From 798c0c0b01bf418d5d37ae1d3f0c3b7eb7ff76ff Mon Sep 17 00:00:00 2001 From: Philip Paeps Date: Thu, 12 Sep 2019 00:19:16 +0000 Subject: [PATCH] Import tzdata 2019c Changes: https://github.com/eggert/tz/blob/2019c/NEWS MFC after: 3 days --- contrib/tzdata/NEWS | 75 ++++++++++++ contrib/tzdata/asia | 23 ++-- contrib/tzdata/australasia | 42 ++++--- contrib/tzdata/backzone | 34 ++++-- contrib/tzdata/europe | 186 ++++++++++++++++++++--------- contrib/tzdata/leap-seconds.list | 8 +- contrib/tzdata/leapseconds | 41 ++++--- contrib/tzdata/leapseconds.awk | 195 ++++++++++++++++++++++++------- contrib/tzdata/northamerica | 132 +++++++++++++++------ contrib/tzdata/southamerica | 11 +- contrib/tzdata/theory.html | 77 +++++++++++- contrib/tzdata/version | 2 +- 12 files changed, 633 insertions(+), 193 deletions(-) diff --git a/contrib/tzdata/NEWS b/contrib/tzdata/NEWS index 8b05f8f13084..af0f06f7192d 100644 --- a/contrib/tzdata/NEWS +++ b/contrib/tzdata/NEWS @@ -1,5 +1,80 @@ News for the tz database +Release 2019c - 2019-09-11 08:59:48 -0700 + + Briefly: + Fiji observes DST from 2019-11-10 to 2020-01-12. + Norfolk Island starts observing Australian-style DST. + + Changes to future timestamps + + Fiji's next DST transitions will be 2019-11-10 and 2020-01-12 + instead of 2019-11-03 and 2020-01-19. (Thanks to Raymond Kumar.) + Adjust future guesses accordingly. + + Norfolk Island will observe Australian-style DST starting in + spring 2019. The first transition is on 2019-10-06. (Thanks to + Kyle Czech and Michael Deckers.) + + Changes to past timestamps + + Many corrections to time in Turkey from 1940 through 1985. + (Thanks to Oya Vulaş via Alois Treindl, and to Kıvanç Yazan.) + + The Norfolk Island 1975-03-02 transition was at 02:00 standard + time, not 02:00 DST. (Thanks to Michael Deckers.) + + South Korea observed DST from 1948 through 1951. Although this + info was supposed to appear in release 2014j, a typo inadvertently + suppressed the change. (Thanks to Alois Treindl.) + + Detroit observed DST in 1967 and 1968 following the US DST rules, + except that its 1967 DST began on June 14 at 00:01. (Thanks to + Alois Treindl for pointing out that the old data entries were + probably wrong.) + + Fix several errors in pre-1970 transitions in Perry County, IN. + (Thanks to Alois Triendl for pointing out the 1967/9 errors.) + + Edmonton did not observe DST in 1967 or 1969. In 1946 Vancouver + ended DST on 09-29 not 10-13, and Vienna ended DST on 10-07 not + 10-06. In 1945 Königsberg (now Kaliningrad) switched from +01/+02 + to +02/+03 on 04-10 not 01-01, and its +02/+03 is abbreviated + EET/EEST, not CET/CEST. (Thanks to Alois Triendl.) In 1946 + Königsberg switched to +03 on 04-07 not 01-01. + + In 1946 Louisville switched from CST to CDT on 04-28 at 00:01, not + 01-01 at 00:00. (Thanks to Alois Treindl and Michael Deckers.) + Also, it switched from CST to CDT on 1950-04-30, not 1947-04-27. + + The 1892-05-01 transition in Brussels was at 00:17:30, not at noon. + (Thanks to Michael Deckers.) + + Changes to past time zone abbreviations and DST flags + + Hong Kong Winter Time, observed from 1941-10-01 to 1941-12-25, + is now flagged as DST and is abbreviated HKWT not HKT. + + Changes to code + + leapseconds.awk now relies only on its input data, rather than + also relying on its comments. (Inspired by code from Dennis + Ferguson and Chris Woodbury.) + + The code now defends against CRLFs in leap-seconds.list. + (Thanks to Brian Inglis and Chris Woodbury.) + + Changes to documentation and commentary + + theory.html discusses leap seconds. (Thanks to Steve Summit.) + + Nashville's newspapers dueled about the time of day in the 1950s. + (Thanks to John Seigenthaler.) + + Liechtenstein observed Swiss DST in 1941/2. + (Thanks to Alois Treindl.) + + Release 2019b - 2019-07-01 00:09:53 -0700 Briefly: diff --git a/contrib/tzdata/asia b/contrib/tzdata/asia index 348e2b5df5ec..b29c896e5fde 100644 --- a/contrib/tzdata/asia +++ b/contrib/tzdata/asia @@ -8,7 +8,7 @@ # tz@iana.org for general use in the future). For more, please see # the file CONTRIBUTING in the tz distribution. -# From Paul Eggert (2018-06-19): +# From Paul Eggert (2019-07-11): # # Unless otherwise specified, the source for data through 1990 is: # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition), @@ -47,13 +47,13 @@ # 7:00 WIB west Indonesia (Waktu Indonesia Barat) # 8:00 WITA central Indonesia (Waktu Indonesia Tengah) # 8:00 CST China -# 8:00 PST PDT* Philippine Standard Time +# 8:00 HKT HKST Hong Kong (HKWT* for Winter Time in late 1941) +# 8:00 PST PDT* Philippines # 8:30 KST KDT Korea when at +0830 # 9:00 WIT east Indonesia (Waktu Indonesia Timur) # 9:00 JST JDT Japan # 9:00 KST KDT Korea when at +09 -# 9:30 ACST Australian Central Standard Time -# *I invented the abbreviation PDT; see "Philippines" below. +# *I invented the abbreviations HKWT and PDT; see below. # Otherwise, these tables typically use numeric abbreviations like +03 # and +0330 for integer hour and minute UT offsets. Although earlier # editions invented alphabetic time zone abbreviations for every @@ -653,6 +653,15 @@ Zone Asia/Urumqi 5:50:20 - LMT 1928 # * 1941-09-30, Hong Kong Daily Press, Winter Time Warning. # https://i.imgur.com/dge4kFJ.png +# From Paul Eggert (2019-07-11): +# "Hong Kong winter time" is considered to be daylight saving. +# "Hong Kong had adopted daylight saving on June 15 as a wartime measure, +# clocks moving forward one hour until October 1, when they would be put back +# by just half an hour for 'Hong Kong Winter time', so that daylight saving +# operated year round." -- Low Z. The longest day: when wartime Hong Kong +# introduced daylight saving. South China Morning Post. 2019-06-28. +# https://www.scmp.com/magazines/post-magazine/short-reads/article/3016281/longest-day-when-wartime-hong-kong-introduced + # From P Chan (2018-12-31): # * According to the Hong Kong Daylight-Saving Regulations, 1941, the # 1941 spring-forward transition was at 03:00. @@ -754,7 +763,7 @@ Rule HK 1979 only - Oct 21 3:30 0 - Zone Asia/Hong_Kong 7:36:42 - LMT 1904 Oct 30 0:36:42 8:00 - HKT 1941 Jun 15 3:00 8:00 1:00 HKST 1941 Oct 1 4:00 - 8:30 - HKT 1941 Dec 25 + 8:00 0:30 HKWT 1941 Dec 25 9:00 - JST 1945 Nov 18 2:00 8:00 HK HK%sT @@ -2419,7 +2428,7 @@ Rule ROK 1987 1988 - Oct Sun>=8 3:00 0 S Zone Asia/Seoul 8:27:52 - LMT 1908 Apr 1 8:30 - KST 1912 Jan 1 9:00 - JST 1945 Sep 8 - 9:00 - KST 1954 Mar 21 + 9:00 ROK K%sT 1954 Mar 21 8:30 ROK K%sT 1961 Aug 10 9:00 ROK K%sT Zone Asia/Pyongyang 8:23:00 - LMT 1908 Apr 1 @@ -3604,7 +3613,7 @@ Zone Asia/Tashkent 4:37:11 - LMT 1924 May 2 # and in South Vietnam in particular (after 1954): # To 07:00 on 1911-05-01. # To 08:00 on 1942-12-31 at 23:00. -# To 09:00 in 1945-03-14 at 23:00. +# To 09:00 on 1945-03-14 at 23:00. # To 07:00 on 1945-09-02 in Vietnam. # To 08:00 on 1947-04-01 in French-controlled Indochina. # To 07:00 on 1955-07-01 in South Vietnam. diff --git a/contrib/tzdata/australasia b/contrib/tzdata/australasia index 0544e587509a..ac44c0482170 100644 --- a/contrib/tzdata/australasia +++ b/contrib/tzdata/australasia @@ -367,13 +367,18 @@ Zone Indian/Cocos 6:27:40 - LMT 1900 # From Raymond Kumar (2018-07-13): # http://www.fijitimes.com/government-approves-2018-daylight-saving/ # ... The daylight saving period will end at 3am on Sunday January 13, 2019. -# -# From Paul Eggert (2018-07-15): -# For now, guess DST from 02:00 the first Sunday in November to 03:00 -# the first Sunday on or after January 13. January transitions reportedly + +# From Paul Eggert (2019-08-06): +# Today Raymond Kumar reported the Government of Fiji Gazette Supplement No. 27 +# (2019-08-02) said that Fiji observes DST "commencing at 2.00 am on +# Sunday, 10 November 2019 and ending at 3.00 am on Sunday, 12 January 2020." +# For now, guess DST from 02:00 the second Sunday in November to 03:00 +# the first Sunday on or after January 12. January transitions reportedly # depend on when school terms start. Although the guess is ad hoc, it matches -# transitions since late 2014 and seems more likely to match future -# practice than guessing no DST. +# transitions planned this year and seems more likely to match future practice +# than guessing no DST. +# From Michael Deckers (2019-08-06): +# https://www.laws.gov.fj/LawsAsMade/downloadfile/848 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Fiji 1998 1999 - Nov Sun>=1 2:00 1:00 - @@ -384,8 +389,9 @@ Rule Fiji 2010 2013 - Oct Sun>=21 2:00 1:00 - Rule Fiji 2011 only - Mar Sun>=1 3:00 0 - Rule Fiji 2012 2013 - Jan Sun>=18 3:00 0 - Rule Fiji 2014 only - Jan Sun>=18 2:00 0 - -Rule Fiji 2014 max - Nov Sun>=1 2:00 1:00 - -Rule Fiji 2015 max - Jan Sun>=13 3:00 0 - +Rule Fiji 2014 2018 - Nov Sun>=1 2:00 1:00 - +Rule Fiji 2015 max - Jan Sun>=12 3:00 0 - +Rule Fiji 2019 max - Nov Sun>=8 2:00 1:00 - # Zone NAME STDOFF RULES FORMAT [UNTIL] Zone Pacific/Fiji 11:55:44 - LMT 1915 Oct 26 # Suva 12:00 Fiji +12/+13 @@ -604,10 +610,11 @@ Zone Pacific/Niue -11:19:40 - LMT 1901 # Alofi # Zone NAME STDOFF RULES FORMAT [UNTIL] Zone Pacific/Norfolk 11:11:52 - LMT 1901 # Kingston 11:12 - +1112 1951 - 11:30 - +1130 1974 Oct 27 02:00 - 11:30 1:00 +1230 1975 Mar 2 02:00 - 11:30 - +1130 2015 Oct 4 02:00 - 11:00 - +11 + 11:30 - +1130 1974 Oct 27 02:00s + 11:30 1:00 +1230 1975 Mar 2 02:00s + 11:30 - +1130 2015 Oct 4 02:00s + 11:00 - +11 2019 Jul + 11:00 AN +11/+12 # Palau (Belau) # Zone NAME STDOFF RULES FORMAT [UNTIL] @@ -1875,12 +1882,21 @@ Zone Pacific/Wallis 12:15:20 - LMT 1901 # ... at 12.30 am (by legal time in New South Wales) on 4 October 2015. # http://www.norfolkisland.gov.nf/nia/MediaRelease/Media%20Release%20Norfolk%20Island%20Standard%20Time%20Change.pdf -# From Paul Eggert (2015-09-23): +# From Paul Eggert (2019-08-28): # Transitions before 2015 are from timeanddate.com, which consulted # the Norfolk Island Museum and the Australian Bureau of Meteorology's # Norfolk Island station, and found no record of Norfolk observing DST # other than in 1974/5. See: # https://www.timeanddate.com/time/australia/norfolk-island.html +# However, disagree with timeanddate about the 1975-03-02 transition; +# timeanddate has 02:00 but 02:00s corresponds to what the NSW law said +# (thanks to Michael Deckers). + +# Norfolk started observing Australian DST in spring 2019. +# From Kyle Czech (2019-08-13): +# https://www.legislation.gov.au/Details/F2018L01702 +# From Michael Deckers (2019-08-14): +# https://www.legislation.gov.au/Details/F2019C00010 # Palau # See commentary for Micronesia. diff --git a/contrib/tzdata/backzone b/contrib/tzdata/backzone index 2a54e6cee352..3ccadd139240 100644 --- a/contrib/tzdata/backzone +++ b/contrib/tzdata/backzone @@ -507,19 +507,35 @@ Zone Asia/Muscat 3:54:24 - LMT 1920 #Zone Asia/Panaji [not enough info to complete] # Cambodia -# From Paul Eggert (2014-10-11): -# See Asia/Ho_Chi_Minh for the source for most of this data. Also, guess -# (1) Cambodia reverted to UT +07 on 1945-09-02, when Vietnam did, and -# (2) they also reverted to +07 on 1953-11-09, the date of independence. -# These guesses are probably wrong but they're better than guessing no -# transitions there. + +# From an adoptive daughter of the late Cambodian ruler Prince Sihanouk, +# via Alois Treindl (2019-08-08): +# +# King Sihanouk said that, during the Japanese occupation, starting with +# what historians refer to as "le coup de force du 9 mars 1945", Cambodia, +# like the entire French Indochina, used Tokyo time zone. After Japan +# surrendered, 2 September 1945, Cambodia fell under French rule again and +# adopted Hanoi time zone again. +# +# However, on 7 January 1946, Sihanouk and Tioulong managed to obtain a +# status of "internal autonomy" from the government of Charles de Gaulle. +# Although many fields remained under the administration of the French +# (customs, taxes, justice, defence, foreign affairs, etc.), the Cambodian +# administration was responsible for religious matters and traditional +# celebrations, which included our calendar and time. The time zone was GMT +# + 7 and _no_ DST was applied. +# +# After Sihanouk and Tioulong achieved full independence, on 9 November 1953, +# GMT + 7 was maintained. + +# From Paul Eggert (2019-08-26): +# See Asia/Ho_Chi_Minh for the source for most of rest of this data. + Zone Asia/Phnom_Penh 6:59:40 - LMT 1906 Jul 1 7:06:30 - PLMT 1911 May 1 7:00 - +07 1942 Dec 31 23:00 8:00 - +08 1945 Mar 14 23:00 9:00 - +09 1945 Sep 2 - 7:00 - +07 1947 Apr 1 - 8:00 - +08 1953 Nov 9 7:00 - +07 # Israel @@ -646,7 +662,7 @@ Zone Europe/Tiraspol 1:58:32 - LMT 1880 # Liechtenstein Zone Europe/Vaduz 0:38:04 - LMT 1894 Jun - 1:00 - CET 1981 + 1:00 Swiss CE%sT 1981 1:00 EU CE%sT # Croatia diff --git a/contrib/tzdata/europe b/contrib/tzdata/europe index 5dc03976dbf5..361b396c026d 100644 --- a/contrib/tzdata/europe +++ b/contrib/tzdata/europe @@ -821,11 +821,16 @@ Zone Europe/Andorra 0:06:04 - LMT 1901 # Shanks & Pottenger give 02:00, the BEV 00:00. Go with the BEV, # and guess 02:00 for 1945-04-12. +# From Alois Triendl (2019-07-22): +# In 1946 the end of DST was on Monday, 7 October 1946, at 3:00 am. +# Shanks had this right. Source: Die Weltpresse, 5. Oktober 1946, page 5. + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Austria 1920 only - Apr 5 2:00s 1:00 S Rule Austria 1920 only - Sep 13 2:00s 0 - Rule Austria 1946 only - Apr 14 2:00s 1:00 S -Rule Austria 1946 1948 - Oct Sun>=1 2:00s 0 - +Rule Austria 1946 only - Oct 7 2:00s 0 - +Rule Austria 1947 1948 - Oct Sun>=1 2:00s 0 - Rule Austria 1947 only - Apr 6 2:00s 1:00 S Rule Austria 1948 only - Apr 18 2:00s 1:00 S Rule Austria 1980 only - Apr 6 0:00 1:00 S @@ -875,15 +880,35 @@ Zone Europe/Minsk 1:50:16 - LMT 1880 # Belgium # -# From Paul Eggert (1997-07-02): +# From Michael Deckers (2019-08-25): +# The exposition in the web page +# https://www.bestor.be/wiki/index.php/Voyager_dans_le_temps._L%E2%80%99introduction_de_la_norme_de_Greenwich_en_Belgique +# gives several contemporary sources from which one can conclude that +# the switch in Europe/Brussels on 1892-05-01 was from 00:17:30 to 00:00:00. +# +# From Paul Eggert (2019-08-28): +# This quote helps explain the late-1914 situation: +# In early November 1914, the Germans imposed the time zone used in central +# Europe and forced the inhabitants to set their watches and public clocks +# sixty minutes ahead. Many were reluctant to accept "German time" and +# continued to use "Belgian time" among themselves. Reflecting the spirit of +# resistance that arose in the population, a song made fun of this change.... +# The song ended: +# Putting your clock forward +# Will but hasten the happy hour +# When we kick out the Boches! +# See: Pluvinage G. Brussels on German time. Cahiers Bruxellois - +# Brusselse Cahiers. 2014;XLVI(1E):15-38. +# https://www.cairn.info/revue-cahiers-bruxellois-2014-1E-page-15.htm +# +# Entries from 1914 through 1917 are taken from "De tijd in België" +# . # Entries from 1918 through 1991 are taken from: # Annuaire de L'Observatoire Royal de Belgique, # Avenue Circulaire, 3, B-1180 BRUXELLES, CLVIIe année, 1991 # (Imprimerie HAYEZ, s.p.r.l., Rue Fin, 4, 1080 BRUXELLES, MCMXC), # pp 8-9. -# LMT before 1892 was 0:17:30, according to the official journal of Belgium: -# Moniteur Belge, Samedi 30 Avril 1892, N.121. -# Thanks to Pascal Delmoitie for these references. +# Thanks to Pascal Delmoitie for the 1918/1991 references. # The 1918 rules are listed for completeness; they apply to unoccupied Belgium. # Assume Brussels switched to WET in 1918 when the armistice took effect. # @@ -928,7 +953,7 @@ Rule Belgium 1946 only - May 19 2:00s 1:00 S Rule Belgium 1946 only - Oct 7 2:00s 0 - # Zone NAME STDOFF RULES FORMAT [UNTIL] Zone Europe/Brussels 0:17:30 - LMT 1880 - 0:17:30 - BMT 1892 May 1 12:00 # Brussels MT + 0:17:30 - BMT 1892 May 1 00:17:30 0:00 - WET 1914 Nov 8 1:00 - CET 1916 May 1 0:00 1:00 C-Eur CE%sT 1918 Nov 11 11:00u @@ -1627,6 +1652,13 @@ Zone Atlantic/Reykjavik -1:28 - LMT 1908 # advanced to sixty minutes later starting at hour two on 1944-04-02; ... # Starting at hour three on the date 1944-09-17 standard time will be resumed. # +# From Alois Triendl (2019-07-02): +# I spent 6 Euros to buy two archive copies of Il Messaggero, a Roman paper, +# for 1 and 2 April 1944. The edition of 2 April has this note: "Tonight at 2 +# am, put forward the clock by one hour. Remember that in the night between +# today and Monday the 'ora legale' will come in force again." That makes it +# clear that in Rome the change was on Monday, 3 April 1944 at 2 am. +# # From Paul Eggert (2016-10-27): # Go with INRiM for DST rules, except as corrected by Inglis for 1944 # for the Kingdom of Italy. This is consistent with Renzo Baldini. @@ -1774,15 +1806,10 @@ Zone Europe/Riga 1:36:34 - LMT 1880 # From Paul Eggert (2013-09-09): # Shanks & Pottenger say Vaduz is like Zurich. -# From Alois Treindl (2013-09-18): -# http://www.eliechtensteinensia.li/LIJ/1978/1938-1978/1941.pdf -# ... confirms on p. 6 that Liechtenstein followed Switzerland in 1941 and 1942. -# I ... translate only the last two paragraphs: -# ... 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. +# 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 diff --git a/contrib/tzdata/leap-seconds.list b/contrib/tzdata/leap-seconds.list index fd3d192ea9ff..a1bc5a782a83 100644 --- a/contrib/tzdata/leap-seconds.list +++ b/contrib/tzdata/leap-seconds.list @@ -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 diff --git a/contrib/tzdata/leapseconds b/contrib/tzdata/leapseconds index 886ae273e159..7808df8f894f 100644 --- a/contrib/tzdata/leapseconds +++ b/contrib/tzdata/leapseconds @@ -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 # -# or -# or . +# or . # For more about leap-seconds.list, please see # The NTP Timescale and Leap Seconds # . -# 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) +# . +# 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 # . # 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 # . -# 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 diff --git a/contrib/tzdata/leapseconds.awk b/contrib/tzdata/leapseconds.awk index 242e9d64098f..1fe50120afda 100644 --- a/contrib/tzdata/leapseconds.awk +++ b/contrib/tzdata/leapseconds.awk @@ -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 "# " - print "# or " - print "# or ." + print "# or ." print "# For more about leap-seconds.list, please see" print "# The NTP Timescale and Leap Seconds" print "# ." 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 "# ." + 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 "# ." 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 "# ." 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 +} diff --git a/contrib/tzdata/northamerica b/contrib/tzdata/northamerica index 9e3577bca697..8771d96e64e8 100644 --- a/contrib/tzdata/northamerica +++ b/contrib/tzdata/northamerica @@ -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 +# . +# +# 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 # # [PDF] (1914-03) # -# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94 -# . -# # 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] diff --git a/contrib/tzdata/southamerica b/contrib/tzdata/southamerica index 397a2cc3acd4..9b679c61435f 100644 --- a/contrib/tzdata/southamerica +++ b/contrib/tzdata/southamerica @@ -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 - diff --git a/contrib/tzdata/theory.html b/contrib/tzdata/theory.html index e0b32335867d..7af7cb23c657 100644 --- a/contrib/tzdata/theory.html +++ b/contrib/tzdata/theory.html @@ -21,6 +21,7 @@ database
  • Time and date functions
  • Interface stability
    • +
  • Leap seconds
  • Calendrical issues
  • Time and time zones on other planets
    • @@ -98,8 +99,9 @@ A tz 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 UTC, +are variable. It does not always make sense to talk about a timezone's "base offset", which is not necessarily a single number.

    @@ -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 zic. that do not fit into the POSIX model.
  • - POSIX requires that systems ignore leap seconds. + POSIX requires that time_t clock counts exclude leap + seconds.
  • The tz code attempts to support all the @@ -1072,7 +1075,8 @@ an older zic. where time_t is signed.
  • - These functions can account for leap seconds, thanks to Bradley White. + These functions can account for leap seconds; + see Leap seconds below.
    • @@ -1248,6 +1252,69 @@ between now and the future time.

    +
    +

    Leap seconds

    +

    +The tz 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 +Precision timekeeping, +and this package by default installs a leapseconds file +commonly used by +NTP +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. +

    + +

    +The directly-supported mechanism assumes that time_t +counts of seconds since the POSIX epoch normally include leap seconds, +as opposed to POSIX time_t counts which exclude leap seconds. +This modified timescale is converted to UTC +at the same point that time zone and DST adjustments are applied – +namely, at calls to localtime and analogous functions – +and the process is driven by leap second information +stored in alternate versions of the TZif files. +Because a leap second adjustment may be needed even +if no time zone correction is desired, +calls to gmtime-like functions +also need to consult a TZif file, +conventionally named GMT, +to see whether leap second corrections are needed. +To convert an application's time_t timestamps to or from +POSIX time_t timestamps (for use when, say, +embedding or interpreting timestamps in portable +tar +files), +the application can call the utility functions +time2posix and posix2time +included with this package. +

    + +

    +If the POSIX-compatible TZif file set is installed +in a directory whose basename is zoneinfo, the +leap-second-aware file set is by default installed in a separate +directory zoneinfo-leaps. +Although each process can have its own time zone by setting +its TZ 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 zoneinfo and rename zoneinfo-leaps +to zoneinfo. +Alternatively, you can install just one set of TZif files +in the first place; see the REDO variable in this package's +makefile. +

    +
    +

    Calendrical issues

    diff --git a/contrib/tzdata/version b/contrib/tzdata/version index 8d4a43baf40b..db18f8311daf 100644 --- a/contrib/tzdata/version +++ b/contrib/tzdata/version @@ -1 +1 @@ -2019b +2019c