322 lines
12 KiB
Plaintext
322 lines
12 KiB
Plaintext
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# @(#)northamerica 4.8
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###############################################################################
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# United States
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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, October 26, 1974
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# and Sunday, October 27, 1974 editions of the Washington Post.
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# From seismo!munnari!kre:
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# I recall also being told by someone once that Canada didn't have
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# the DST variations in 74/75 that the US did, but I am not nearly
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# sure enough of this to add anything.
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# From Arthur David Olson:
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# The above has been confirmed by Bob Devine; we'll go with it here.
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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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# 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 - Sep 30 2:00 0 S
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Rule US 1967 max - 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 max - Apr Sun>=1 2:00 1:00 D
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# From Bob Devine (January 28, 1988):
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# ...Alaska (and Hawaii) had the timezone names changed in 1967.
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# old new
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# Pacific Standard Time(PST) -same-
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# Yukon Standard Time(YST) -same-
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# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
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# Nome Standard Time (NT) Bering Standard Time (BST)
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#
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# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
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# The YST zone now covers nearly all of the state, AHST just part
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# of the Aleutian islands. No DST.
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# From U. S. Naval Observatory (January 19, 1989):
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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 (January 21, 1989):
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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 (February 13, 1988):
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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 April 1, 1967 (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 April 1, 1967 until November 30, 1983 (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 November 30, 1983:
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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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# Easy stuff first--including Alaska, where we ignore history (since we
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# can't tell if we should give Yukon time or Alaska-Hawaii time for "old"
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# times).
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# Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL]
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Zone US/Eastern -5:00 US E%sT
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Zone US/Central -6:00 US C%sT
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Zone US/Mountain -7:00 US M%sT
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Zone US/Pacific -8:00 US P%sT
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Zone US/Alaska -9:00 US AK%sT # Abbreviation per USNO
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# Mainland US areas that are always Standard as of 1986.
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Zone US/East-Indiana -5:00 US E%sT 1946
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-5:00 - EST # Always EST as of 1986
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Zone US/Arizona -7:00 US M%sT 1946
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-7:00 - MST # Always MST as of 1986
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# From Arthur David Olson (February 13, 1988):
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# However. . .a writer from the Inter Tribal Council of Arizona, Inc.,
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# notes in private correspondence dated 12/28/87 that "Presently, only the
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# Navajo Nation participates in the Daylight Saving Time policy, due to its
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# large size and location in three states." (The "only" means that other
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# tribal nations don't use DST.)
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Link US/Mountain Navajo
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# From Bob Devine (January 28, 1988):
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# Michigan didn't observe DST from 1968 to 1973.
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Zone US/Michigan -5:00 US E%sT 1968
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-5:00 - EST 1973
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-5:00 US E%sT
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# Samoa just changes names. No DST, per Naval Observatory.
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Zone US/Samoa -11:00 - NST 1967 Apr 1 # N=Nome
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-11:00 - BST 1983 Nov 30 # B=Bering
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-11:00 - SST # S=Samoa
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# Aleutian has a name change. DST, per Naval Observatory.
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Zone US/Aleutian -10:00 US AH%sT 1983 Nov 30
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-10:00 US HA%sT
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# From Arthur David Olson:
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# And then there's Hawaii.
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# DST was observed for one day in 1933;
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# Standard time was change by half an hour in 1947;
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# it's always standard as of 1986.
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Zone US/Hawaii -10:30 US H%sT 1933 Apr 30 2:00
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-10:30 1:00 HDT 1933 May 1 2:00
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-10:30 US H%sT 1947 Jun 8 2:00
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-10:00 - HST
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# Old names, for S5 users
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# Link LINK-FROM LINK-TO
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# Link US/Eastern EST5EDT
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# Link US/Central CST6CDT
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# Link US/Mountain MST7MDT
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# Link US/Pacific PST8PDT
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# Link US/East-Indiana EST
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# Link US/Arizona MST
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# Link US/Hawaii HST
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################################################################################
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# Canada
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# Canada is reportedly lots easier than the US--leastways since 1951.
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# I don't know what they did before then.
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# 4.3BSD claims that it's perfectly regular.
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# According to a posting in "comp.bugs.misc", "comp.unix.wizards", etc.
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# on February 8, 1987, by Dave Sherman of the Law Society of Upper Canada,
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# "...Canada (well, Ontario and at least some of the other provinces) are
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# adopting the new daylight savings time rules...". We assume all of
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# Canada is doing so.
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# From Bob Devine (January 28, 1988):
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# All of Canada did have DST from your first rule except Saskatchewan.
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# Which parts did not observe DST is hard to pinpoint but most of the
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# province follows the rules.
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# NOTE: those that didn't have DST for that rule, also
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# probably did not have it for several years previous.
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# From U. S. Naval Observatory (January 19, 1989):
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# CANADA NEW FDL 3.5H BEHIND UTC ST.JOHN'S
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# CANADA NEW FDL 1.5H BEHIND UTC APR 3 - OCT 29
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# CANADA ATLANTIC 4 H BEHIND UTC HALIFAX
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# CANADA ATLANTIC 3 H BEHIND UTC APR 3 - OCT 29
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# CANADA EASTERN 5 H BEHIND UTC TORONTO, MONTREAL, OTTAWA
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# CANADA EASTERN 4 H BEHIND UTC APR 3 - OCT 29
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# CANADA CENTRAL 6 H BEHIND UTC REGINA, WINNIPEG
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# CANADA CENTRAL 5 H BEHIND UTC APR 3 - OCT 29
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# CANADA MOUNTAIN 7 H BEHIND UTC CALGARY, EDMONTON
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# CANADA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 29
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# CANADA PACIFIC 8 H BEHIND UTC VANCOUVER
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# CANADA PACIFIC 7 H BEHIND UTC APR 3 - OCT 29
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# CANADA YUKON SAME AS PACIFIC DAWSON
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# From Arthur David Olson (January 21, 1989):
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# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
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# Note claim that there's double DST in Newfoundland and that Yukon should
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# be same as Pacific. Stick with rules posted in 1988 until more authoritative
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# information is available.
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# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
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Rule Canada 1969 max - Oct lastSun 2:00 0 S
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Rule Canada 1969 1986 - Apr lastSun 2:00 1:00 D
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Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D
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# Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL]
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# Bob Devine says that DST *is* observed in Newfoundland
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Zone Canada/Newfoundland -3:30 Canada N%sT
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Zone Canada/Atlantic -4:00 Canada A%sT
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Zone Canada/Eastern -5:00 Canada E%sT
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Zone Canada/Central -6:00 Canada C%sT
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Zone Canada/East-Saskatchewan -6:00 - CST # No DST as of 1987
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Zone Canada/Mountain -7:00 Canada M%sT
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Zone Canada/Pacific -8:00 Canada P%sT
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Zone Canada/Yukon -9:00 Canada Y%sT
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###############################################################################
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# Mexico
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# From Guy Harris:
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# Rules are from the Official Airline Guide, Worldwide Edition, for 1987.
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# Rules prior to 1987 are unknown.
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# The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana
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# observe DST." This is presumably Baja California Norte, above 28th parallel,
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# as listed there; Mexico/BajaSur is for "Baja California Sur and N. Pacific
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# Coast (States of Sinaloa and Sonora)."
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# From Bob Devine (January 28, 1988):
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# The Federal District (where Mexico City is) has observed [DST] several
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# times but not recently.
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#
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# I don't where to drawn the line in the North Baja area. 28th latitude
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# sounds good -- but it may be higher (how far [d]o radio stations from
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# San Diego affect culture?).
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#
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# The dates of DST probably go back to 1981. The rules are the same as
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# US's. This is going to be a headache for US presidential electi[o]n years!
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# From Arthur David Olson (February 13, 1988)
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# Since the 1981 starting date is only "probable," we'll keep the 1987
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# starting date below.
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# From U. S. Naval Observatory (January 19, 1989):
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# MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND
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# MEXICO BAJA CAL N N. PACIFIC COAST (STATES
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# MEXICO BAJA CAL N OF SINALOA AND SONORA)
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# MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLAL APR 3
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# MEXICO BAJA CAL N - OCT 29
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# MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLAL APR 3
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# MEXICO BAJA CAL N - 0CT 29
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# MEXICO 6 H BEHIND UTC STATES OF DURANGO,
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# MEXICO COAHUILA, NUEVO LEON,
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# MEXICO TAMAULIPAS
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# MEXICO 5 H BEHIND UTC STATES OF DURANGO,
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# MEXICO COAHUILA, NUEVO LEON,
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# MEXICO TAMAULIPAS APR 3 - OCT 29
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# MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF
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# MEXICO CAMPECHE, QUINTANA ROO AND
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# MEXICO YUCATAN
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# From Arthur David Olson (January 21, 1989):
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# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
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# USNO claims there should be four Mexican zones rather than three:
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# a zone that's GMT-8 with DST; a zone that's always GMT-7;
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# a zone that's GMT-6 with DST; and a zone that's always GMT-6.
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# Wait for more authoritative information before changing.
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# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
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Rule Mexico 1987 max - Oct lastSun 2:00 0 S
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Rule Mexico 1987 max - Apr Sun>=1 2:00 1:00 D
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# Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL]
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Zone Mexico/BajaNorte -8:00 Mexico P%sT
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Zone Mexico/BajaSur -7:00 - MST
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Zone Mexico/General -6:00 - CST
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###############################################################################
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# Jamaica
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# From Bob Devine (January 28, 1988):
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# Follows US rules.
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# From U. S. Naval Observatory (January 19, 1989):
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# JAMAICA 5 H BEHIND UTC
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Link US/Eastern Jamaica
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###############################################################################
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# Cuba
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# From Bob Devine (January 28, 1988):
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# . . .DST is from 2nd Sunday in May to 2nd Sunday in October since 1981.
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# Change at midnight. In 1979 & 1980, started at 3rd Sunday in March
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# (I think).
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# From U. S. Naval Observatory (January 19, 1989):
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# CUBA 5 H BEHIND UTC
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# CUBA 4 H BEHIND UTC MAR 20 - OCT 8
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# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
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Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
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Rule Cuba 1979 1980 - Oct Sun>=8 0:00 0 S
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Rule Cuba 1981 max - May Sun>=8 0:00 1:00 D
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Rule Cuba 1981 max - Oct Sun>=8 0:00 0 S
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# Zone NAME GMTOFF RULES/SAVE FORMAT
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Zone Cuba -5:00 Cuba C%sT
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