrees page and the
|
|
# tz database. I think they can best be explained by supposing that
|
|
# the researchers who prepared the Decrees page failed to find some of
|
|
# the relevant documents.
|
|
|
|
# From Alan Perry (1996-02-15):
|
|
# A guy from our Mexico subsidiary finally found the Presidential Decree
|
|
# outlining the timezone changes in Mexico.
|
|
#
|
|
# ------------- Begin Forwarded Message -------------
|
|
#
|
|
# I finally got my hands on the Official Presidential Decree that sets up the
|
|
# rules for the DST changes. The rules are:
|
|
#
|
|
# 1. The country is divided in 3 timezones:
|
|
# - Baja California Norte (the Mexico/BajaNorte TZ)
|
|
# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
|
|
# - The rest of the country (the Mexico/General TZ)
|
|
#
|
|
# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
|
|
# at 2:00 AM, the times in each zone are as follows:
|
|
# BajaNorte: GMT+7
|
|
# BajaSur: GMT+6
|
|
# General: GMT+5
|
|
#
|
|
# 3. The rest of the year, the times are as follows:
|
|
# BajaNorte: GMT+8
|
|
# BajaSur: GMT+7
|
|
# General: GMT+6
|
|
#
|
|
# The Decree was published in Mexico's Official Newspaper on January 4th.
|
|
#
|
|
# -------------- End Forwarded Message --------------
|
|
# From Paul Eggert (1996-06-12):
|
|
# For an English translation of the decree, see
|
|
# "Diario Oficial: Time Zone Changeover" (1996-01-04).
|
|
# http://mexico-travel.com/extra/timezone_eng.html
|
|
|
|
# From Rives McDow (1998-10-08):
|
|
# The State of Quintana Roo has reverted back to central STD and DST times
|
|
# (i.e. UTC -0600 and -0500 as of 1998-08-02).
|
|
|
|
# From Rives McDow (2000-01-10):
|
|
# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
|
|
# zone 5 hours from the International Date Line, and will not observe daylight
|
|
# savings time so as to stay on the same time zone as the southern part of
|
|
# Arizona year round.
|
|
|
|
# From Jesper Nørgaard, translating
|
|
# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17):
|
|
# In Oaxaca, the 55.000 teachers from the Section 22 of the National
|
|
# Syndicate of Education Workers, refuse to apply daylight saving each
|
|
# year, so that the more than 10,000 schools work at normal hour the
|
|
# whole year.
|
|
|
|
# From Gwillim Law (2001-01-19):
|
|
# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says
|
|
# (translated):...
|
|
# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced
|
|
# that Summer Time will be reduced from seven to five months, starting
|
|
# this year....
|
|
# http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001
|
|
# [translated], says "summer time will ... take effect on the first Sunday
|
|
# in May, and end on the last Sunday of September.
|
|
|
|
# From Arthur David Olson (2001-01-25):
|
|
# The 2001-01-24 traditional Washington Post contained the page one
|
|
# story "Timely Issue Divides Mexicans."...
|
|
# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html
|
|
# ... Mexico City Mayor López Obrador "...is threatening to keep
|
|
# Mexico City and its 20 million residents on a different time than
|
|
# the rest of the country..." In particular, López Obrador would abolish
|
|
# observation of Daylight Saving Time.
|
|
|
|
# Official statute published by the Energy Department
|
|
# http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre
|
|
# (2001-02-01) shows Baja and Chihauhua as still using US DST rules,
|
|
# and Sonora with no DST. This was reported by Jesper Nørgaard (2001-02-03).
|
|
|
|
# From Paul Eggert (2001-03-03):
|
|
#
|
|
# http://www.latimes.com/news/nation/20010303/t000018766.html
|
|
# James F. Smith writes in today's LA Times
|
|
# * Sonora will continue to observe standard time.
|
|
# * Last week Mexico City's mayor Andrés Manuel López Obrador decreed that
|
|
# the Federal District will not adopt DST.
|
|
# * 4 of 16 district leaders announced they'll ignore the decree.
|
|
# * The decree does not affect federal-controlled facilities including
|
|
# the airport, banks, hospitals, and schools.
|
|
#
|
|
# For now we'll assume that the Federal District will bow to federal rules.
|
|
|
|
# From Jesper Nørgaard (2001-04-01):
|
|
# I found some references to the Mexican application of daylight
|
|
# saving, which modifies what I had already sent you, stating earlier
|
|
# that a number of northern Mexican states would go on daylight
|
|
# saving. The modification reverts this to only cover Baja California
|
|
# (Norte), while all other states (except Sonora, who has no daylight
|
|
# saving all year) will follow the original decree of president
|
|
# Vicente Fox, starting daylight saving May 6, 2001 and ending
|
|
# September 30, 2001.
|
|
# References: "Diario de Monterrey" <http://www.diariodemonterrey.com/index.asp>
|
|
# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31)
|
|
|
|
# From Reuters (2001-09-04):
|
|
# Mexico's Supreme Court on Tuesday declared that daylight savings was
|
|
# unconstitutional in Mexico City, creating the possibility the
|
|
# capital will be in a different time zone from the rest of the nation
|
|
# next year.... The Supreme Court's ruling takes effect at 2:00
|
|
# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to
|
|
# standard time. "This is so residents of the Federal District are not
|
|
# subject to unexpected time changes," a statement from the court said.
|
|
|
|
# From Jesper Nørgaard Welen (2002-03-12):
|
|
# ... consulting my local grocery store(!) and my coworkers, they all insisted
|
|
# that a new decision had been made to reinstate US style DST in Mexico....
|
|
# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20)
|
|
# confirms this. Sonora as usual is the only state where DST is not applied.
|
|
|
|
# From Steffen Thorsen (2009-12-28):
|
|
#
|
|
# Steffen Thorsen wrote:
|
|
# > Mexico's House of Representatives has approved a proposal for northern
|
|
# > Mexico's border cities to share the same daylight saving schedule as
|
|
# > the United States.
|
|
# Now this has passed both the Congress and the Senate, so starting from
|
|
# 2010, some border regions will be the same:
|
|
# http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/
|
|
# http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939
|
|
# (Spanish)
|
|
#
|
|
# Could not find the new law text, but the proposed law text changes are here:
|
|
# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf
|
|
# (Gaceta Parlamentaria)
|
|
#
|
|
# There is also a list of the votes here:
|
|
# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html
|
|
#
|
|
# Our page:
|
|
# https://www.timeanddate.com/news/time/north-mexico-dst-change.html
|
|
|
|
# From Arthur David Olson (2010-01-20):
|
|
# The page
|
|
# http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010
|
|
# includes this text:
|
|
# En los municipios fronterizos de Tijuana y Mexicali en Baja California;
|
|
# Juárez y Ojinaga en Chihuahua; Acuña y Piedras Negras en Coahuila;
|
|
# Anáhuac en Nuevo León; y Nuevo Laredo, Reynosa y Matamoros en
|
|
# Tamaulipas, la aplicación de este horario estacional surtirá efecto
|
|
# desde las dos horas del segundo domingo de marzo y concluirá a las dos
|
|
# horas del primer domingo de noviembre.
|
|
# En los municipios fronterizos que se encuentren ubicados en la franja
|
|
# fronteriza norte en el territorio comprendido entre la línea
|
|
# internacional y la línea paralela ubicada a una distancia de veinte
|
|
# kilómetros, así como la Ciudad de Ensenada, Baja California, hacia el
|
|
# interior del país, la aplicación de este horario estacional surtirá
|
|
# efecto desde las dos horas del segundo domingo de marzo y concluirá a
|
|
# las dos horas del primer domingo de noviembre.
|
|
|
|
# From Steffen Thorsen (2014-12-08), translated by Gwillim Law:
|
|
# The Mexican state of Quintana Roo will likely change to EST in 2015.
|
|
#
|
|
# http://www.unioncancun.mx/articulo/2014/12/04/medio-ambiente/congreso-aprueba-una-hora-mas-de-sol-en-qroo
|
|
# "With this change, the time conflict that has existed between the municipios
|
|
# of Quintana Roo and the municipio of Felipe Carrillo Puerto may come to an
|
|
# end. The latter declared itself in rebellion 15 years ago when a time change
|
|
# was initiated in Mexico, and since then it has refused to change its time
|
|
# zone along with the rest of the country."
|
|
#
|
|
# From Steffen Thorsen (2015-01-14), translated by Gwillim Law:
|
|
# http://sipse.com/novedades/confirman-aplicacion-de-nueva-zona-horaria-para-quintana-roo-132331.html
|
|
# "...the new time zone will come into effect at two o'clock on the first Sunday
|
|
# of February, when we will have to advance the clock one hour from its current
|
|
# time..."
|
|
# Also, the new zone will not use DST.
|
|
#
|
|
# From Carlos Raúl Perasso (2015-02-02):
|
|
# The decree that modifies the Mexican Hour System Law has finally
|
|
# been published at the Diario Oficial de la Federación
|
|
# http://www.dof.gob.mx/nota_detalle.php?codigo=5380123&fecha=31/01/2015
|
|
# It establishes 5 zones for Mexico:
|
|
# 1- Zona Centro (Central Zone): Corresponds to longitude 90 W,
|
|
# includes most of Mexico, excluding what's mentioned below.
|
|
# 2- Zona Pacífico (Pacific Zone): Longitude 105 W, includes the
|
|
# states of Baja California Sur; Chihuahua; Nayarit (excluding Bahía
|
|
# de Banderas which lies in Central Zone); Sinaloa and Sonora.
|
|
# 3- Zona Noroeste (Northwest Zone): Longitude 120 W, includes the
|
|
# state of Baja California.
|
|
# 4- Zona Sureste (Southeast Zone): Longitude 75 W, includes the state
|
|
# of Quintana Roo.
|
|
# 5- The islands, reefs and keys shall take their timezone from the
|
|
# longitude they are located at.
|
|
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
|
|
Rule Mexico 1939 only - Feb 5 0:00 1:00 D
|
|
Rule Mexico 1939 only - Jun 25 0:00 0 S
|
|
Rule Mexico 1940 only - Dec 9 0:00 1:00 D
|
|
Rule Mexico 1941 only - Apr 1 0:00 0 S
|
|
Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War
|
|
Rule Mexico 1944 only - May 1 0:00 0 S
|
|
Rule Mexico 1950 only - Feb 12 0:00 1:00 D
|
|
Rule Mexico 1950 only - Jul 30 0:00 0 S
|
|
Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D
|
|
Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S
|
|
Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D
|
|
Rule Mexico 2001 only - Sep lastSun 2:00 0 S
|
|
Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D
|
|
Rule Mexico 2002 max - Oct lastSun 2:00 0 S
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
# Quintana Roo; represented by Cancún
|
|
Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
|
|
-6:00 - CST 1981 Dec 23
|
|
-5:00 Mexico E%sT 1998 Aug 2 2:00
|
|
-6:00 Mexico C%sT 2015 Feb 1 2:00
|
|
-5:00 - EST
|
|
# Campeche, Yucatán; represented by Mérida
|
|
Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32
|
|
-6:00 - CST 1981 Dec 23
|
|
-5:00 - EST 1982 Dec 2
|
|
-6:00 Mexico C%sT
|
|
# Coahuila, Nuevo León, Tamaulipas (near US border)
|
|
# This includes the following municipalities:
|
|
# in Coahuila: Ocampo, Acuña, Zaragoza, Jiménez, Piedras Negras, Nava,
|
|
# Guerrero, Hidalgo.
|
|
# in Nuevo León: Anáhuac, Los Aldama.
|
|
# in Tamaulipas: Nuevo Laredo, Guerrero, Mier, Miguel Alemán, Camargo,
|
|
# Gustavo Díaz Ordaz, Reynosa, Río Bravo, Valle Hermoso, Matamoros.
|
|
# See: Inicia mañana Horario de Verano en zona fronteriza, El Universal,
|
|
# 2016-03-12
|
|
# http://www.eluniversal.com.mx/articulo/estados/2016/03/12/inicia-manana-horario-de-verano-en-zona-fronteriza
|
|
Zone America/Matamoros -6:40:00 - LMT 1921 Dec 31 23:20:00
|
|
-6:00 - CST 1988
|
|
-6:00 US C%sT 1989
|
|
-6:00 Mexico C%sT 2010
|
|
-6:00 US C%sT
|
|
# Durango; Coahuila, Nuevo León, Tamaulipas (away from US border)
|
|
Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44
|
|
-6:00 - CST 1988
|
|
-6:00 US C%sT 1989
|
|
-6:00 Mexico C%sT
|
|
# Central Mexico
|
|
Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
|
|
-7:00 - MST 1927 Jun 10 23:00
|
|
-6:00 - CST 1930 Nov 15
|
|
-7:00 - MST 1931 May 1 23:00
|
|
-6:00 - CST 1931 Oct
|
|
-7:00 - MST 1932 Apr 1
|
|
-6:00 Mexico C%sT 2001 Sep 30 2:00
|
|
-6:00 - CST 2002 Feb 20
|
|
-6:00 Mexico C%sT
|
|
# Chihuahua (near US border)
|
|
# This includes the municipalities of Janos, Ascensión, Juárez, Guadalupe,
|
|
# Práxedis G Guerrero, Coyame del Sotol, Ojinaga, and Manuel Benavides.
|
|
# (See the 2016-03-12 El Universal source mentioned above.)
|
|
Zone America/Ojinaga -6:57:40 - LMT 1922 Jan 1 0:02:20
|
|
-7:00 - MST 1927 Jun 10 23:00
|
|
-6:00 - CST 1930 Nov 15
|
|
-7:00 - MST 1931 May 1 23:00
|
|
-6:00 - CST 1931 Oct
|
|
-7:00 - MST 1932 Apr 1
|
|
-6:00 - CST 1996
|
|
-6:00 Mexico C%sT 1998
|
|
-6:00 - CST 1998 Apr Sun>=1 3:00
|
|
-7:00 Mexico M%sT 2010
|
|
-7:00 US M%sT
|
|
# Chihuahua (away from US border)
|
|
Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40
|
|
-7:00 - MST 1927 Jun 10 23:00
|
|
-6:00 - CST 1930 Nov 15
|
|
-7:00 - MST 1931 May 1 23:00
|
|
-6:00 - CST 1931 Oct
|
|
-7:00 - MST 1932 Apr 1
|
|
-6:00 - CST 1996
|
|
-6:00 Mexico C%sT 1998
|
|
-6:00 - CST 1998 Apr Sun>=1 3:00
|
|
-7:00 Mexico M%sT
|
|
# Sonora
|
|
Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
|
|
-7:00 - MST 1927 Jun 10 23:00
|
|
-6:00 - CST 1930 Nov 15
|
|
-7:00 - MST 1931 May 1 23:00
|
|
-6:00 - CST 1931 Oct
|
|
-7:00 - MST 1932 Apr 1
|
|
-6:00 - CST 1942 Apr 24
|
|
-7:00 - MST 1949 Jan 14
|
|
-8:00 - PST 1970
|
|
-7:00 Mexico M%sT 1999
|
|
-7:00 - MST
|
|
|
|
# From Alexander Krivenyshev (2010-04-21):
|
|
# According to news, Bahía de Banderas (Mexican state of Nayarit)
|
|
# changed time zone UTC-7 to new time zone UTC-6 on April 4, 2010 (to
|
|
# share the same time zone as nearby city Puerto Vallarta, Jalisco).
|
|
#
|
|
# (Spanish)
|
|
# Bahía de Banderas homologa su horario al del centro del
|
|
# país, a partir de este domingo
|
|
# http://www.nayarit.gob.mx/notes.asp?id=20748
|
|
#
|
|
# Bahía de Banderas homologa su horario con el del Centro del
|
|
# País
|
|
# http://www.bahiadebanderas.gob.mx/principal/index.php?option=com_content&view=article&id=261:bahia-de-banderas-homologa-su-horario-con-el-del-centro-del-pais&catid=42:comunicacion-social&Itemid=50
|
|
#
|
|
# (English)
|
|
# Puerto Vallarta and Bahía de Banderas: One Time Zone
|
|
# http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml
|
|
# http://www.worldtimezone.com/dst_news/dst_news_mexico08.html
|
|
#
|
|
# "Mexico's Senate approved the amendments to the Mexican Schedule System that
|
|
# will allow Bahía de Banderas and Puerto Vallarta to share the same time
|
|
# zone ..."
|
|
# Baja California Sur, Nayarit, Sinaloa
|
|
|
|
# From Arthur David Olson (2010-05-01):
|
|
# Use "Bahia_Banderas" to keep the name to fourteen characters.
|
|
|
|
# Mazatlán
|
|
Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
|
|
-7:00 - MST 1927 Jun 10 23:00
|
|
-6:00 - CST 1930 Nov 15
|
|
-7:00 - MST 1931 May 1 23:00
|
|
-6:00 - CST 1931 Oct
|
|
-7:00 - MST 1932 Apr 1
|
|
-6:00 - CST 1942 Apr 24
|
|
-7:00 - MST 1949 Jan 14
|
|
-8:00 - PST 1970
|
|
-7:00 Mexico M%sT
|
|
|
|
# Bahía de Banderas
|
|
Zone America/Bahia_Banderas -7:01:00 - LMT 1921 Dec 31 23:59:00
|
|
-7:00 - MST 1927 Jun 10 23:00
|
|
-6:00 - CST 1930 Nov 15
|
|
-7:00 - MST 1931 May 1 23:00
|
|
-6:00 - CST 1931 Oct
|
|
-7:00 - MST 1932 Apr 1
|
|
-6:00 - CST 1942 Apr 24
|
|
-7:00 - MST 1949 Jan 14
|
|
-8:00 - PST 1970
|
|
-7:00 Mexico M%sT 2010 Apr 4 2:00
|
|
-6:00 Mexico C%sT
|
|
|
|
# Baja California
|
|
Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
|
|
-7:00 - MST 1924
|
|
-8:00 - PST 1927 Jun 10 23:00
|
|
-7:00 - MST 1930 Nov 15
|
|
-8:00 - PST 1931 Apr 1
|
|
-8:00 1:00 PDT 1931 Sep 30
|
|
-8:00 - PST 1942 Apr 24
|
|
-8:00 1:00 PWT 1945 Aug 14 23:00u
|
|
-8:00 1:00 PPT 1945 Nov 12 # Peace
|
|
-8:00 - PST 1948 Apr 5
|
|
-8:00 1:00 PDT 1949 Jan 14
|
|
-8:00 - PST 1954
|
|
-8:00 CA P%sT 1961
|
|
-8:00 - PST 1976
|
|
-8:00 US P%sT 1996
|
|
-8:00 Mexico P%sT 2001
|
|
-8:00 US P%sT 2002 Feb 20
|
|
-8:00 Mexico P%sT 2010
|
|
-8:00 US P%sT
|
|
# From Paul Eggert (2006-03-22):
|
|
# Formerly there was an America/Ensenada zone, which differed from
|
|
# America/Tijuana only in that it did not observe DST from 1976
|
|
# through 1995. This was as per Shanks (1999). But Shanks & Pottenger say
|
|
# Ensenada did not observe DST from 1948 through 1975. Guy Harris reports
|
|
# that the 1987 OAG says "Only Ensenada, Mexicali, San Felipe and
|
|
# Tijuana observe DST," which agrees with Shanks & Pottenger but implies that
|
|
# DST-observance was a town-by-town matter back then. This concerns
|
|
# data after 1970 so most likely there should be at least one Zone
|
|
# other than America/Tijuana for Baja, but it's not clear yet what its
|
|
# name or contents should be.
|
|
#
|
|
# From Paul Eggert (2015-10-08):
|
|
# Formerly there was an America/Santa_Isabel zone, but this appears to
|
|
# have come from a misreading of
|
|
# http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010
|
|
# It has been moved to the 'backward' file.
|
|
#
|
|
#
|
|
# Revillagigedo Is
|
|
# no information
|
|
|
|
###############################################################################
|
|
|
|
# Anguilla
|
|
# Antigua and Barbuda
|
|
# See America/Port_of_Spain.
|
|
|
|
# Bahamas
|
|
#
|
|
# For 1899 Milne gives -5:09:29.5; round that.
|
|
#
|
|
# From Sue Williams (2006-12-07):
|
|
# The Bahamas announced about a month ago that they plan to change their DST
|
|
# rules to sync with the U.S. starting in 2007....
|
|
# http://www.jonesbahamas.com/?c=45&a=10412
|
|
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
|
|
Rule Bahamas 1964 1975 - Oct lastSun 2:00 0 S
|
|
Rule Bahamas 1964 1975 - Apr lastSun 2:00 1:00 D
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Nassau -5:09:30 - LMT 1912 Mar 2
|
|
-5:00 Bahamas E%sT 1976
|
|
-5:00 US E%sT
|
|
|
|
# Barbados
|
|
|
|
# For 1899 Milne gives -3:58:29.2; round that.
|
|
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
|
|
Rule Barb 1977 only - Jun 12 2:00 1:00 D
|
|
Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
|
|
Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
|
|
Rule Barb 1979 only - Sep 30 2:00 0 S
|
|
Rule Barb 1980 only - Sep 25 2:00 0 S
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Barbados -3:58:29 - LMT 1924 # Bridgetown
|
|
-3:58:29 - BMT 1932 # Bridgetown Mean Time
|
|
-4:00 Barb A%sT
|
|
|
|
# Belize
|
|
# Whitman entirely disagrees with Shanks; go with Shanks & Pottenger.
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
|
|
Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 -0530
|
|
Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 CST
|
|
Rule Belize 1973 only - Dec 5 0:00 1:00 CDT
|
|
Rule Belize 1974 only - Feb 9 0:00 0 CST
|
|
Rule Belize 1982 only - Dec 18 0:00 1:00 CDT
|
|
Rule Belize 1983 only - Feb 12 0:00 0 CST
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Belize -5:52:48 - LMT 1912 Apr
|
|
-6:00 Belize %s
|
|
|
|
# Bermuda
|
|
|
|
# For 1899 Milne gives -4:19:18.3 as the meridian of the clock tower,
|
|
# Bermuda dockyard, Ireland I; round that.
|
|
|
|
# From Dan Jones, reporting in The Royal Gazette (2006-06-26):
|
|
|
|
# Next year, however, clocks in the US will go forward on the second Sunday
|
|
# in March, until the first Sunday in November. And, after the Time Zone
|
|
# (Seasonal Variation) Bill 2006 was passed in the House of Assembly on
|
|
# Friday, the same thing will happen in Bermuda.
|
|
# http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135
|
|
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone Atlantic/Bermuda -4:19:18 - LMT 1930 Jan 1 2:00 # Hamilton
|
|
-4:00 - AST 1974 Apr 28 2:00
|
|
-4:00 Canada A%sT 1976
|
|
-4:00 US A%sT
|
|
|
|
# Cayman Is
|
|
# See America/Panama.
|
|
|
|
# Costa Rica
|
|
|
|
# Milne gives -5:36:13.3 as San José mean time; round to nearest.
|
|
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
|
|
Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
|
|
Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
|
|
Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
|
|
# IATA SSIM (1991-09) says the following was at 1:00;
|
|
# go with Shanks & Pottenger.
|
|
Rule CR 1991 only - Jul 1 0:00 0 S
|
|
Rule CR 1992 only - Mar 15 0:00 0 S
|
|
# There are too many San Josés elsewhere, so we'll use 'Costa Rica'.
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Costa_Rica -5:36:13 - LMT 1890 # San José
|
|
-5:36:13 - SJMT 1921 Jan 15 # San José Mean Time
|
|
-6:00 CR C%sT
|
|
# Coco
|
|
# no information; probably like America/Costa_Rica
|
|
|
|
# Cuba
|
|
|
|
# From Paul Eggert (2013-02-21):
|
|
# Milne gives -5:28:50.45 for the observatory at Havana, -5:29:23.57
|
|
# for the port, and -5:30 for meteorological observations.
|
|
# For now, stick with Shanks & Pottenger.
|
|
|
|
# From Arthur David Olson (1999-03-29):
|
|
# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
|
|
# the Cuban National Team and the Baltimore Orioles was carried live on
|
|
# the Orioles Radio Network, including affiliate WTOP in Washington, DC.
|
|
# During the game, play-by-play announcer Jim Hunter noted that
|
|
# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving
|
|
# Time today." (The "two hour" remark referred to losing one hour of
|
|
# sleep on 1999-03-28 - when the announcers were in Cuba as it switched
|
|
# to DST - and one more hour on 1999-04-04 - when the announcers will have
|
|
# returned to Baltimore, which switches on that date.)
|
|
|
|
# From Steffen Thorsen (2013-11-11):
|
|
# DST start in Cuba in 2004 ... does not follow the same rules as the
|
|
# years before. The correct date should be Sunday 2004-03-28 00:00 ...
|
|
# https://web.archive.org/web/20040402060750/http://www.granma.cu/espanol/2004/marzo/sab27/reloj.html
|
|
|
|
# From Evert van der Veer via Steffen Thorsen (2004-10-28):
|
|
# Cuba is not going back to standard time this year.
|
|
# From Paul Eggert (2006-03-22):
|
|
# http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html
|
|
# says that it's due to a problem at the Antonio Guiteras
|
|
# thermoelectric plant, and says "This October there will be no return
|
|
# to normal hours (after daylight saving time)".
|
|
# For now, let's assume that it's a temporary measure.
|
|
|
|
# From Carlos A. Carnero Delgado (2005-11-12):
|
|
# This year (just like in 2004-2005) there's no change in time zone
|
|
# adjustment in Cuba. We will stay in daylight saving time:
|
|
# http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html
|
|
|
|
# From Jesper Nørgaard Welen (2006-10-21):
|
|
# An article in GRANMA INTERNACIONAL claims that Cuba will end
|
|
# the 3 years of permanent DST next weekend, see
|
|
# http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html
|
|
# "On Saturday night, October 28 going into Sunday, October 29, at 01:00,
|
|
# watches should be set back one hour - going back to 00:00 hours - returning
|
|
# to the normal schedule....
|
|
|
|
# From Paul Eggert (2007-03-02):
|
|
# <http://www.granma.cubaweb.cu/english/news/art89.html>, dated yesterday,
|
|
# says Cuban clocks will advance at midnight on March 10.
|
|
# For lack of better information, assume Cuba will use US rules,
|
|
# except that it switches at midnight standard time as usual.
|
|
#
|
|
# From Steffen Thorsen (2007-10-25):
|
|
# Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week
|
|
# earlier - on the last Sunday of October, just like in 2006.
|
|
#
|
|
# He supplied these references:
|
|
#
|
|
# http://www.prensalatina.com.mx/article.asp?ID=%7B4CC32C1B-A9F7-42FB-8A07-8631AFC923AF%7D&language=ES
|
|
# http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm
|
|
#
|
|
# From Alex Krivenyshev (2007-10-25):
|
|
# Here is also article from Granma (Cuba):
|
|
#
|
|
# Regirá el Horario Normal desde el próximo domingo 28 de octubre
|
|
# http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html
|
|
#
|
|
# http://www.worldtimezone.com/dst_news/dst_news_cuba03.html
|
|
|
|
# From Arthur David Olson (2008-03-09):
|
|
# I'm in Maryland which is now observing United States Eastern Daylight
|
|
# Time. At 9:44 local time I used RealPlayer to listen to
|
|
# http://media.enet.cu/radioreloj
|
|
# a Cuban information station, and heard
|
|
# the time announced as "ocho cuarenta y cuatro" ("eight forty-four"),
|
|
# indicating that Cuba is still on standard time.
|
|
|
|
# From Steffen Thorsen (2008-03-12):
|
|
# It seems that Cuba will start DST on Sunday, 2007-03-16...
|
|
# It was announced yesterday, according to this source (in Spanish):
|
|
# http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm
|
|
#
|
|
# Some more background information is posted here:
|
|
# https://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html
|
|
#
|
|
# The article also says that Cuba has been observing DST since 1963,
|
|
# while Shanks (and tzdata) has 1965 as the first date (except in the
|
|
# 1940's). Many other web pages in Cuba also claim that it has been
|
|
# observed since 1963, but with the exception of 1970 - an exception
|
|
# which is not present in tzdata/Shanks. So there is a chance we need to
|
|
# change some historic records as well.
|
|
#
|
|
# One example:
|
|
# http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm
|
|
|
|
# From Jesper Nørgaard Welen (2008-03-13):
|
|
# The Cuban time change has just been confirmed on the most authoritative
|
|
# web site, the Granma. Please check out
|
|
# http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html
|
|
#
|
|
# Basically as expected after Steffen Thorsen's information, the change
|
|
# will take place midnight between Saturday and Sunday.
|
|
|
|
# From Arthur David Olson (2008-03-12):
|
|
# Assume Sun>=15 (third Sunday) going forward.
|
|
|
|
# From Alexander Krivenyshev (2009-03-04)
|
|
# According to the Radio Reloj - Cuba will start Daylight Saving Time on
|
|
# midnight between Saturday, March 07, 2009 and Sunday, March 08, 2009-
|
|
# not on midnight March 14 / March 15 as previously thought.
|
|
#
|
|
# http://www.worldtimezone.com/dst_news/dst_news_cuba05.html
|
|
# (in Spanish)
|
|
|
|
# From Arthur David Olson (2009-03-09)
|
|
# I listened over the Internet to
|
|
# http://media.enet.cu/readioreloj
|
|
# this morning; when it was 10:05 a. m. here in Bethesda, Maryland the
|
|
# the time was announced as "diez cinco" - the same time as here, indicating
|
|
# that has indeed switched to DST. Assume second Sunday from 2009 forward.
|
|
|
|
# From Steffen Thorsen (2011-03-08):
|
|
# Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00
|
|
# this year. Nothing about the end date known so far (if that has
|
|
# changed at all).
|
|
#
|
|
# Source:
|
|
# http://granma.co.cu/2011/03/08/nacional/artic01.html
|
|
#
|
|
# Our info:
|
|
# https://www.timeanddate.com/news/time/cuba-starts-dst-2011.html
|
|
#
|
|
# From Steffen Thorsen (2011-10-30)
|
|
# Cuba will end DST two weeks later this year. Instead of going back
|
|
# tonight, it has been delayed to 2011-11-13 at 01:00.
|
|
#
|
|
# One source (Spanish)
|
|
# http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html
|
|
#
|
|
# Our page:
|
|
# https://www.timeanddate.com/news/time/cuba-time-changes-2011.html
|
|
#
|
|
# From Steffen Thorsen (2012-03-01)
|
|
# According to Radio Reloj, Cuba will start DST on Midnight between March
|
|
# 31 and April 1.
|
|
#
|
|
# Radio Reloj has the following info (Spanish):
|
|
# http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril
|
|
#
|
|
# Our info on it:
|
|
# https://www.timeanddate.com/news/time/cuba-starts-dst-2012.html
|
|
|
|
# From Steffen Thorsen (2012-11-03):
|
|
# Radio Reloj and many other sources report that Cuba is changing back
|
|
# to standard time on 2012-11-04:
|
|
# http://www.radioreloj.cu/index.php/noticias-radio-reloj/36-nacionales/9961-regira-horario-normal-en-cuba-desde-el-domingo-cuatro-de-noviembre
|
|
# From Paul Eggert (2012-11-03):
|
|
# For now, assume the future rule is first Sunday in November.
|
|
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
|
|
Rule Cuba 1928 only - Jun 10 0:00 1:00 D
|
|
Rule Cuba 1928 only - Oct 10 0:00 0 S
|
|
Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
|
|
Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
|
|
Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
|
|
Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
|
|
Rule Cuba 1965 only - Jun 1 0:00 1:00 D
|
|
Rule Cuba 1965 only - Sep 30 0:00 0 S
|
|
Rule Cuba 1966 only - May 29 0:00 1:00 D
|
|
Rule Cuba 1966 only - Oct 2 0:00 0 S
|
|
Rule Cuba 1967 only - Apr 8 0:00 1:00 D
|
|
Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
|
|
Rule Cuba 1968 only - Apr 14 0:00 1:00 D
|
|
Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
|
|
Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
|
|
Rule Cuba 1972 1974 - Oct 8 0:00 0 S
|
|
Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
|
|
Rule Cuba 1978 only - May 7 0:00 1:00 D
|
|
Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S
|
|
Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
|
|
Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
|
|
Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
|
|
Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D
|
|
Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
|
|
Rule Cuba 1996 only - Oct 6 0:00s 0 S
|
|
Rule Cuba 1997 only - Oct 12 0:00s 0 S
|
|
Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D
|
|
Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S
|
|
Rule Cuba 2000 2003 - Apr Sun>=1 0:00s 1:00 D
|
|
Rule Cuba 2004 only - Mar lastSun 0:00s 1:00 D
|
|
Rule Cuba 2006 2010 - Oct lastSun 0:00s 0 S
|
|
Rule Cuba 2007 only - Mar Sun>=8 0:00s 1:00 D
|
|
Rule Cuba 2008 only - Mar Sun>=15 0:00s 1:00 D
|
|
Rule Cuba 2009 2010 - Mar Sun>=8 0:00s 1:00 D
|
|
Rule Cuba 2011 only - Mar Sun>=15 0:00s 1:00 D
|
|
Rule Cuba 2011 only - Nov 13 0:00s 0 S
|
|
Rule Cuba 2012 only - Apr 1 0:00s 1:00 D
|
|
Rule Cuba 2012 max - Nov Sun>=1 0:00s 0 S
|
|
Rule Cuba 2013 max - Mar Sun>=8 0:00s 1:00 D
|
|
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Havana -5:29:28 - LMT 1890
|
|
-5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT
|
|
-5:00 Cuba C%sT
|
|
|
|
# Dominica
|
|
# See America/Port_of_Spain.
|
|
|
|
# Dominican Republic
|
|
|
|
# From Steffen Thorsen (2000-10-30):
|
|
# Enrique Morales reported to me that the Dominican Republic has changed the
|
|
# time zone to Eastern Standard Time as of Sunday 29 at 2 am....
|
|
# http://www.listin.com.do/antes/261000/republica/princi.html
|
|
|
|
# From Paul Eggert (2000-12-04):
|
|
# That URL (2000-10-26, in Spanish) says they planned to use US-style DST.
|
|
|
|
# From Rives McDow (2000-12-01):
|
|
# Dominican Republic changed its mind and presidential decree on Tuesday,
|
|
# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the
|
|
# Dominican Republic will be reverting to 8 hours from the International Date
|
|
# Line, and will not be using DST in the foreseeable future. The reason they
|
|
# decided to use DST was to be in synch with Puerto Rico, who was also going
|
|
# to implement DST. When Puerto Rico didn't implement DST, the president
|
|
# decided to revert.
|
|
|
|
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
|
|
Rule DR 1966 only - Oct 30 0:00 1:00 EDT
|
|
Rule DR 1967 only - Feb 28 0:00 0 EST
|
|
Rule DR 1969 1973 - Oct lastSun 0:00 0:30 -0430
|
|
Rule DR 1970 only - Feb 21 0:00 0 EST
|
|
Rule DR 1971 only - Jan 20 0:00 0 EST
|
|
Rule DR 1972 1974 - Jan 21 0:00 0 EST
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Santo_Domingo -4:39:36 - LMT 1890
|
|
-4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
|
|
-5:00 DR %s 1974 Oct 27
|
|
-4:00 - AST 2000 Oct 29 2:00
|
|
-5:00 US E%sT 2000 Dec 3 1:00
|
|
-4:00 - AST
|
|
|
|
# El Salvador
|
|
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
|
|
Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
|
|
Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
|
|
# There are too many San Salvadors elsewhere, so use America/El_Salvador
|
|
# instead of America/San_Salvador.
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
|
|
-6:00 Salv C%sT
|
|
|
|
# Grenada
|
|
# Guadeloupe
|
|
# St Barthélemy
|
|
# St Martin (French part)
|
|
# See America/Port_of_Spain.
|
|
|
|
# Guatemala
|
|
#
|
|
# From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen:
|
|
# Diario Co Latino, at
|
|
# <http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079>,
|
|
# says in an article dated 2006-04-19 that the Guatemalan government had
|
|
# decided on that date to advance official time by 60 minutes, to lessen the
|
|
# impact of the elevated cost of oil.... Daylight saving time will last from
|
|
# 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified).
|
|
# From Paul Eggert (2006-06-22):
|
|
# The Ministry of Energy and Mines, press release CP-15/2006
|
|
# (2006-04-19), says DST ends at 24:00. See
|
|
# http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf
|
|
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
|
|
Rule Guat 1973 only - Nov 25 0:00 1:00 D
|
|
Rule Guat 1974 only - Feb 24 0:00 0 S
|
|
Rule Guat 1983 only - May 21 0:00 1:00 D
|
|
Rule Guat 1983 only - Sep 22 0:00 0 S
|
|
Rule Guat 1991 only - Mar 23 0:00 1:00 D
|
|
Rule Guat 1991 only - Sep 7 0:00 0 S
|
|
Rule Guat 2006 only - Apr 30 0:00 1:00 D
|
|
Rule Guat 2006 only - Oct 1 0:00 0 S
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
|
|
-6:00 Guat C%sT
|
|
|
|
# Haiti
|
|
# From Gwillim Law (2005-04-15):
|
|
# Risto O. Nykänen wrote me that Haiti is now on DST.
|
|
# I searched for confirmation, and I found a press release
|
|
# on the Web page of the Haitian Consulate in Chicago (2005-03-31),
|
|
# <http://www.haitianconsulate.org/time.doc>. Translated from French, it says:
|
|
#
|
|
# "The Prime Minister's Communication Office notifies the public in general
|
|
# and the press in particular that, following a decision of the Interior
|
|
# Ministry and the Territorial Collectivities [I suppose that means the
|
|
# provinces], Haiti will move to Eastern Daylight Time in the night from next
|
|
# Saturday the 2nd to Sunday the 3rd.
|
|
#
|
|
# "Consequently, the Prime Minister's Communication Office wishes to inform
|
|
# the population that the country's clocks will be set forward one hour
|
|
# starting at midnight. This provision will hold until the last Saturday in
|
|
# October 2005.
|
|
#
|
|
# "Port-au-Prince, March 31, 2005"
|
|
#
|
|
# From Steffen Thorsen (2006-04-04):
|
|
# I have been informed by users that Haiti observes DST this year like
|
|
# last year, so the current "only" rule for 2005 might be changed to a
|
|
# "max" rule or to last until 2006. (Who knows if they will observe DST
|
|
# next year or if they will extend their DST like US/Canada next year).
|
|
#
|
|
# I have found this article about it (in French):
|
|
# http://www.haitipressnetwork.com/news.cfm?articleID=7612
|
|
#
|
|
# The reason seems to be an energy crisis.
|
|
|
|
# From Stephen Colebourne (2007-02-22):
|
|
# Some IATA info: Haiti won't be having DST in 2007.
|
|
|
|
# From Steffen Thorsen (2012-03-11):
|
|
# According to several news sources, Haiti will observe DST this year,
|
|
# apparently using the same start and end date as USA/Canada.
|
|
# So this means they have already changed their time.
|
|
#
|
|
# http://www.alterpresse.org/spip.php?article12510
|
|
# http://radiovision2000haiti.net/home/?p=13253
|
|
#
|
|
# From Arthur David Olson (2012-03-11):
|
|
# The alterpresse.org source seems to show a US-style leap from 2:00 a.m. to
|
|
# 3:00 a.m. rather than the traditional Haitian jump at midnight.
|
|
# Assume a US-style fall back as well.
|
|
|
|
# From Steffen Thorsen (2013-03-10):
|
|
# It appears that Haiti is observing DST this year as well, same rules
|
|
# as US/Canada. They did it last year as well, and it looks like they
|
|
# are going to observe DST every year now...
|
|
#
|
|
# http://radiovision2000haiti.net/public/haiti-avis-changement-dheure-dimanche/
|
|
# http://www.canalplushaiti.net/?p=6714
|
|
|
|
# From Steffen Thorsen (2016-03-12):
|
|
# Jean Antoine, editor of www.haiti-reference.com informed us that Haiti
|
|
# are not going on DST this year. Several other resources confirm this: ...
|
|
# https://www.radiotelevisioncaraibes.com/presse/heure_d_t_pas_de_changement_d_heure_pr_vu_pour_cet_ann_e.html
|
|
# https://www.vantbefinfo.com/changement-dheure-pas-pour-haiti/
|
|
# http://news.anmwe.com/haiti-lheure-nationale-ne-sera-ni-avancee-ni-reculee-cette-annee/
|
|
|
|
# From Steffen Thorsen (2017-03-12):
|
|
# We have received 4 mails from different people telling that Haiti
|
|
# has started DST again today, and this source seems to confirm that,
|
|
# I have not been able to find a more authoritative source:
|
|
# https://www.haitilibre.com/en/news-20319-haiti-notices-time-change-in-haiti.html
|
|
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
|
|
Rule Haiti 1983 only - May 8 0:00 1:00 D
|
|
Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
|
|
Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
|
|
# Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s.
|
|
# Go with IATA.
|
|
Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D
|
|
Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
|
|
Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D
|
|
Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S
|
|
Rule Haiti 2012 2015 - Mar Sun>=8 2:00 1:00 D
|
|
Rule Haiti 2012 2015 - Nov Sun>=1 2:00 0 S
|
|
Rule Haiti 2017 max - Mar Sun>=8 2:00 1:00 D
|
|
Rule Haiti 2017 max - Nov Sun>=1 2:00 0 S
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Port-au-Prince -4:49:20 - LMT 1890
|
|
-4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
|
|
-5:00 Haiti E%sT
|
|
|
|
# Honduras
|
|
# Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1.
|
|
|
|
# From Paul Eggert (2006-05-05):
|
|
# worldtimezone.com reports a 2006-05-02 Spanish-language AP article
|
|
# saying Honduras will start using DST midnight Saturday, effective 4
|
|
# months until September. La Tribuna reported today
|
|
# <http://www.latribuna.hn/99299.html> that Manuel Zelaya, the president
|
|
# of Honduras, refused to back down on this.
|
|
|
|
# From Jesper Nørgaard Welen (2006-08-08):
|
|
# It seems that Honduras has returned from DST to standard time this Monday at
|
|
# 00:00 hours (prolonging Sunday to 25 hours duration).
|
|
# http://www.worldtimezone.com/dst_news/dst_news_honduras04.html
|
|
|
|
# From Paul Eggert (2006-08-08):
|
|
# Also see Diario El Heraldo, The country returns to standard time (2006-08-08).
|
|
# http://www.elheraldo.hn/nota.php?nid=54941&sec=12
|
|
# It mentions executive decree 18-2006.
|
|
|
|
# From Steffen Thorsen (2006-08-17):
|
|
# Honduras will observe DST from 2007 to 2009, exact dates are not
|
|
# published, I have located this authoritative source:
|
|
# http://www.presidencia.gob.hn/noticia.aspx?nId=47
|
|
|
|
# From Steffen Thorsen (2007-03-30):
|
|
# http://www.laprensahn.com/pais_nota.php?id04962=7386
|
|
# So it seems that Honduras will not enter DST this year....
|
|
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
|
|
Rule Hond 1987 1988 - May Sun>=1 0:00 1:00 D
|
|
Rule Hond 1987 1988 - Sep lastSun 0:00 0 S
|
|
Rule Hond 2006 only - May Sun>=1 0:00 1:00 D
|
|
Rule Hond 2006 only - Aug Mon>=1 0:00 0 S
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
|
|
-6:00 Hond C%sT
|
|
#
|
|
# Great Swan I ceded by US to Honduras in 1972
|
|
|
|
# Jamaica
|
|
# Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an
|
|
# unspecified official document, and says "This time is used throughout the
|
|
# island". Go with Milne. Round to the nearest second as required by zic.
|
|
#
|
|
# Shanks & Pottenger give April 28 for the 1974 spring-forward transition, but
|
|
# Lance Neita writes that Prime Minister Michael Manley decreed it January 5.
|
|
# Assume Neita meant Jan 6 02:00, the same as the US. Neita also writes that
|
|
# Manley's supporters associated this act with Manley's nickname "Joshua"
|
|
# (recall that in the Bible the sun stood still at Joshua's request),
|
|
# and with the Rod of Correction which Manley said he had received from
|
|
# Haile Selassie, Emperor of Ethiopia. See:
|
|
# Neita L. The politician in all of us. Jamaica Observer 2014-09-20
|
|
# http://www.jamaicaobserver.com/columns/The-politician-in-all-of-us_17573647
|
|
#
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Jamaica -5:07:10 - LMT 1890 # Kingston
|
|
-5:07:10 - KMT 1912 Feb # Kingston Mean Time
|
|
-5:00 - EST 1974
|
|
-5:00 US E%sT 1984
|
|
-5:00 - EST
|
|
|
|
# Martinique
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
|
|
-4:04:20 - FFMT 1911 May # Fort-de-France MT
|
|
-4:00 - AST 1980 Apr 6
|
|
-4:00 1:00 ADT 1980 Sep 28
|
|
-4:00 - AST
|
|
|
|
# Montserrat
|
|
# See America/Port_of_Spain.
|
|
|
|
# Nicaragua
|
|
#
|
|
# This uses Shanks & Pottenger for times before 2005.
|
|
#
|
|
# From Steffen Thorsen (2005-04-12):
|
|
# I've got reports from 8 different people that Nicaragua just started
|
|
# DST on Sunday 2005-04-10, in order to save energy because of
|
|
# expensive petroleum. The exact end date for DST is not yet
|
|
# announced, only "September" but some sites also say "mid-September".
|
|
# Some background information is available on the President's official site:
|
|
# http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm
|
|
# The Decree, no 23-2005 is available here:
|
|
# http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2005/Decreto%2023-2005%20Se%20adelanta%20en%20una%20hora%20en%20todo%20el%20territorio%20nacional%20apartir%20de%20las%2024horas%20del%2009%20de%20Abril.pdf
|
|
#
|
|
# From Paul Eggert (2005-05-01):
|
|
# The decree doesn't say anything about daylight saving, but for now let's
|
|
# assume that it is daylight saving....
|
|
#
|
|
# From Gwillim Law (2005-04-21):
|
|
# The Associated Press story on the time change, which can be found at
|
|
# http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html
|
|
# and elsewhere, says (fifth paragraph, translated from Spanish): "The last
|
|
# time that a change of clocks was applied to save energy was in the year 2000
|
|
# during the Arnoldo Alemán administration."...
|
|
# The northamerica file says that Nicaragua has been on UTC-6 continuously
|
|
# since December 1998. I wasn't able to find any details of Nicaraguan time
|
|
# changes in 2000. Perhaps a note could be added to the northamerica file, to
|
|
# the effect that we have indirect evidence that DST was observed in 2000.
|
|
#
|
|
# From Jesper Nørgaard Welen (2005-11-02):
|
|
# Nicaragua left DST the 2005-10-02 at 00:00 (local time).
|
|
# http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm
|
|
# (2005-09-26)
|
|
#
|
|
# From Jesper Nørgaard Welen (2006-05-05):
|
|
# http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410
|
|
# (my informal translation)
|
|
# By order of the president of the republic, Enrique Bolaños, Nicaragua
|
|
# advanced by sixty minutes their official time, yesterday at 2 in the
|
|
# morning, and will stay that way until 30th of September.
|
|
#
|
|
# From Jesper Nørgaard Welen (2006-09-30):
|
|
# http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf
|
|
# My informal translation runs:
|
|
# The natural sun time is restored in all the national territory, in that the
|
|
# time is returned one hour at 01:00 am of October 1 of 2006.
|
|
#
|
|
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
|
|
Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
|
|
Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
|
|
Rule Nic 2005 only - Apr 10 0:00 1:00 D
|
|
Rule Nic 2005 only - Oct Sun>=1 0:00 0 S
|
|
Rule Nic 2006 only - Apr 30 2:00 1:00 D
|
|
Rule Nic 2006 only - Oct Sun>=1 1:00 0 S
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Managua -5:45:08 - LMT 1890
|
|
-5:45:12 - MMT 1934 Jun 23 # Managua Mean Time?
|
|
-6:00 - CST 1973 May
|
|
-5:00 - EST 1975 Feb 16
|
|
-6:00 Nic C%sT 1992 Jan 1 4:00
|
|
-5:00 - EST 1992 Sep 24
|
|
-6:00 - CST 1993
|
|
-5:00 - EST 1997
|
|
-6:00 Nic C%sT
|
|
|
|
# Panama
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Panama -5:18:08 - LMT 1890
|
|
-5:19:36 - CMT 1908 Apr 22 # Colón Mean Time
|
|
-5:00 - EST
|
|
Link America/Panama America/Cayman
|
|
|
|
# Puerto Rico
|
|
# There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'.
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
|
|
-4:00 - AST 1942 May 3
|
|
-4:00 US A%sT 1946
|
|
-4:00 - AST
|
|
|
|
# St Kitts-Nevis
|
|
# St Lucia
|
|
# See America/Port_of_Spain.
|
|
|
|
# St Pierre and Miquelon
|
|
# There are too many St Pierres elsewhere, so we'll use 'Miquelon'.
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
|
|
-4:00 - AST 1980 May
|
|
-3:00 - -03 1987
|
|
-3:00 Canada -03/-02
|
|
|
|
# St Vincent and the Grenadines
|
|
# See America/Port_of_Spain.
|
|
|
|
# Turks and Caicos
|
|
#
|
|
# From Chris Dunn in
|
|
# https://bugs.debian.org/415007
|
|
# (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the
|
|
# daylight saving dates for time changes have been adjusted to match
|
|
# the recent U.S. change of dates.
|
|
#
|
|
# From Brian Inglis (2007-04-28):
|
|
# http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26]
|
|
# there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three
|
|
# rows before that there is an out of date entry for Oct:
|
|
# "Eastern Standard Times Begins 2007
|
|
# Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time"
|
|
# indicating that the normal ET rules are followed.
|
|
#
|
|
# From Paul Eggert (2014-08-19):
|
|
# The 2014-08-13 Cabinet meeting decided to stay on UT -04 year-round. See:
|
|
# http://tcweeklynews.com/daylight-savings-time-to-be-maintained-p5353-127.htm
|
|
# Model this as a switch from EST/EDT to AST ...
|
|
# From Chris Walton (2014-11-04):
|
|
# ... the TCI government appears to have delayed the switch to
|
|
# "permanent daylight saving time" by one year....
|
|
# http://tcweeklynews.com/time-change-to-go-ahead-this-november-p5437-127.htm
|
|
#
|
|
# From the Turks & Caicos Cabinet (2017-07-20), heads-up from Steffen Thorsen:
|
|
# ... agreed to the reintroduction in TCI of Daylight Saving Time (DST)
|
|
# during the summer months and Standard Time, also known as Local
|
|
# Time, during the winter months with effect from April 2018 ...
|
|
# https://www.gov.uk/government/news/turks-and-caicos-post-cabinet-meeting-statement--3
|
|
#
|
|
# From Paul Eggert (2017-08-26):
|
|
# The date of effect of the spring 2018 change appears to be March 11,
|
|
# which makes more sense. See: Hamilton D. Time change back
|
|
# by March 2018 for TCI. Magnetic Media. 2017-08-25.
|
|
# http://magneticmediatv.com/2017/08/time-change-back-by-march-2018-for-tci/
|
|
#
|
|
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
|
|
Zone America/Grand_Turk -4:44:32 - LMT 1890
|
|
-5:07:10 - KMT 1912 Feb # Kingston Mean Time
|
|
-5:00 - EST 1979
|
|
-5:00 US E%sT 2015 Nov Sun>=1 2:00
|
|
-4:00 - AST 2018 Mar 11 3:00
|
|
-5:00 US E%sT
|
|
|
|
# British Virgin Is
|
|
# Virgin Is
|
|
# See America/Port_of_Spain.
|
|
|
|
|
|
# Local Variables:
|
|
# coding: utf-8
|
|
# End:
|