Import tzdata 2019c
Changes: https://github.com/eggert/tz/blob/2019c/NEWS MFC after: 3 days
This commit is contained in:
Philip Paeps
parent
aaa3852435
commit
798c0c0b01
@ -1,5 +1,80 @@
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News for the tz database
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Release 2019c - 2019-09-11 08:59:48 -0700
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Briefly:
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Fiji observes DST from 2019-11-10 to 2020-01-12.
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Norfolk Island starts observing Australian-style DST.
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Changes to future timestamps
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Fiji's next DST transitions will be 2019-11-10 and 2020-01-12
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instead of 2019-11-03 and 2020-01-19. (Thanks to Raymond Kumar.)
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Adjust future guesses accordingly.
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Norfolk Island will observe Australian-style DST starting in
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spring 2019. The first transition is on 2019-10-06. (Thanks to
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Kyle Czech and Michael Deckers.)
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Changes to past timestamps
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Many corrections to time in Turkey from 1940 through 1985.
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(Thanks to Oya Vulaş via Alois Treindl, and to Kıvanç Yazan.)
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The Norfolk Island 1975-03-02 transition was at 02:00 standard
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time, not 02:00 DST. (Thanks to Michael Deckers.)
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South Korea observed DST from 1948 through 1951. Although this
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info was supposed to appear in release 2014j, a typo inadvertently
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suppressed the change. (Thanks to Alois Treindl.)
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Detroit observed DST in 1967 and 1968 following the US DST rules,
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except that its 1967 DST began on June 14 at 00:01. (Thanks to
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Alois Treindl for pointing out that the old data entries were
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probably wrong.)
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Fix several errors in pre-1970 transitions in Perry County, IN.
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(Thanks to Alois Triendl for pointing out the 1967/9 errors.)
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Edmonton did not observe DST in 1967 or 1969. In 1946 Vancouver
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ended DST on 09-29 not 10-13, and Vienna ended DST on 10-07 not
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10-06. In 1945 Königsberg (now Kaliningrad) switched from +01/+02
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to +02/+03 on 04-10 not 01-01, and its +02/+03 is abbreviated
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EET/EEST, not CET/CEST. (Thanks to Alois Triendl.) In 1946
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Königsberg switched to +03 on 04-07 not 01-01.
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In 1946 Louisville switched from CST to CDT on 04-28 at 00:01, not
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01-01 at 00:00. (Thanks to Alois Treindl and Michael Deckers.)
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Also, it switched from CST to CDT on 1950-04-30, not 1947-04-27.
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The 1892-05-01 transition in Brussels was at 00:17:30, not at noon.
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(Thanks to Michael Deckers.)
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Changes to past time zone abbreviations and DST flags
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Hong Kong Winter Time, observed from 1941-10-01 to 1941-12-25,
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is now flagged as DST and is abbreviated HKWT not HKT.
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Changes to code
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leapseconds.awk now relies only on its input data, rather than
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also relying on its comments. (Inspired by code from Dennis
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Ferguson and Chris Woodbury.)
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The code now defends against CRLFs in leap-seconds.list.
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(Thanks to Brian Inglis and Chris Woodbury.)
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Changes to documentation and commentary
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theory.html discusses leap seconds. (Thanks to Steve Summit.)
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Nashville's newspapers dueled about the time of day in the 1950s.
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(Thanks to John Seigenthaler.)
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Liechtenstein observed Swiss DST in 1941/2.
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(Thanks to Alois Treindl.)
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Release 2019b - 2019-07-01 00:09:53 -0700
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Briefly:
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@ -8,7 +8,7 @@
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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 (2018-06-19):
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# From Paul Eggert (2019-07-11):
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#
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# Unless otherwise specified, the source for data through 1990 is:
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# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
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@ -47,13 +47,13 @@
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# 7:00 WIB west Indonesia (Waktu Indonesia Barat)
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# 8:00 WITA central Indonesia (Waktu Indonesia Tengah)
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# 8:00 CST China
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# 8:00 PST PDT* Philippine Standard Time
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# 8:00 HKT HKST Hong Kong (HKWT* for Winter Time in late 1941)
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# 8:00 PST PDT* Philippines
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# 8:30 KST KDT Korea when at +0830
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# 9:00 WIT east Indonesia (Waktu Indonesia Timur)
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# 9:00 JST JDT Japan
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# 9:00 KST KDT Korea when at +09
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# 9:30 ACST Australian Central Standard Time
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# *I invented the abbreviation PDT; see "Philippines" below.
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# *I invented the abbreviations HKWT and PDT; see below.
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# Otherwise, these tables typically use numeric abbreviations like +03
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# and +0330 for integer hour and minute UT offsets. Although earlier
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# editions invented alphabetic time zone abbreviations for every
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@ -653,6 +653,15 @@ Zone Asia/Urumqi 5:50:20 - LMT 1928
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# * 1941-09-30, Hong Kong Daily Press, Winter Time Warning.
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# https://i.imgur.com/dge4kFJ.png
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# From Paul Eggert (2019-07-11):
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# "Hong Kong winter time" is considered to be daylight saving.
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# "Hong Kong had adopted daylight saving on June 15 as a wartime measure,
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# clocks moving forward one hour until October 1, when they would be put back
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# by just half an hour for 'Hong Kong Winter time', so that daylight saving
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# operated year round." -- Low Z. The longest day: when wartime Hong Kong
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# introduced daylight saving. South China Morning Post. 2019-06-28.
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# https://www.scmp.com/magazines/post-magazine/short-reads/article/3016281/longest-day-when-wartime-hong-kong-introduced
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# From P Chan (2018-12-31):
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# * According to the Hong Kong Daylight-Saving Regulations, 1941, the
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# 1941 spring-forward transition was at 03:00.
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@ -754,7 +763,7 @@ Rule HK 1979 only - Oct 21 3:30 0 -
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Zone Asia/Hong_Kong 7:36:42 - LMT 1904 Oct 30 0:36:42
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8:00 - HKT 1941 Jun 15 3:00
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8:00 1:00 HKST 1941 Oct 1 4:00
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8:30 - HKT 1941 Dec 25
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8:00 0:30 HKWT 1941 Dec 25
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9:00 - JST 1945 Nov 18 2:00
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8:00 HK HK%sT
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@ -2419,7 +2428,7 @@ Rule ROK 1987 1988 - Oct Sun>=8 3:00 0 S
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Zone Asia/Seoul 8:27:52 - LMT 1908 Apr 1
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8:30 - KST 1912 Jan 1
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9:00 - JST 1945 Sep 8
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9:00 - KST 1954 Mar 21
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9:00 ROK K%sT 1954 Mar 21
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8:30 ROK K%sT 1961 Aug 10
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9:00 ROK K%sT
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Zone Asia/Pyongyang 8:23:00 - LMT 1908 Apr 1
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@ -3604,7 +3613,7 @@ Zone Asia/Tashkent 4:37:11 - LMT 1924 May 2
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# and in South Vietnam in particular (after 1954):
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# To 07:00 on 1911-05-01.
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# To 08:00 on 1942-12-31 at 23:00.
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# To 09:00 in 1945-03-14 at 23:00.
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# To 09:00 on 1945-03-14 at 23:00.
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# To 07:00 on 1945-09-02 in Vietnam.
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# To 08:00 on 1947-04-01 in French-controlled Indochina.
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# To 07:00 on 1955-07-01 in South Vietnam.
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@ -367,13 +367,18 @@ Zone Indian/Cocos 6:27:40 - LMT 1900
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# From Raymond Kumar (2018-07-13):
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# http://www.fijitimes.com/government-approves-2018-daylight-saving/
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# ... The daylight saving period will end at 3am on Sunday January 13, 2019.
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#
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# From Paul Eggert (2018-07-15):
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# For now, guess DST from 02:00 the first Sunday in November to 03:00
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# the first Sunday on or after January 13. January transitions reportedly
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# From Paul Eggert (2019-08-06):
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# Today Raymond Kumar reported the Government of Fiji Gazette Supplement No. 27
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# (2019-08-02) said that Fiji observes DST "commencing at 2.00 am on
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# Sunday, 10 November 2019 and ending at 3.00 am on Sunday, 12 January 2020."
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# For now, guess DST from 02:00 the second Sunday in November to 03:00
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# the first Sunday on or after January 12. January transitions reportedly
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# depend on when school terms start. Although the guess is ad hoc, it matches
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# transitions since late 2014 and seems more likely to match future
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# practice than guessing no DST.
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# transitions planned this year and seems more likely to match future practice
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# than guessing no DST.
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# From Michael Deckers (2019-08-06):
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# https://www.laws.gov.fj/LawsAsMade/downloadfile/848
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# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
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Rule Fiji 1998 1999 - Nov Sun>=1 2:00 1:00 -
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@ -384,8 +389,9 @@ Rule Fiji 2010 2013 - Oct Sun>=21 2:00 1:00 -
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Rule Fiji 2011 only - Mar Sun>=1 3:00 0 -
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Rule Fiji 2012 2013 - Jan Sun>=18 3:00 0 -
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Rule Fiji 2014 only - Jan Sun>=18 2:00 0 -
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Rule Fiji 2014 max - Nov Sun>=1 2:00 1:00 -
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Rule Fiji 2015 max - Jan Sun>=13 3:00 0 -
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Rule Fiji 2014 2018 - Nov Sun>=1 2:00 1:00 -
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Rule Fiji 2015 max - Jan Sun>=12 3:00 0 -
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Rule Fiji 2019 max - Nov Sun>=8 2:00 1:00 -
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# Zone NAME STDOFF RULES FORMAT [UNTIL]
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Zone Pacific/Fiji 11:55:44 - LMT 1915 Oct 26 # Suva
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12:00 Fiji +12/+13
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@ -604,10 +610,11 @@ Zone Pacific/Niue -11:19:40 - LMT 1901 # Alofi
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# Zone NAME STDOFF RULES FORMAT [UNTIL]
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Zone Pacific/Norfolk 11:11:52 - LMT 1901 # Kingston
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11:12 - +1112 1951
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11:30 - +1130 1974 Oct 27 02:00
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11:30 1:00 +1230 1975 Mar 2 02:00
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11:30 - +1130 2015 Oct 4 02:00
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11:00 - +11
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11:30 - +1130 1974 Oct 27 02:00s
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11:30 1:00 +1230 1975 Mar 2 02:00s
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11:30 - +1130 2015 Oct 4 02:00s
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11:00 - +11 2019 Jul
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11:00 AN +11/+12
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# Palau (Belau)
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# Zone NAME STDOFF RULES FORMAT [UNTIL]
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@ -1875,12 +1882,21 @@ Zone Pacific/Wallis 12:15:20 - LMT 1901
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# ... at 12.30 am (by legal time in New South Wales) on 4 October 2015.
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# http://www.norfolkisland.gov.nf/nia/MediaRelease/Media%20Release%20Norfolk%20Island%20Standard%20Time%20Change.pdf
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# From Paul Eggert (2015-09-23):
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# From Paul Eggert (2019-08-28):
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# Transitions before 2015 are from timeanddate.com, which consulted
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# the Norfolk Island Museum and the Australian Bureau of Meteorology's
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# Norfolk Island station, and found no record of Norfolk observing DST
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# other than in 1974/5. See:
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# https://www.timeanddate.com/time/australia/norfolk-island.html
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# However, disagree with timeanddate about the 1975-03-02 transition;
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# timeanddate has 02:00 but 02:00s corresponds to what the NSW law said
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# (thanks to Michael Deckers).
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# Norfolk started observing Australian DST in spring 2019.
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# From Kyle Czech (2019-08-13):
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# https://www.legislation.gov.au/Details/F2018L01702
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# From Michael Deckers (2019-08-14):
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# https://www.legislation.gov.au/Details/F2019C00010
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# Palau
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# See commentary for Micronesia.
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@ -507,19 +507,35 @@ Zone Asia/Muscat 3:54:24 - LMT 1920
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#Zone Asia/Panaji [not enough info to complete]
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# Cambodia
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# From Paul Eggert (2014-10-11):
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# See Asia/Ho_Chi_Minh for the source for most of this data. Also, guess
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# (1) Cambodia reverted to UT +07 on 1945-09-02, when Vietnam did, and
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# (2) they also reverted to +07 on 1953-11-09, the date of independence.
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# These guesses are probably wrong but they're better than guessing no
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# transitions there.
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# From an adoptive daughter of the late Cambodian ruler Prince Sihanouk,
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# via Alois Treindl (2019-08-08):
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#
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# King Sihanouk said that, during the Japanese occupation, starting with
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# what historians refer to as "le coup de force du 9 mars 1945", Cambodia,
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# like the entire French Indochina, used Tokyo time zone. After Japan
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# surrendered, 2 September 1945, Cambodia fell under French rule again and
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# adopted Hanoi time zone again.
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#
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# However, on 7 January 1946, Sihanouk and Tioulong managed to obtain a
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# status of "internal autonomy" from the government of Charles de Gaulle.
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# Although many fields remained under the administration of the French
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# (customs, taxes, justice, defence, foreign affairs, etc.), the Cambodian
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# administration was responsible for religious matters and traditional
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# celebrations, which included our calendar and time. The time zone was GMT
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# + 7 and _no_ DST was applied.
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#
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# After Sihanouk and Tioulong achieved full independence, on 9 November 1953,
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# GMT + 7 was maintained.
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# From Paul Eggert (2019-08-26):
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# See Asia/Ho_Chi_Minh for the source for most of rest of this data.
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Zone Asia/Phnom_Penh 6:59:40 - LMT 1906 Jul 1
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7:06:30 - PLMT 1911 May 1
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7:00 - +07 1942 Dec 31 23:00
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8:00 - +08 1945 Mar 14 23:00
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9:00 - +09 1945 Sep 2
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7:00 - +07 1947 Apr 1
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8:00 - +08 1953 Nov 9
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7:00 - +07
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# Israel
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@ -646,7 +662,7 @@ Zone Europe/Tiraspol 1:58:32 - LMT 1880
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# Liechtenstein
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Zone Europe/Vaduz 0:38:04 - LMT 1894 Jun
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1:00 - CET 1981
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1:00 Swiss CE%sT 1981
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1:00 EU CE%sT
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# Croatia
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@ -821,11 +821,16 @@ Zone Europe/Andorra 0:06:04 - LMT 1901
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# Shanks & Pottenger give 02:00, the BEV 00:00. Go with the BEV,
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# and guess 02:00 for 1945-04-12.
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# From Alois Triendl (2019-07-22):
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# In 1946 the end of DST was on Monday, 7 October 1946, at 3:00 am.
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# Shanks had this right. Source: Die Weltpresse, 5. Oktober 1946, page 5.
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# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
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Rule Austria 1920 only - Apr 5 2:00s 1:00 S
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Rule Austria 1920 only - Sep 13 2:00s 0 -
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Rule Austria 1946 only - Apr 14 2:00s 1:00 S
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Rule Austria 1946 1948 - Oct Sun>=1 2:00s 0 -
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Rule Austria 1946 only - Oct 7 2:00s 0 -
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Rule Austria 1947 1948 - Oct Sun>=1 2:00s 0 -
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Rule Austria 1947 only - Apr 6 2:00s 1:00 S
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Rule Austria 1948 only - Apr 18 2:00s 1:00 S
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Rule Austria 1980 only - Apr 6 0:00 1:00 S
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@ -875,15 +880,35 @@ Zone Europe/Minsk 1:50:16 - LMT 1880
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# Belgium
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#
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# From Paul Eggert (1997-07-02):
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# From Michael Deckers (2019-08-25):
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# The exposition in the web page
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# https://www.bestor.be/wiki/index.php/Voyager_dans_le_temps._L%E2%80%99introduction_de_la_norme_de_Greenwich_en_Belgique
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# gives several contemporary sources from which one can conclude that
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# the switch in Europe/Brussels on 1892-05-01 was from 00:17:30 to 00:00:00.
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#
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# From Paul Eggert (2019-08-28):
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# This quote helps explain the late-1914 situation:
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# In early November 1914, the Germans imposed the time zone used in central
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# Europe and forced the inhabitants to set their watches and public clocks
|
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# sixty minutes ahead. Many were reluctant to accept "German time" and
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# continued to use "Belgian time" among themselves. Reflecting the spirit of
|
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# resistance that arose in the population, a song made fun of this change....
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# The song ended:
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# Putting your clock forward
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# Will but hasten the happy hour
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# When we kick out the Boches!
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||||
# See: Pluvinage G. Brussels on German time. Cahiers Bruxellois -
|
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# Brusselse Cahiers. 2014;XLVI(1E):15-38.
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# https://www.cairn.info/revue-cahiers-bruxellois-2014-1E-page-15.htm
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#
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# Entries from 1914 through 1917 are taken from "De tijd in België"
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# <https://www.astro.oma.be/GENERAL/INFO/nli001a.html>.
|
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# Entries from 1918 through 1991 are taken from:
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# Annuaire de L'Observatoire Royal de Belgique,
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# Avenue Circulaire, 3, B-1180 BRUXELLES, CLVIIe année, 1991
|
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# (Imprimerie HAYEZ, s.p.r.l., Rue Fin, 4, 1080 BRUXELLES, MCMXC),
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# pp 8-9.
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# LMT before 1892 was 0:17:30, according to the official journal of Belgium:
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# Moniteur Belge, Samedi 30 Avril 1892, N.121.
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# Thanks to Pascal Delmoitie for these references.
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# Thanks to Pascal Delmoitie for the 1918/1991 references.
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# The 1918 rules are listed for completeness; they apply to unoccupied Belgium.
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# Assume Brussels switched to WET in 1918 when the armistice took effect.
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#
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@ -928,7 +953,7 @@ Rule Belgium 1946 only - May 19 2:00s 1:00 S
|
||||
Rule Belgium 1946 only - Oct 7 2:00s 0 -
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# Zone NAME STDOFF RULES FORMAT [UNTIL]
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Zone Europe/Brussels 0:17:30 - LMT 1880
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0:17:30 - BMT 1892 May 1 12:00 # Brussels MT
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0:17:30 - BMT 1892 May 1 00:17:30
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0:00 - WET 1914 Nov 8
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1:00 - CET 1916 May 1 0:00
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1:00 C-Eur CE%sT 1918 Nov 11 11:00u
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@ -1627,6 +1652,13 @@ Zone Atlantic/Reykjavik -1:28 - LMT 1908
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# advanced to sixty minutes later starting at hour two on 1944-04-02; ...
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# Starting at hour three on the date 1944-09-17 standard time will be resumed.
|
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#
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# From Alois Triendl (2019-07-02):
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# I spent 6 Euros to buy two archive copies of Il Messaggero, a Roman paper,
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# for 1 and 2 April 1944. The edition of 2 April has this note: "Tonight at 2
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# am, put forward the clock by one hour. Remember that in the night between
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# today and Monday the 'ora legale' will come in force again." That makes it
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||||
# clear that in Rome the change was on Monday, 3 April 1944 at 2 am.
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||||
#
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||||
# From Paul Eggert (2016-10-27):
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# Go with INRiM for DST rules, except as corrected by Inglis for 1944
|
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# for the Kingdom of Italy. This is consistent with Renzo Baldini.
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@ -1774,15 +1806,10 @@ Zone Europe/Riga 1:36:34 - LMT 1880
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||||
# From Paul Eggert (2013-09-09):
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# Shanks & Pottenger say Vaduz is like Zurich.
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# From Alois Treindl (2013-09-18):
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# http://www.eliechtensteinensia.li/LIJ/1978/1938-1978/1941.pdf
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# ... confirms on p. 6 that Liechtenstein followed Switzerland in 1941 and 1942.
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||||
# I ... translate only the last two paragraphs:
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# ... during second world war, in the years 1941 and 1942, Liechtenstein
|
||||
# introduced daylight saving time, adapting to Switzerland. From 1943 on
|
||||
# central European time was in force throughout the year.
|
||||
# From a report of the duke's government to the high council,
|
||||
# regarding the introduction of a time law, of 31 May 1977.
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||||
# From Alois Treindl (2019-07-04):
|
||||
# I was able to access the online archive of the Vaduz paper Vaterland ...
|
||||
# I could confirm from the paper that Liechtenstein did in fact follow
|
||||
# the same DST in 1941 and 1942 as Switzerland did.
|
||||
|
||||
Link Europe/Zurich Europe/Vaduz
|
||||
|
||||
@ -2490,6 +2517,12 @@ Zone Europe/Bucharest 1:44:24 - LMT 1891 Oct
|
||||
# Europe/Kaliningrad covers...
|
||||
# 39 RU-KGD Kaliningrad Oblast
|
||||
|
||||
# From Paul Eggert (2019-07-25):
|
||||
# Although Shanks lists 1945-01-01 as the date for transition from
|
||||
# +01/+02 to +02/+03, more likely this is a placeholder. Guess that
|
||||
# the transition occurred at 1945-04-10 00:00, which is about when
|
||||
# Königsberg surrendered to Soviet troops. (Thanks to Alois Triendl.)
|
||||
|
||||
# From Paul Eggert (2016-03-18):
|
||||
# The 1989 transition is from USSR act No. 227 (1989-03-14).
|
||||
|
||||
@ -2506,8 +2539,8 @@ Zone Europe/Bucharest 1:44:24 - LMT 1891 Oct
|
||||
# Moscow on 1991-11-03, switched to Moscow-1 on 1992-01-19.
|
||||
|
||||
Zone Europe/Kaliningrad 1:22:00 - LMT 1893 Apr
|
||||
1:00 C-Eur CE%sT 1945
|
||||
2:00 Poland CE%sT 1946
|
||||
1:00 C-Eur CE%sT 1945 Apr 10
|
||||
2:00 Poland EE%sT 1946 Apr 7
|
||||
3:00 Russia MSK/MSD 1989 Mar 26 2:00s
|
||||
2:00 Russia EE%sT 2011 Mar 27 2:00s
|
||||
3:00 - +03 2014 Oct 26 2:00s
|
||||
@ -3650,20 +3683,75 @@ Zone Europe/Zurich 0:34:08 - LMT 1853 Jul 16 # See above comment.
|
||||
|
||||
# Turkey
|
||||
|
||||
# From Alois Treindl (2019-08-12):
|
||||
# http://www.astrolojidergisi.com/yazsaati.htm has researched the time zone
|
||||
# history of Turkey, based on newspaper archives and official documents.
|
||||
# From Paul Eggert (2019-08-28):
|
||||
# That source (Oya Vulaş, "Türkiye'de Yaz Saati Uygulamaları")
|
||||
# is used for 1940/1972, where it seems more reliable than our other
|
||||
# sources.
|
||||
|
||||
# From Kıvanç Yazan (2019-08-12):
|
||||
# http://www.resmigazete.gov.tr/arsiv/14539.pdf#page=24
|
||||
# 1973-06-03 01:00 -> 02:00, 1973-11-04 02:00 -> 01:00
|
||||
#
|
||||
# http://www.resmigazete.gov.tr/arsiv/14829.pdf#page=1
|
||||
# 1974-03-31 02:00 -> 03:00, 1974-11-03 02:00 -> 01:00
|
||||
#
|
||||
# http://www.resmigazete.gov.tr/arsiv/15161.pdf#page=1
|
||||
# 1975-03-22 02:00 -> 03:00, 1975-11-02 02:00 -> 01:00
|
||||
#
|
||||
# http://www.resmigazete.gov.tr/arsiv/15535_1.pdf#page=1
|
||||
# 1976-03-21 02:00 -> 03:00, 1976-10-31 02:00 -> 01:00
|
||||
#
|
||||
# http://www.resmigazete.gov.tr/arsiv/15778.pdf#page=5
|
||||
# 1977-04-03 02:00 -> 03:00, 1977-10-16 02:00 -> 01:00,
|
||||
# 1978-04-02 02:00 -> 03:00 (not applied, see below)
|
||||
# 1978-10-15 02:00 -> 01:00 (not applied, see below)
|
||||
# 1979-04-01 02:00 -> 03:00 (not applied, see below)
|
||||
# 1979-10-14 02:00 -> 01:00 (not applied, see below)
|
||||
#
|
||||
# http://www.resmigazete.gov.tr/arsiv/16245.pdf#page=17
|
||||
# This cancels the previous decision, and repeats it only for 1978.
|
||||
# 1978-04-02 02:00 -> 03:00, 1978-10-15 02:00 -> 01:00
|
||||
# (not applied due to standard TZ change below)
|
||||
#
|
||||
# http://www.resmigazete.gov.tr/arsiv/16331.pdf#page=3
|
||||
# This decision changes the default longitude for Turkish time zone from 30
|
||||
# degrees East to 45 degrees East. This means a standard TZ change, from +2
|
||||
# to +3. This is published & applied on 1978-06-29. At that time, Turkey was
|
||||
# already on summer time (already on 45E). Hence, this new law just meant an
|
||||
# "continuous summer time". Note that this was reversed in a few years.
|
||||
#
|
||||
# http://www.resmigazete.gov.tr/arsiv/18119_1.pdf#page=1
|
||||
# 1983-07-31 02:00 -> 03:00 (note that this jumps TZ to +4)
|
||||
# 1983-10-02 02:00 -> 01:00 (back to +3)
|
||||
#
|
||||
# http://www.resmigazete.gov.tr/arsiv/18561.pdf (page 1 and 34)
|
||||
# At this time, Turkey is still on +3 with no spring-forward on early
|
||||
# 1984. This decision is published on 10/31/1984. Page 1 declares
|
||||
# the decision of reverting the "default longitude change". So the
|
||||
# standard time should go back to +3 (30E). And page 34 explains when
|
||||
# that will happen: 1984-11-01 02:00 -> 01:00. You can think of this
|
||||
# as "end of continuous summer time, change of standard time zone".
|
||||
#
|
||||
# http://www.resmigazete.gov.tr/arsiv/18713.pdf#page=1
|
||||
# 1985-04-20 01:00 -> 02:00, 1985-09-28 02:00 -> 01:00
|
||||
|
||||
# From Kıvanç Yazan (2016-09-25):
|
||||
# 1) For 1986-2006, DST started at 01:00 local and ended at 02:00 local, with
|
||||
# no exceptions.
|
||||
# 2) 1994's lastSun was overridden with Mar 20 ...
|
||||
# Here are official papers:
|
||||
# http://www.resmigazete.gov.tr/arsiv/19032.pdf - page 2 for 1986
|
||||
# http://www.resmigazete.gov.tr/arsiv/19400.pdf - page 4 for 1987
|
||||
# http://www.resmigazete.gov.tr/arsiv/19752.pdf - page 15 for 1988
|
||||
# http://www.resmigazete.gov.tr/arsiv/20102.pdf - page 6 for 1989
|
||||
# http://www.resmigazete.gov.tr/arsiv/20464.pdf - page 1 for 1990 - 1992
|
||||
# http://www.resmigazete.gov.tr/arsiv/21531.pdf - page 15 for 1993 - 1995
|
||||
# http://www.resmigazete.gov.tr/arsiv/21879.pdf - page 1 for overriding 1994
|
||||
# http://www.resmigazete.gov.tr/arsiv/22588.pdf - page 1 for 1996, 1997
|
||||
# http://www.resmigazete.gov.tr/arsiv/23286.pdf - page 10 for 1998 - 2000
|
||||
# http://www.resmigazete.gov.tr/arsiv/19032.pdf#page=2 for 1986
|
||||
# http://www.resmigazete.gov.tr/arsiv/19400.pdf#page=4 for 1987
|
||||
# http://www.resmigazete.gov.tr/arsiv/19752.pdf#page=15 for 1988
|
||||
# http://www.resmigazete.gov.tr/arsiv/20102.pdf#page=6 for 1989
|
||||
# http://www.resmigazete.gov.tr/arsiv/20464.pdf#page=1 for 1990 - 1992
|
||||
# http://www.resmigazete.gov.tr/arsiv/21531.pdf#page=15 for 1993 - 1995
|
||||
# http://www.resmigazete.gov.tr/arsiv/21879.pdf#page=1 for overriding 1994
|
||||
# http://www.resmigazete.gov.tr/arsiv/22588.pdf#page=1 for 1996, 1997
|
||||
# http://www.resmigazete.gov.tr/arsiv/23286.pdf#page=10 for 1998 - 2000
|
||||
# http://www.resmigazete.gov.tr/eskiler/2001/03/20010324.htm#2 - for 2001
|
||||
# http://www.resmigazete.gov.tr/eskiler/2002/03/20020316.htm#2 - for 2002-2006
|
||||
# From Paul Eggert (2016-09-25):
|
||||
@ -3747,46 +3835,36 @@ Rule Turkey 1922 only - Oct 8 0:00 0 -
|
||||
Rule Turkey 1924 only - May 13 0:00 1:00 S
|
||||
Rule Turkey 1924 1925 - Oct 1 0:00 0 -
|
||||
Rule Turkey 1925 only - May 1 0:00 1:00 S
|
||||
Rule Turkey 1940 only - Jun 30 0:00 1:00 S
|
||||
Rule Turkey 1940 only - Oct 5 0:00 0 -
|
||||
Rule Turkey 1940 only - Jul 1 0:00 1:00 S
|
||||
Rule Turkey 1940 only - Oct 6 0:00 0 -
|
||||
Rule Turkey 1940 only - Dec 1 0:00 1:00 S
|
||||
Rule Turkey 1941 only - Sep 21 0:00 0 -
|
||||
Rule Turkey 1942 only - Apr 1 0:00 1:00 S
|
||||
# Whitman omits the next two transition and gives 1945 Oct 1;
|
||||
# go with Shanks & Pottenger.
|
||||
Rule Turkey 1942 only - Nov 1 0:00 0 -
|
||||
Rule Turkey 1945 only - Apr 2 0:00 1:00 S
|
||||
Rule Turkey 1945 only - Oct 8 0:00 0 -
|
||||
Rule Turkey 1946 only - Jun 1 0:00 1:00 S
|
||||
Rule Turkey 1946 only - Oct 1 0:00 0 -
|
||||
Rule Turkey 1947 1948 - Apr Sun>=16 0:00 1:00 S
|
||||
Rule Turkey 1947 1950 - Oct Sun>=2 0:00 0 -
|
||||
Rule Turkey 1947 1951 - Oct Sun>=2 0:00 0 -
|
||||
Rule Turkey 1949 only - Apr 10 0:00 1:00 S
|
||||
Rule Turkey 1950 only - Apr 19 0:00 1:00 S
|
||||
Rule Turkey 1950 only - Apr 16 0:00 1:00 S
|
||||
Rule Turkey 1951 only - Apr 22 0:00 1:00 S
|
||||
Rule Turkey 1951 only - Oct 8 0:00 0 -
|
||||
# DST for 15 months; unusual but we'll let it pass.
|
||||
Rule Turkey 1962 only - Jul 15 0:00 1:00 S
|
||||
Rule Turkey 1962 only - Oct 8 0:00 0 -
|
||||
Rule Turkey 1963 only - Oct 30 0:00 0 -
|
||||
Rule Turkey 1964 only - May 15 0:00 1:00 S
|
||||
Rule Turkey 1964 only - Oct 1 0:00 0 -
|
||||
Rule Turkey 1970 1972 - May Sun>=2 0:00 1:00 S
|
||||
Rule Turkey 1970 1972 - Oct Sun>=2 0:00 0 -
|
||||
Rule Turkey 1973 only - Jun 3 1:00 1:00 S
|
||||
Rule Turkey 1973 only - Nov 4 3:00 0 -
|
||||
Rule Turkey 1973 1976 - Oct Sun>=31 2:00 0 -
|
||||
Rule Turkey 1974 only - Mar 31 2:00 1:00 S
|
||||
Rule Turkey 1974 only - Nov 3 5:00 0 -
|
||||
Rule Turkey 1975 only - Mar 30 0:00 1:00 S
|
||||
Rule Turkey 1975 1976 - Oct lastSun 0:00 0 -
|
||||
Rule Turkey 1976 only - Jun 1 0:00 1:00 S
|
||||
Rule Turkey 1977 1978 - Apr Sun>=1 0:00 1:00 S
|
||||
Rule Turkey 1977 only - Oct 16 0:00 0 -
|
||||
Rule Turkey 1979 1980 - Apr Sun>=1 3:00 1:00 S
|
||||
Rule Turkey 1979 1982 - Oct Mon>=11 0:00 0 -
|
||||
Rule Turkey 1981 1982 - Mar lastSun 3:00 1:00 S
|
||||
Rule Turkey 1983 only - Jul 31 0:00 1:00 S
|
||||
Rule Turkey 1983 only - Oct 2 0:00 0 -
|
||||
Rule Turkey 1985 only - Apr 20 0:00 1:00 S
|
||||
Rule Turkey 1985 only - Sep 28 0:00 0 -
|
||||
Rule Turkey 1975 only - Mar 22 2:00 1:00 S
|
||||
Rule Turkey 1976 only - Mar 21 2:00 1:00 S
|
||||
Rule Turkey 1977 1978 - Apr Sun>=1 2:00 1:00 S
|
||||
Rule Turkey 1977 1978 - Oct Sun>=15 2:00 0 -
|
||||
Rule Turkey 1978 only - Jun 29 0:00 0 -
|
||||
Rule Turkey 1983 only - Jul 31 2:00 1:00 S
|
||||
Rule Turkey 1983 only - Oct 2 2:00 0 -
|
||||
Rule Turkey 1985 only - Apr 20 1:00s 1:00 S
|
||||
Rule Turkey 1985 only - Sep 28 1:00s 0 -
|
||||
Rule Turkey 1986 1993 - Mar lastSun 1:00s 1:00 S
|
||||
Rule Turkey 1986 1995 - Sep lastSun 1:00s 0 -
|
||||
Rule Turkey 1994 only - Mar 20 1:00s 1:00 S
|
||||
@ -3795,8 +3873,8 @@ Rule Turkey 1996 2006 - Oct lastSun 1:00s 0 -
|
||||
# Zone NAME STDOFF RULES FORMAT [UNTIL]
|
||||
Zone Europe/Istanbul 1:55:52 - LMT 1880
|
||||
1:56:56 - IMT 1910 Oct # Istanbul Mean Time?
|
||||
2:00 Turkey EE%sT 1978 Oct 15
|
||||
3:00 Turkey +03/+04 1985 Apr 20
|
||||
2:00 Turkey EE%sT 1978 Jun 29
|
||||
3:00 Turkey +03/+04 1984 Nov 1 2:00
|
||||
2:00 Turkey EE%sT 2007
|
||||
2:00 EU EE%sT 2011 Mar 27 1:00u
|
||||
2:00 - EET 2011 Mar 28 1:00u
|
||||
|
||||
@ -204,10 +204,10 @@
|
||||
# current -- the update time stamp, the data and the name of the file
|
||||
# will not change.
|
||||
#
|
||||
# Updated through IERS Bulletin C57
|
||||
# File expires on: 28 December 2019
|
||||
# Updated through IERS Bulletin C58
|
||||
# File expires on: 28 June 2020
|
||||
#
|
||||
#@ 3786480000
|
||||
#@ 3802291200
|
||||
#
|
||||
2272060800 10 # 1 Jan 1972
|
||||
2287785600 11 # 1 Jul 1972
|
||||
@ -252,4 +252,4 @@
|
||||
# the hash line is also ignored in the
|
||||
# computation.
|
||||
#
|
||||
#h 83c68138 d3650221 07dbbbcd 11fcc859 ced1106a
|
||||
#h f28827d2 f263b6c3 ec0f19eb a3e0dbf0 97f3fa30
|
||||
|
||||
@ -3,36 +3,39 @@
|
||||
# This file is in the public domain.
|
||||
|
||||
# This file is generated automatically from the data in the public-domain
|
||||
# leap-seconds.list file, which can be copied from
|
||||
# NIST format leap-seconds.list file, which can be copied from
|
||||
# <ftp://ftp.nist.gov/pub/time/leap-seconds.list>
|
||||
# or <ftp://ftp.boulder.nist.gov/pub/time/leap-seconds.list>
|
||||
# or <ftp://tycho.usno.navy.mil/pub/ntp/leap-seconds.list>.
|
||||
# or <ftp://ftp.boulder.nist.gov/pub/time/leap-seconds.list>.
|
||||
# For more about leap-seconds.list, please see
|
||||
# The NTP Timescale and Leap Seconds
|
||||
# <https://www.eecis.udel.edu/~mills/leap.html>.
|
||||
|
||||
# The International Earth Rotation and Reference Systems Service
|
||||
# The rules for leap seconds are specified in Annex 1 (Time scales) of:
|
||||
# Standard-frequency and time-signal emissions.
|
||||
# International Telecommunication Union - Radiocommunication Sector
|
||||
# (ITU-R) Recommendation TF.460-6 (02/2002)
|
||||
# <https://www.itu.int/rec/R-REC-TF.460-6-200202-I/>.
|
||||
# The International Earth Rotation and Reference Systems Service (IERS)
|
||||
# periodically uses leap seconds to keep UTC to within 0.9 s of UT1
|
||||
# (which measures the true angular orientation of the earth in space)
|
||||
# (a proxy for Earth's angle in space as measured by astronomers)
|
||||
# and publishes leap second data in a copyrighted file
|
||||
# <https://hpiers.obspm.fr/iers/bul/bulc/Leap_Second.dat>.
|
||||
# See: Levine J. Coordinated Universal Time and the leap second.
|
||||
# URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995
|
||||
# <https://ieeexplore.ieee.org/document/7909995>.
|
||||
|
||||
# There were no leap seconds before 1972, because the official mechanism
|
||||
# accounting for the discrepancy between atomic time and the earth's rotation
|
||||
# did not exist. The first ("1 Jan 1972") data line in leap-seconds.list
|
||||
# There were no leap seconds before 1972, as no official mechanism
|
||||
# accounted for the discrepancy between atomic time (TAI) and the earth's
|
||||
# rotation. The first ("1 Jan 1972") data line in leap-seconds.list
|
||||
# does not denote a leap second; it denotes the start of the current definition
|
||||
# of UTC.
|
||||
|
||||
# The correction (+ or -) is made at the given time, so lines
|
||||
# will typically look like:
|
||||
# Leap YEAR MON DAY 23:59:60 + R/S
|
||||
# or
|
||||
# Leap YEAR MON DAY 23:59:59 - R/S
|
||||
|
||||
# If the leap second is Rolling (R) the given time is local time (unused here).
|
||||
# All leap-seconds are Stationary (S) at the given UTC time.
|
||||
# The correction (+ or -) is made at the given time, so in the unlikely
|
||||
# event of a negative leap second, a line would look like this:
|
||||
# Leap YEAR MON DAY 23:59:59 - S
|
||||
# Typical lines look like this:
|
||||
# Leap YEAR MON DAY 23:59:60 + S
|
||||
Leap 1972 Jun 30 23:59:60 + S
|
||||
Leap 1972 Dec 31 23:59:60 + S
|
||||
Leap 1973 Dec 31 23:59:60 + S
|
||||
@ -62,8 +65,8 @@ Leap 2015 Jun 30 23:59:60 + S
|
||||
Leap 2016 Dec 31 23:59:60 + S
|
||||
|
||||
# POSIX timestamps for the data in this file:
|
||||
#updated 1467936000
|
||||
#expires 1577491200
|
||||
#updated 1467936000 (2016-07-08 00:00:00 UTC)
|
||||
#expires 1593302400 (2020-06-28 00:00:00 UTC)
|
||||
|
||||
# Updated through IERS Bulletin C57
|
||||
# File expires on: 28 December 2019
|
||||
# Updated through IERS Bulletin C58
|
||||
# File expires on: 28 June 2020
|
||||
|
||||
@ -1,43 +1,59 @@
|
||||
# Generate the 'leapseconds' file from 'leap-seconds.list'.
|
||||
# Generate zic format 'leapseconds' from NIST format 'leap-seconds.list'.
|
||||
|
||||
# This file is in the public domain.
|
||||
|
||||
# This program uses awk arithmetic. POSIX requires awk to support
|
||||
# exact integer arithmetic only through 10**10, which means for NTP
|
||||
# timestamps this program works only to the year 2216, which is the
|
||||
# year 1900 plus 10**10 seconds. However, in practice
|
||||
# POSIX-conforming awk implementations invariably use IEEE-754 double
|
||||
# and so support exact integers through 2**53. By the year 2216,
|
||||
# POSIX will almost surely require at least 2**53 for awk, so for NTP
|
||||
# timestamps this program should be good until the year 285,428,681
|
||||
# (the year 1900 plus 2**53 seconds). By then leap seconds will be
|
||||
# long obsolete, as the Earth will likely slow down so much that
|
||||
# there will be more than 25 hours per day and so some other scheme
|
||||
# will be needed.
|
||||
|
||||
BEGIN {
|
||||
print "# Allowance for leap seconds added to each time zone file."
|
||||
print ""
|
||||
print "# This file is in the public domain."
|
||||
print ""
|
||||
print "# This file is generated automatically from the data in the public-domain"
|
||||
print "# leap-seconds.list file, which can be copied from"
|
||||
print "# NIST format leap-seconds.list file, which can be copied from"
|
||||
print "# <ftp://ftp.nist.gov/pub/time/leap-seconds.list>"
|
||||
print "# or <ftp://ftp.boulder.nist.gov/pub/time/leap-seconds.list>"
|
||||
print "# or <ftp://tycho.usno.navy.mil/pub/ntp/leap-seconds.list>."
|
||||
print "# or <ftp://ftp.boulder.nist.gov/pub/time/leap-seconds.list>."
|
||||
print "# For more about leap-seconds.list, please see"
|
||||
print "# The NTP Timescale and Leap Seconds"
|
||||
print "# <https://www.eecis.udel.edu/~mills/leap.html>."
|
||||
print ""
|
||||
print "# The International Earth Rotation and Reference Systems Service"
|
||||
print "# The rules for leap seconds are specified in Annex 1 (Time scales) of:"
|
||||
print "# Standard-frequency and time-signal emissions."
|
||||
print "# International Telecommunication Union - Radiocommunication Sector"
|
||||
print "# (ITU-R) Recommendation TF.460-6 (02/2002)"
|
||||
print "# <https://www.itu.int/rec/R-REC-TF.460-6-200202-I/>."
|
||||
print "# The International Earth Rotation and Reference Systems Service (IERS)"
|
||||
print "# periodically uses leap seconds to keep UTC to within 0.9 s of UT1"
|
||||
print "# (which measures the true angular orientation of the earth in space)"
|
||||
print "# (a proxy for Earth's angle in space as measured by astronomers)"
|
||||
print "# and publishes leap second data in a copyrighted file"
|
||||
print "# <https://hpiers.obspm.fr/iers/bul/bulc/Leap_Second.dat>."
|
||||
print "# See: Levine J. Coordinated Universal Time and the leap second."
|
||||
print "# URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995"
|
||||
print "# <https://ieeexplore.ieee.org/document/7909995>."
|
||||
print ""
|
||||
print "# There were no leap seconds before 1972, because the official mechanism"
|
||||
print "# accounting for the discrepancy between atomic time and the earth's rotation"
|
||||
print "# did not exist. The first (\"1 Jan 1972\") data line in leap-seconds.list"
|
||||
print "# There were no leap seconds before 1972, as no official mechanism"
|
||||
print "# accounted for the discrepancy between atomic time (TAI) and the earth's"
|
||||
print "# rotation. The first (\"1 Jan 1972\") data line in leap-seconds.list"
|
||||
print "# does not denote a leap second; it denotes the start of the current definition"
|
||||
print"# of UTC."
|
||||
print "# of UTC."
|
||||
print ""
|
||||
print "# The correction (+ or -) is made at the given time, so lines"
|
||||
print "# will typically look like:"
|
||||
print "# Leap YEAR MON DAY 23:59:60 + R/S"
|
||||
print "# or"
|
||||
print "# Leap YEAR MON DAY 23:59:59 - R/S"
|
||||
print ""
|
||||
print "# If the leap second is Rolling (R) the given time is local time (unused here)."
|
||||
print "# All leap-seconds are Stationary (S) at the given UTC time."
|
||||
print "# The correction (+ or -) is made at the given time, so in the unlikely"
|
||||
print "# event of a negative leap second, a line would look like this:"
|
||||
print "# Leap YEAR MON DAY 23:59:59 - S"
|
||||
print "# Typical lines look like this:"
|
||||
print "# Leap YEAR MON DAY 23:59:60 + S"
|
||||
|
||||
monthabbr[ 1] = "Jan"
|
||||
monthabbr[ 2] = "Feb"
|
||||
@ -51,45 +67,34 @@ BEGIN {
|
||||
monthabbr[10] = "Oct"
|
||||
monthabbr[11] = "Nov"
|
||||
monthabbr[12] = "Dec"
|
||||
for (i in monthabbr) {
|
||||
monthnum[monthabbr[i]] = i
|
||||
monthlen[i] = 31
|
||||
}
|
||||
monthlen[2] = 28
|
||||
monthlen[4] = monthlen[6] = monthlen[9] = monthlen[11] = 30
|
||||
|
||||
# Strip trailing CR, in case the input has CRLF form a la NIST.
|
||||
RS = "\r?\n"
|
||||
|
||||
sstamp_init()
|
||||
}
|
||||
|
||||
/^#\tUpdated through/ || /^#\tFile expires on:/ {
|
||||
/^#[ \t]*[Uu]pdated through/ || /^#[ \t]*[Ff]ile expires on/ {
|
||||
last_lines = last_lines $0 "\n"
|
||||
}
|
||||
|
||||
/^#[$][ \t]/ { updated = $2 }
|
||||
/^#[@][ \t]/ { expires = $2 }
|
||||
|
||||
/^#/ { next }
|
||||
/^[ \t]*#/ { next }
|
||||
|
||||
{
|
||||
NTP_timestamp = $1
|
||||
TAI_minus_UTC = $2
|
||||
hash_mark = $3
|
||||
one = $4
|
||||
month = $5
|
||||
year = $6
|
||||
if (old_TAI_minus_UTC) {
|
||||
if (old_TAI_minus_UTC < TAI_minus_UTC) {
|
||||
sign = "23:59:60\t+"
|
||||
} else {
|
||||
sign = "23:59:59\t-"
|
||||
}
|
||||
m = monthnum[month] - 1
|
||||
if (m == 0) {
|
||||
year--;
|
||||
m = 12
|
||||
}
|
||||
month = monthabbr[m]
|
||||
day = monthlen[m]
|
||||
day += m == 2 && year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)
|
||||
printf "Leap\t%s\t%s\t%s\t%s\tS\n", year, month, day, sign
|
||||
sstamp_to_ymdhMs(NTP_timestamp - 1, ss_NTP)
|
||||
printf "Leap\t%d\t%s\t%d\t%s\tS\n", \
|
||||
ss_year, monthabbr[ss_month], ss_mday, sign
|
||||
}
|
||||
old_TAI_minus_UTC = TAI_minus_UTC
|
||||
}
|
||||
@ -102,7 +107,117 @@ END {
|
||||
|
||||
print ""
|
||||
print "# POSIX timestamps for the data in this file:"
|
||||
printf "#updated %s\n", updated - epoch_minus_NTP
|
||||
printf "#expires %s\n", expires - epoch_minus_NTP
|
||||
sstamp_to_ymdhMs(updated, ss_NTP)
|
||||
printf "#updated %d (%.4d-%.2d-%.2d %.2d:%.2d:%.2d UTC)\n", \
|
||||
updated - epoch_minus_NTP, \
|
||||
ss_year, ss_month, ss_mday, ss_hour, ss_min, ss_sec
|
||||
sstamp_to_ymdhMs(expires, ss_NTP)
|
||||
printf "#expires %d (%.4d-%.2d-%.2d %.2d:%.2d:%.2d UTC)\n", \
|
||||
expires - epoch_minus_NTP, \
|
||||
ss_year, ss_month, ss_mday, ss_hour, ss_min, ss_sec
|
||||
|
||||
printf "\n%s", last_lines
|
||||
}
|
||||
|
||||
# sstamp_to_ymdhMs - convert seconds timestamp to date and time
|
||||
#
|
||||
# Call as:
|
||||
#
|
||||
# sstamp_to_ymdhMs(sstamp, epoch_days)
|
||||
#
|
||||
# where:
|
||||
#
|
||||
# sstamp - is the seconds timestamp.
|
||||
# epoch_days - is the timestamp epoch in Gregorian days since 1600-03-01.
|
||||
# ss_NTP is appropriate for an NTP sstamp.
|
||||
#
|
||||
# Both arguments should be nonnegative integers.
|
||||
# On return, the following variables are set based on sstamp:
|
||||
#
|
||||
# ss_year - Gregorian calendar year
|
||||
# ss_month - month of the year (1-January to 12-December)
|
||||
# ss_mday - day of the month (1-31)
|
||||
# ss_hour - hour (0-23)
|
||||
# ss_min - minute (0-59)
|
||||
# ss_sec - second (0-59)
|
||||
# ss_wday - day of week (0-Sunday to 6-Saturday)
|
||||
#
|
||||
# The function sstamp_init should be called prior to using sstamp_to_ymdhMs.
|
||||
|
||||
function sstamp_init()
|
||||
{
|
||||
# Days in month N, where March is month 0 and January month 10.
|
||||
ss_mon_days[ 0] = 31
|
||||
ss_mon_days[ 1] = 30
|
||||
ss_mon_days[ 2] = 31
|
||||
ss_mon_days[ 3] = 30
|
||||
ss_mon_days[ 4] = 31
|
||||
ss_mon_days[ 5] = 31
|
||||
ss_mon_days[ 6] = 30
|
||||
ss_mon_days[ 7] = 31
|
||||
ss_mon_days[ 8] = 30
|
||||
ss_mon_days[ 9] = 31
|
||||
ss_mon_days[10] = 31
|
||||
|
||||
# Counts of days in a Gregorian year, quad-year, century, and quad-century.
|
||||
ss_year_days = 365
|
||||
ss_quadyear_days = ss_year_days * 4 + 1
|
||||
ss_century_days = ss_quadyear_days * 25 - 1
|
||||
ss_quadcentury_days = ss_century_days * 4 + 1
|
||||
|
||||
# Standard day epochs, suitable for epoch_days.
|
||||
# ss_MJD = 94493
|
||||
# ss_POSIX = 135080
|
||||
ss_NTP = 109513
|
||||
}
|
||||
|
||||
function sstamp_to_ymdhMs(sstamp, epoch_days, \
|
||||
quadcentury, century, quadyear, year, month, day)
|
||||
{
|
||||
ss_hour = int(sstamp / 3600) % 24
|
||||
ss_min = int(sstamp / 60) % 60
|
||||
ss_sec = sstamp % 60
|
||||
|
||||
# Start with a count of days since 1600-03-01 Gregorian.
|
||||
day = epoch_days + int(sstamp / (24 * 60 * 60))
|
||||
|
||||
# Compute a year-month-day date with days of the month numbered
|
||||
# 0-30, months (March-February) numbered 0-11, and years that start
|
||||
# start March 1 and end after the last day of February. A quad-year
|
||||
# starts on March 1 of a year evenly divisible by 4 and ends after
|
||||
# the last day of February 4 years later. A century starts on and
|
||||
# ends before March 1 in years evenly divisible by 100.
|
||||
# A quad-century starts on and ends before March 1 in years divisible
|
||||
# by 400. While the number of days in a quad-century is a constant,
|
||||
# the number of days in each other time period can vary by 1.
|
||||
# Any variation is in the last day of the time period (there might
|
||||
# or might not be a February 29) where it is easy to deal with.
|
||||
|
||||
quadcentury = int(day / ss_quadcentury_days)
|
||||
day -= quadcentury * ss_quadcentury_days
|
||||
ss_wday = (day + 3) % 7
|
||||
century = int(day / ss_century_days)
|
||||
century -= century == 4
|
||||
day -= century * ss_century_days
|
||||
quadyear = int(day / ss_quadyear_days)
|
||||
day -= quadyear * ss_quadyear_days
|
||||
year = int(day / ss_year_days)
|
||||
year -= year == 4
|
||||
day -= year * ss_year_days
|
||||
for (month = 0; month < 11; month++) {
|
||||
if (day < ss_mon_days[month])
|
||||
break
|
||||
day -= ss_mon_days[month]
|
||||
}
|
||||
|
||||
# Convert the date to a conventional day of month (1-31),
|
||||
# month (1-12, January-December) and Gregorian year.
|
||||
ss_mday = day + 1
|
||||
if (month <= 9) {
|
||||
ss_month = month + 3
|
||||
} else {
|
||||
ss_month = month - 9
|
||||
year++
|
||||
}
|
||||
ss_year = 1600 + quadcentury * 400 + century * 100 + quadyear * 4 + year
|
||||
}
|
||||
|
||||
@ -406,6 +406,31 @@ Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58
|
||||
# From Paul Eggert (2015-12-25):
|
||||
# Assume this practice predates 1970, so Fort Pierre can use America/Chicago.
|
||||
|
||||
# From Paul Eggert (2015-04-06):
|
||||
# In 1950s Nashville a public clock had dueling faces, one for conservatives
|
||||
# and the other for liberals; the two sides didn't agree about the time of day.
|
||||
# I haven't found a photo of this clock, nor have I tracked down the TIME
|
||||
# magazine report cited below, but here's the story as told by the late
|
||||
# American journalist John Seigenthaler, who was there:
|
||||
#
|
||||
# "The two [newspaper] owners held strongly contrasting political and
|
||||
# ideological views. Evans was a New South liberal, Stahlman an Old South
|
||||
# conservative, and their two papers frequently clashed editorially, often on
|
||||
# the same day.... In the 1950s as the state legislature was grappling with
|
||||
# the question of whether to approve daylight saving time for the entire state,
|
||||
# TIME magazine reported:
|
||||
#
|
||||
# "'The Nashville Banner and The Nashville Tennessean rarely agree on anything
|
||||
# but the time of day - and last week they couldn't agree on that.'
|
||||
#
|
||||
# "It was all too true. The clock on the front of the building had two faces -
|
||||
# The Tennessean side of the building facing west, the other, east. When it
|
||||
# was high noon Banner time, it was 11 a.m. Tennessean time."
|
||||
#
|
||||
# Seigenthaler J. For 100 years, Tennessean had it covered.
|
||||
# The Tennessean 2007-05-11, republished 2015-04-06.
|
||||
# https://www.tennessean.com/story/insider/extras/2015/04/06/archives-seigenthaler-for-100-years-the-tennessean-had-it-covered/25348545/
|
||||
|
||||
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
|
||||
Rule Chicago 1920 only - Jun 13 2:00 1:00 D
|
||||
Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
|
||||
@ -945,21 +970,21 @@ Zone America/Indiana/Vincennes -5:50:07 - LMT 1883 Nov 18 12:09:53
|
||||
-5:00 US E%sT
|
||||
#
|
||||
# Perry County, Indiana, switched from eastern to central time in April 2006.
|
||||
# From Alois Triendl (2019-07-09):
|
||||
# The Indianapolis News, Friday 27 October 1967 states that Perry County
|
||||
# returned to CST. It went again to EST on 27 April 1969, as documented by the
|
||||
# Indianapolis star of Saturday 26 April.
|
||||
# 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 1955 1960 - Sep lastSun 2:00 0 S
|
||||
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
|
||||
Rule Perry 1961 1963 - Oct lastSun 2:00 0 S
|
||||
# Zone NAME STDOFF 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 - EST 1967 Oct 29 2:00
|
||||
-6:00 US C%sT 1969 Apr 27 2:00
|
||||
-5:00 US E%sT 1971
|
||||
-5:00 - EST 2006 Apr 2 2:00
|
||||
-6:00 US C%sT
|
||||
@ -1035,16 +1060,27 @@ Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44
|
||||
# clear how this matched civil time in Louisville, so for now continue
|
||||
# to assume Louisville switched at noon new local time, like New York.
|
||||
#
|
||||
# From Michael Deckers (2019-08-06):
|
||||
# From the contemporary source given by Alois Treindl,
|
||||
# the switch in Louisville on 1946-04-28 was on 00:01
|
||||
# From Paul Eggert (2019-08-26):
|
||||
# That source was the Louisville Courier-Journal, 1946-04-27, p 4.
|
||||
# Shanks gives 02:00 for all 20th-century transition times in Louisville.
|
||||
# Evidently this is wrong for spring 1946. Although also likely wrong
|
||||
# for other dates, we have no data.
|
||||
#
|
||||
# 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 - Apr lastSun 2:00 1:00 D
|
||||
Rule Louisville 1941 only - Sep lastSun 2:00 0 S
|
||||
Rule Louisville 1946 only - Apr lastSun 0:01 1:00 D
|
||||
Rule Louisville 1946 only - Jun 2 2:00 0 S
|
||||
Rule Louisville 1950 1961 - Apr lastSun 2:00 1:00 D
|
||||
Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
|
||||
Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
|
||||
Rule Louisville 1956 1961 - Oct lastSun 2:00 0 S
|
||||
# Zone NAME STDOFF RULES FORMAT [UNTIL]
|
||||
Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58
|
||||
-6:00 US C%sT 1921
|
||||
@ -1134,18 +1170,19 @@ Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36
|
||||
# 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/
|
||||
# From Paul Eggert (2019-07-06):
|
||||
# Due to a complicated set of legal maneuvers, in 1967 Michigan did
|
||||
# not start daylight saving time when the rest of the US did.
|
||||
# Instead, it began DST on Jun 14 at 00:01. This was big news:
|
||||
# the Detroit Free Press reported it at the top of Page 1 on
|
||||
# 1967-06-14, in an article "State Adjusting to Switch to Fast Time"
|
||||
# by Gary Blonston, above an article about Thurgood Marshall's
|
||||
# confirmation to the US Supreme Court. Although Shanks says Detroit
|
||||
# observed DST until 1967-10-29 00:01, that time of day seems to be
|
||||
# incorrect, as the Free Press later said DST ended in Michigan at the
|
||||
# same time as the rest of the US. Also, although Shanks reports no DST in
|
||||
# Detroit in 1968, it did observe DST that year; in the November 1968
|
||||
# election Michigan voters narrowly repealed DST, effective 1969.
|
||||
#
|
||||
# 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
|
||||
@ -1156,7 +1193,9 @@ 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 Detroit E%sT 1967 Jun 14 0:01
|
||||
-5:00 US E%sT 1969
|
||||
-5:00 - EST 1973
|
||||
-5:00 US E%sT 1975
|
||||
-5:00 - EST 1975 Apr 27 2:00
|
||||
-5:00 US E%sT
|
||||
@ -1205,6 +1244,12 @@ Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
|
||||
#
|
||||
# Other sources occasionally used include:
|
||||
#
|
||||
# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
|
||||
# <https://www.jstor.org/stable/1774359>.
|
||||
#
|
||||
# Pearce C. The Great Daylight Saving Time Controversy.
|
||||
# Australian Ebook Publisher. 2017. ISBN 978-1-925516-96-8.
|
||||
#
|
||||
# Edward W. Whitman, World Time Differences,
|
||||
# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
|
||||
# which I found in the UCLA library.
|
||||
@ -1213,9 +1258,6 @@ Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
|
||||
# <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
|
||||
@ -1857,9 +1899,8 @@ Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
|
||||
# Willett (1914-03) notes that DST "has been in operation ... in the
|
||||
# City of Moose Jaw, Saskatchewan, for one year."
|
||||
|
||||
# From Paul Eggert (2019-04-26):
|
||||
# Chris Pearce's book "The Great Daylight Saving Time Controversy" (2017)
|
||||
# says that Regina observed DST in 1914-1917. No dates and times,
|
||||
# From Paul Eggert (2019-07-25):
|
||||
# Pearce's book says Regina observed DST in 1914-1917. No dates and times,
|
||||
# unfortunately. It also says that in 1914 Saskatoon observed DST
|
||||
# from 1 June to 6 July, and that DST was also tried out in Davidson,
|
||||
# Melfort, and Prince Albert.
|
||||
@ -1939,6 +1980,19 @@ Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
|
||||
|
||||
# Alberta
|
||||
|
||||
# From Alois Triendl (2019-07-19):
|
||||
# There was no DST in Alberta in 1967... Calgary Herald, 29 April 1967.
|
||||
# 1969, no DST, from Edmonton Journal 18 April 1969
|
||||
#
|
||||
# From Paul Eggert (2019-07-25):
|
||||
# Pearce's book says that Alberta's 1948 Daylight Saving Act required
|
||||
# Mountain Standard Time without DST, and that "anyone who broke that law
|
||||
# could be fined up to $25 and costs". There seems to be no record of
|
||||
# anybody paying the fine. The law was not changed until an August 1971
|
||||
# plebiscite reinstituted DST in 1972. This story is also mentioned in:
|
||||
# Boyer JP. Forcing Choice: The Risky Reward of Referendums. Dundum. 2017.
|
||||
# ISBN 978-1459739123.
|
||||
|
||||
# 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
|
||||
@ -1951,10 +2005,6 @@ 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 STDOFF RULES FORMAT [UNTIL]
|
||||
@ -2037,8 +2087,20 @@ Zone America/Edmonton -7:33:52 - LMT 1906 Sep
|
||||
# been on MST (-0700) like Dawson Creek since it advanced its clocks on
|
||||
# 2015-03-08.
|
||||
#
|
||||
# From Paul Eggert (2015-09-23):
|
||||
# From Paul Eggert (2019-07-25):
|
||||
# Shanks says Fort Nelson did not observe DST in 1946, unlike Vancouver.
|
||||
# Alois Triendl confirmed this on 07-22, citing the 1946-04-27 Vancouver Daily
|
||||
# Province. He also cited the 1946-09-28 Victoria Daily Times, which said
|
||||
# that Vancouver, Victoria, etc. "change at midnight Saturday"; for now,
|
||||
# guess they meant 02:00 Sunday since 02:00 was common practice in Vancouver.
|
||||
#
|
||||
# Early Vancouver, Volume Four, by Major J.S. Matthews, V.D., 2011 edition
|
||||
# says that a 1922 plebiscite adopted DST, but a 1923 plebiscite rejected it.
|
||||
# http://former.vancouver.ca/ctyclerk/archives/digitized/EarlyVan/SearchEarlyVan/Vol4pdf/MatthewsEarlyVancouverVol4_DaylightSavings.pdf
|
||||
# A catalog entry for a newspaper clipping seems to indicate that Vancouver
|
||||
# observed DST in 1941 from 07-07 through 09-27; see
|
||||
# https://searcharchives.vancouver.ca/daylight-saving-1918-starts-again-july-7-1941-start-d-s-sept-27-end-of-d-s-1941
|
||||
# We have no further details, so omit them for now.
|
||||
|
||||
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
|
||||
Rule Vanc 1918 only - Apr 14 2:00 1:00 D
|
||||
@ -2047,7 +2109,7 @@ 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 1946 only - Sep 29 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 STDOFF RULES FORMAT [UNTIL]
|
||||
|
||||
@ -1230,14 +1230,8 @@ Zone America/Rio_Branco -4:31:12 - LMT 1914
|
||||
# From Juan Correa (2016-12-04):
|
||||
# Magallanes region ... will keep DST (UTC -3) all year round....
|
||||
# http://www.soychile.cl/Santiago/Sociedad/2016/12/04/433428/Bachelet-firmo-el-decreto-para-establecer-un-horario-unico-para-la-Region-de-Magallanes.aspx
|
||||
#
|
||||
# From Deborah Goldsmith (2017-01-19):
|
||||
# http://www.diariooficial.interior.gob.cl/publicaciones/2017/01/17/41660/01/1169626.pdf
|
||||
# From Paul Eggert (2017-01-19):
|
||||
# The above says the Magallanes change expires 2019-05-11 at 24:00,
|
||||
# so in theory, they will revert to -04/-03 after that, which means
|
||||
# they will switch from -03 to -04 one hour after Santiago does that day.
|
||||
# For now, assume that they will not revert.
|
||||
|
||||
# From Juan Correa (2018-08-13):
|
||||
# As of moments ago, the Ministry of Energy in Chile has announced the new
|
||||
@ -1258,6 +1252,11 @@ Zone America/Rio_Branco -4:31:12 - LMT 1914
|
||||
# So we extend the new rules on Saturdays at 24:00 mainland time indefinitely.
|
||||
# From Juan Correa (2019-02-04):
|
||||
# http://www.diariooficial.interior.gob.cl/publicaciones/2018/11/23/42212/01/1498738.pdf
|
||||
# From Paul Eggert (2019-09-01):
|
||||
# The above says the Magallanes exception expires 2022-04-02 at 24:00,
|
||||
# so in theory, they will revert to -04/-03 after that.
|
||||
# For now, assume that they will not revert,
|
||||
# since they have extended the expiration date once already.
|
||||
|
||||
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
|
||||
Rule Chile 1927 1931 - Sep 1 0:00 1:00 -
|
||||
|
||||
@ -21,6 +21,7 @@
|
||||
database</a></li>
|
||||
<li><a href="#functions">Time and date functions</a></li>
|
||||
<li><a href="#stability">Interface stability</a></li>
|
||||
<li><a href="#leapsec">Leap seconds</a></li>
|
||||
<li><a href="#calendar">Calendrical issues</a></li>
|
||||
<li><a href="#planets">Time and time zones on other planets</a></li>
|
||||
</ul>
|
||||
@ -98,8 +99,9 @@ A <code><abbr>tz</abbr></code> timezone corresponds to a ruleset that can
|
||||
have more than two changes per year, these changes need not merely
|
||||
flip back and forth between two alternatives, and the rules themselves
|
||||
can change at times.
|
||||
Whether and when a timezone changes its
|
||||
clock, and even the timezone's notional base offset from UTC, are variable.
|
||||
Whether and when a timezone changes its clock,
|
||||
and even the timezone's notional base offset from <abbr>UTC</abbr>,
|
||||
are variable.
|
||||
It does not always make sense to talk about a timezone's
|
||||
"base offset", which is not necessarily a single number.
|
||||
</p>
|
||||
@ -428,7 +430,7 @@ in decreasing order of importance:
|
||||
EET/EEST Eastern European,
|
||||
GST/GDT Guam,
|
||||
HST/HDT/HWT/HPT Hawaii,
|
||||
HKT/HKST Hong Kong,
|
||||
HKT/HKST/HKWT Hong Kong,
|
||||
IST India,
|
||||
IST/GMT Irish,
|
||||
IST/IDT/IDDT Israel,
|
||||
@ -972,7 +974,8 @@ an older <code>zic</code>.
|
||||
that do not fit into the POSIX model.
|
||||
</li>
|
||||
<li>
|
||||
POSIX requires that systems ignore leap seconds.
|
||||
POSIX requires that <code>time_t</code> clock counts exclude leap
|
||||
seconds.
|
||||
</li>
|
||||
<li>
|
||||
The <code><abbr>tz</abbr></code> code attempts to support all the
|
||||
@ -1072,7 +1075,8 @@ an older <code>zic</code>.
|
||||
where <code>time_t</code> is signed.
|
||||
</li>
|
||||
<li>
|
||||
These functions can account for leap seconds, thanks to Bradley White.
|
||||
These functions can account for leap seconds;
|
||||
see <a href="#leapsec">Leap seconds</a> below.
|
||||
</li>
|
||||
</ul>
|
||||
|
||||
@ -1248,6 +1252,69 @@ between now and the future time.
|
||||
</p>
|
||||
</section>
|
||||
|
||||
<section>
|
||||
<h2 id="leapsec">Leap seconds</h2>
|
||||
<p>
|
||||
The <code><abbr>tz</abbr></code> code and data can account for leap seconds,
|
||||
thanks to code contributed by Bradley White.
|
||||
However, the leap second support of this package is rarely used directly
|
||||
because POSIX requires leap seconds to be excluded and many
|
||||
software packages would mishandle leap seconds if they were present.
|
||||
Instead, leap seconds are more commonly handled by occasionally adjusting
|
||||
the operating system kernel clock as described in
|
||||
<a href="tz-link.html#precision">Precision timekeeping</a>,
|
||||
and this package by default installs a <samp>leapseconds</samp> file
|
||||
commonly used by
|
||||
<a href="http://www.ntp.org"><abbr title="Network Time Protocol">NTP</abbr></a>
|
||||
software that adjusts the kernel clock.
|
||||
However, kernel-clock twiddling approximates UTC only roughly,
|
||||
and systems needing more-precise UTC can use this package's leap
|
||||
second support directly.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
The directly-supported mechanism assumes that <code>time_t</code>
|
||||
counts of seconds since the POSIX epoch normally include leap seconds,
|
||||
as opposed to POSIX <code>time_t</code> counts which exclude leap seconds.
|
||||
This modified timescale is converted to <abbr>UTC</abbr>
|
||||
at the same point that time zone and DST adjustments are applied –
|
||||
namely, at calls to <code>localtime</code> and analogous functions –
|
||||
and the process is driven by leap second information
|
||||
stored in alternate versions of the <abbr>TZif</abbr> files.
|
||||
Because a leap second adjustment may be needed even
|
||||
if no time zone correction is desired,
|
||||
calls to <code>gmtime</code>-like functions
|
||||
also need to consult a <abbr>TZif</abbr> file,
|
||||
conventionally named <samp><abbr>GMT</abbr></samp>,
|
||||
to see whether leap second corrections are needed.
|
||||
To convert an application's <code>time_t</code> timestamps to or from
|
||||
POSIX <code>time_t</code> timestamps (for use when, say,
|
||||
embedding or interpreting timestamps in portable
|
||||
<a href="https://en.wikipedia.org/wiki/Tar_(computing)"><code>tar</code></a>
|
||||
files),
|
||||
the application can call the utility functions
|
||||
<code>time2posix</code> and <code>posix2time</code>
|
||||
included with this package.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
If the POSIX-compatible <abbr>TZif</abbr> file set is installed
|
||||
in a directory whose basename is <samp>zoneinfo</samp>, the
|
||||
leap-second-aware file set is by default installed in a separate
|
||||
directory <samp>zoneinfo-leaps</samp>.
|
||||
Although each process can have its own time zone by setting
|
||||
its <code>TZ</code> environment variable, there is no support for some
|
||||
processes being leap-second aware while other processes are
|
||||
POSIX-compatible; the leap-second choice is system-wide.
|
||||
So if you configure your kernel to count leap seconds, you should also
|
||||
discard <samp>zoneinfo</samp> and rename <samp>zoneinfo-leaps</samp>
|
||||
to <samp>zoneinfo</samp>.
|
||||
Alternatively, you can install just one set of <abbr>TZif</abbr> files
|
||||
in the first place; see the <code>REDO</code> variable in this package's
|
||||
<a href="https://en.wikipedia.org/wiki/Makefile">makefile</a>.
|
||||
</p>
|
||||
</section>
|
||||
|
||||
<section>
|
||||
<h2 id="calendar">Calendrical issues</h2>
|
||||
<p>
|
||||
|
||||
@ -1 +1 @@
|
||||
2019b
|
||||
2019c
|
||||
|
||||
Loading…
Reference in New Issue
Block a user