From 3982cad2a7d3984e03a8c0c9533e571176dcd082 Mon Sep 17 00:00:00 2001 From: Philip Paeps Date: Fri, 2 Feb 2024 10:01:39 +0800 Subject: [PATCH] contrib/tzdata: import tzdata 2024a Changes: https://github.com/eggert/tz/blob/2024a/NEWS Approved by: so Security: FreeBSD-EN-24:01.tzdata (cherry picked from commit 2723c7ffb7f729a1d3f7c59e7db48b0edf3d30a6) (cherry picked from commit f4256acec1c980b7d08e9e526be6d2a7c4751f0b) --- contrib/tzdata/Makefile | 53 ++++- contrib/tzdata/NEWS | 68 ++++++ contrib/tzdata/africa | 8 +- contrib/tzdata/asia | 174 ++++++++------ contrib/tzdata/australasia | 14 +- contrib/tzdata/checknow.awk | 2 +- contrib/tzdata/etcetera | 2 +- contrib/tzdata/europe | 29 ++- contrib/tzdata/leap-seconds.list | 373 ++++++++++--------------------- contrib/tzdata/leapseconds | 19 +- contrib/tzdata/leapseconds.awk | 11 +- contrib/tzdata/northamerica | 29 ++- contrib/tzdata/southamerica | 5 +- contrib/tzdata/theory.html | 37 +-- contrib/tzdata/version | 2 +- contrib/tzdata/zishrink.awk | 98 +++++--- contrib/tzdata/zonenow.tab | 4 +- 17 files changed, 507 insertions(+), 421 deletions(-) diff --git a/contrib/tzdata/Makefile b/contrib/tzdata/Makefile index 4e45f93b915..d48354c72df 100644 --- a/contrib/tzdata/Makefile +++ b/contrib/tzdata/Makefile @@ -53,7 +53,7 @@ DATAFORM= main LOCALTIME= Factory -# The POSIXRULES macro controls interpretation of POSIX-like TZ +# The POSIXRULES macro controls interpretation of POSIX-2017.1-like TZ # settings like TZ='EET-2EEST' that lack DST transition rules. # If POSIXRULES is '-', no template is installed; this is the default. # Any other value for POSIXRULES is obsolete and should not be relied on, as: @@ -274,7 +274,7 @@ LDLIBS= # -DTZ_DOMAINDIR=\"/path\" to use "/path" for gettext directory; # the default is system-supplied, typically "/usr/lib/locale" # -DTZDEFRULESTRING=\",date/time,date/time\" to default to the specified -# DST transitions for POSIX-style TZ strings lacking them, +# DST transitions for POSIX.1-2017-style TZ strings lacking them, # in the usual case where POSIXRULES is '-'. If not specified, # TZDEFRULESTRING defaults to US rules for future DST transitions. # This mishandles some past timestamps, as US DST rules have changed. @@ -340,9 +340,10 @@ GCC_DEBUG_FLAGS = -DGCC_LINT -g3 -O3 -fno-common \ # guess TM_GMTOFF from other macros; define NO_TM_GMTOFF to suppress this. # Similarly, if your system has a "zone abbreviation" field, define # -DTM_ZONE=tm_zone -# and define NO_TM_ZONE to suppress any guessing. Although these two fields -# not required by POSIX, a future version of POSIX is planned to require them -# and they are widely available on GNU/Linux and BSD systems. +# and define NO_TM_ZONE to suppress any guessing. +# Although these two fields are not required by POSIX.1-2017, +# POSIX 202x/D4 requires them and they are widely available +# on GNU/Linux and BSD systems. # # The next batch of options control support for external variables # exported by tzcode. In practice these variables are less useful @@ -352,7 +353,7 @@ GCC_DEBUG_FLAGS = -DGCC_LINT -g3 -O3 -fno-common \ # # -DHAVE_TZNAME=0 # do not support "tzname" # # -DHAVE_TZNAME=1 # support "tzname", which is defined by system library # # -DHAVE_TZNAME=2 # support and define "tzname" -# # to the "CFLAGS=" line. "tzname" is required by POSIX 1988 and later. +# # to the "CFLAGS=" line. "tzname" is required by POSIX.1-1988 and later. # # If not defined, the code attempts to guess HAVE_TZNAME from other macros. # # Warning: unless time_tz is also defined, HAVE_TZNAME=1 can cause # # crashes when combined with some platforms' standard libraries, @@ -362,8 +363,8 @@ GCC_DEBUG_FLAGS = -DGCC_LINT -g3 -O3 -fno-common \ # # -DUSG_COMPAT=0 # do not support # # -DUSG_COMPAT=1 # support, and variables are defined by system library # # -DUSG_COMPAT=2 # support and define variables -# # to the "CFLAGS=" line; "timezone" and "daylight" are inspired by -# # Unix Systems Group code and are required by POSIX 2008 (with XSI) and later. +# # to the "CFLAGS=" line; "timezone" and "daylight" are inspired by Unix +# # Systems Group code and are required by POSIX.1-2008 and later (with XSI). # # If not defined, the code attempts to guess USG_COMPAT from other macros. # # # # To support the external variable "altzone", add @@ -427,7 +428,7 @@ GCC_DEBUG_FLAGS = -DGCC_LINT -g3 -O3 -fno-common \ # The name of a POSIX-like library archiver, its flags, C compiler, # linker flags, and 'make' utility. Ordinarily the defaults suffice. -# The commented-out values are the defaults specified by POSIX 202x/D3. +# The commented-out values are the defaults specified by POSIX.1-202x/D4. #AR = ar #ARFLAGS = -rv #CC = c17 @@ -439,6 +440,12 @@ GCC_DEBUG_FLAGS = -DGCC_LINT -g3 -O3 -fno-common \ LEAPSECONDS= +# Where to fetch leap-seconds.list from. +leaplist_URI = \ + https://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list +# The file is generated by the IERS Earth Orientation Centre, in Paris. +leaplist_TZ = Europe/Paris + # The zic command and its arguments. zic= ./zic @@ -471,7 +478,8 @@ AWK= awk # is typically nicer if it works. KSHELL= /bin/bash -# Name of curl , used for HTML validation. +# Name of curl , used for HTML validation +# and to fetch leap-seconds.list from upstream. CURL= curl # Name of GNU Privacy Guard , used to sign distributions. @@ -718,6 +726,28 @@ leapseconds: $(LEAP_DEPS) -f leapseconds.awk leap-seconds.list >$@.out mv $@.out $@ +# Awk script to extract a Git-style author from leap-seconds.list comments. +EXTRACT_AUTHOR = \ + author_line { sub(/^.[[:space:]]*/, ""); \ + sub(/:[[:space:]]*/, " <"); \ + printf "%s>\n", $$0; \ + success = 1; \ + exit \ + } \ + /Questions or comments to:/ { author_line = 1 } \ + END { exit !success } + +# Fetch leap-seconds.list from upstream. +fetch-leap-seconds.list: + $(CURL) -OR $(leaplist_URI) + +# Fetch leap-seconds.list from upstream and commit it to the local repository. +commit-leap-seconds.list: fetch-leap-seconds.list + author=$$($(AWK) '$(EXTRACT_AUTHOR)' leap-seconds.list) && \ + date=$$(TZ=$(leaplist_TZ) stat -c%y leap-seconds.list) && \ + git commit --author="$$author" --date="$$date" -m'make $@' \ + leap-seconds.list + # Arguments to pass to submakes of install_data. # They can be overridden by later submake arguments. INSTALLARGS = \ @@ -1315,7 +1345,8 @@ zic.o: private.h tzfile.h tzdir.h version.h .PHONY: ALL INSTALL all .PHONY: check check_mild check_time_t_alternatives .PHONY: check_web check_zishrink -.PHONY: clean clean_misc dummy.zd force_tzs +.PHONY: clean clean_misc commit-leap-seconds.list dummy.zd +.PHONY: fetch-leap-seconds.list force_tzs .PHONY: install install_data maintainer-clean names .PHONY: posix_only posix_right public .PHONY: rearguard_signatures rearguard_signatures_version diff --git a/contrib/tzdata/NEWS b/contrib/tzdata/NEWS index 031ba6a8a25..d407342a50e 100644 --- a/contrib/tzdata/NEWS +++ b/contrib/tzdata/NEWS @@ -1,5 +1,73 @@ News for the tz database +Release 2024a - 2024-02-01 09:28:56 -0800 + + Briefly: + Kazakhstan unifies on UTC+5 beginning 2024-03-01. + Palestine springs forward a week later after Ramadan. + zic no longer pretends to support indefinite-past DST. + localtime no longer mishandles Ciudad Juárez in 2422. + + Changes to future timestamps + + Kazakhstan unifies on UTC+5. This affects Asia/Almaty and + Asia/Qostanay which together represent the eastern portion of the + country that will transition from UTC+6 on 2024-03-01 at 00:00 to + join the western portion. (Thanks to Zhanbolat Raimbekov.) + + Palestine springs forward a week later than previously predicted + in 2024 and 2025. (Thanks to Heba Hamad.) Change spring-forward + predictions to the second Saturday after Ramadan, not the first; + this also affects other predictions starting in 2039. + + Changes to past timestamps + + Asia/Ho_Chi_Minh's 1955-07-01 transition occurred at 01:00 + not 00:00. (Thanks to Đoàn Trần Công Danh.) + + From 1947 through 1949, Toronto's transitions occurred at 02:00 + not 00:00. (Thanks to Chris Walton.) + + In 1911 Miquelon adopted standard time on June 15, not May 15. + + Changes to code + + The FROM and TO columns of Rule lines can no longer be "minimum" + or an abbreviation of "minimum", because TZif files do not support + DST rules that extend into the indefinite past - although these + rules were supported when TZif files had only 32-bit data, this + stopped working when 64-bit TZif files were introduced in 1995. + This should not be a problem for realistic data, since DST was + first used in the 20th century. As a transition aid, FROM columns + like "minimum" are now diagnosed and then treated as if they were + the year 1900; this should suffice for TZif files on old systems + with only 32-bit time_t, and it is more compatible with bugs in + 2023c-and-earlier localtime.c. (Problem reported by Yoshito + Umaoka.) + + localtime and related functions no longer mishandle some + timestamps that occur about 400 years after a switch to a time + zone with a DST schedule. In 2023d data this problem was visible + for some timestamps in November 2422, November 2822, etc. in + America/Ciudad_Juarez. (Problem reported by Gilmore Davidson.) + + strftime %s now uses tm_gmtoff if available. (Problem and draft + patch reported by Dag-Erling Smørgrav.) + + Changes to build procedure + + The leap-seconds.list file is now copied from the IERS instead of + from its downstream counterpart at NIST, as the IERS version is + now in the public domain too and tends to be more up-to-date. + (Thanks to Martin Burnicki for liaisoning with the IERS.) + + Changes to documentation + + The strftime man page documents which struct tm members affect + which conversion specs, and that tzset is called. (Problems + reported by Robert Elz and Steve Summit.) + + Release 2023d - 2023-12-21 20:02:24 -0800 Briefly: diff --git a/contrib/tzdata/africa b/contrib/tzdata/africa index 6fae18c0979..92d823a0515 100644 --- a/contrib/tzdata/africa +++ b/contrib/tzdata/africa @@ -30,6 +30,10 @@ # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94. # https://www.jstor.org/stable/1774359 # +# For the 1911/1912 establishment of standard time in French possessions, see: +# Société Française de Physique, Recueil de constantes physiques (1913), +# page 752, 18b. +# # European-style abbreviations are commonly used along the Mediterranean. # For sub-Saharan Africa abbreviations were less standardized. # Previous editions of this database used WAT, CAT, SAT, and EAT @@ -113,7 +117,7 @@ Zone Atlantic/Cape_Verde -1:34:04 - LMT 1912 Jan 01 2:00u # Praia # Chad # Zone NAME STDOFF RULES FORMAT [UNTIL] -Zone Africa/Ndjamena 1:00:12 - LMT 1912 # N'Djamena +Zone Africa/Ndjamena 1:00:12 - LMT 1912 Jan 1 # N'Djamena 1:00 - WAT 1979 Oct 14 1:00 1:00 WAST 1980 Mar 8 1:00 - WAT @@ -139,7 +143,7 @@ Zone Africa/Ndjamena 1:00:12 - LMT 1912 # N'Djamena # Inaccessible, Nightingale: uninhabited # Zone NAME STDOFF RULES FORMAT [UNTIL] -Zone Africa/Abidjan -0:16:08 - LMT 1912 +Zone Africa/Abidjan -0:16:08 - LMT 1912 Jan 1 0:00 - GMT ############################################################################### diff --git a/contrib/tzdata/asia b/contrib/tzdata/asia index 04526c19693..05683b9ebaa 100644 --- a/contrib/tzdata/asia +++ b/contrib/tzdata/asia @@ -2457,18 +2457,33 @@ Zone Asia/Amman 2:23:44 - LMT 1931 # effective December 21st, 2018.... # http://adilet.zan.kz/rus/docs/P1800000817 (russian language). +# From Zhanbolat Raimbekov (2024-01-19): +# Kazakhstan (all parts) switching to UTC+5 on March 1, 2024 +# https://www.gov.kz/memleket/entities/mti/press/news/details/688998?lang=ru +# [in Russian] +# (2024-01-20): https://primeminister.kz/ru/decisions/19012024-20 +# +# From Alexander Krivenyshev (2024-01-19): +# According to a different news and the official web site for the Ministry of +# Trade and Integration of the Republic of Kazakhstan: +# https://en.inform.kz/news/kazakhstan-to-switch-to-single-hour-zone-mar-1-54ad0b/ + # Zone NAME STDOFF RULES FORMAT [UNTIL] # # Almaty (formerly Alma-Ata), representing most locations in Kazakhstan -# This includes KZ-AKM, KZ-ALA, KZ-ALM, KZ-AST, KZ-BAY, KZ-VOS, KZ-ZHA, -# KZ-KAR, KZ-SEV, KZ-PAV, and KZ-YUZ. +# This includes Abai/Abay (ISO 3166-2 code KZ-10), Aqmola/Akmola (KZ-11), +# Almaty (KZ-19), Almaty city (KZ-75), Astana city (KZ-71), +# East Kazkhstan (KZ-63), Jambyl/Zhambyl (KZ-31), Jetisu/Zhetysu (KZ-33), +# Karaganda (KZ-35), North Kazakhstan (KZ-59), Pavlodar (KZ-55), +# Shyumkent city (KZ-79), Turkistan (KZ-61), and Ulytau (KZ-62). Zone Asia/Almaty 5:07:48 - LMT 1924 May 2 # or Alma-Ata 5:00 - +05 1930 Jun 21 6:00 RussiaAsia +06/+07 1991 Mar 31 2:00s 5:00 RussiaAsia +05/+06 1992 Jan 19 2:00s 6:00 RussiaAsia +06/+07 2004 Oct 31 2:00s - 6:00 - +06 -# Qyzylorda (aka Kyzylorda, Kizilorda, Kzyl-Orda, etc.) (KZ-KZY) + 6:00 - +06 2024 Mar 1 0:00 + 5:00 - +05 +# Qyzylorda (aka Kyzylorda, Kizilorda, Kzyl-Orda, etc.) (KZ-43) Zone Asia/Qyzylorda 4:21:52 - LMT 1924 May 2 4:00 - +04 1930 Jun 21 5:00 - +05 1981 Apr 1 @@ -2481,8 +2496,7 @@ Zone Asia/Qyzylorda 4:21:52 - LMT 1924 May 2 5:00 RussiaAsia +05/+06 2004 Oct 31 2:00s 6:00 - +06 2018 Dec 21 0:00 5:00 - +05 -# -# Qostanay (aka Kostanay, Kustanay) (KZ-KUS) +# Qostanay (aka Kostanay, Kustanay) (KZ-39) # The 1991/2 rules are unclear partly because of the 1997 Turgai # reorganization. Zone Asia/Qostanay 4:14:28 - LMT 1924 May 2 @@ -2493,9 +2507,9 @@ Zone Asia/Qostanay 4:14:28 - LMT 1924 May 2 5:00 RussiaAsia +05/+06 1991 Mar 31 2:00s 4:00 RussiaAsia +04/+05 1992 Jan 19 2:00s 5:00 RussiaAsia +05/+06 2004 Oct 31 2:00s - 6:00 - +06 - -# Aqtöbe (aka Aktobe, formerly Aktyubinsk) (KZ-AKT) + 6:00 - +06 2024 Mar 1 0:00 + 5:00 - +05 +# Aqtöbe (aka Aktobe, formerly Aktyubinsk) (KZ-15) Zone Asia/Aqtobe 3:48:40 - LMT 1924 May 2 4:00 - +04 1930 Jun 21 5:00 - +05 1981 Apr 1 @@ -2505,7 +2519,7 @@ Zone Asia/Aqtobe 3:48:40 - LMT 1924 May 2 4:00 RussiaAsia +04/+05 1992 Jan 19 2:00s 5:00 RussiaAsia +05/+06 2004 Oct 31 2:00s 5:00 - +05 -# Mangghystaū (KZ-MAN) +# Mangghystaū (KZ-47) # Aqtau was not founded until 1963, but it represents an inhabited region, # so include timestamps before 1963. Zone Asia/Aqtau 3:21:04 - LMT 1924 May 2 @@ -2517,7 +2531,7 @@ Zone Asia/Aqtau 3:21:04 - LMT 1924 May 2 5:00 RussiaAsia +05/+06 1994 Sep 25 2:00s 4:00 RussiaAsia +04/+05 2004 Oct 31 2:00s 5:00 - +05 -# Atyraū (KZ-ATY) is like Mangghystaū except it switched from +# Atyraū (KZ-23) is like Mangghystaū except it switched from # +04/+05 to +05/+06 in spring 1999, not fall 1994. Zone Asia/Atyrau 3:27:44 - LMT 1924 May 2 3:00 - +03 1930 Jun 21 @@ -2528,7 +2542,7 @@ Zone Asia/Atyrau 3:27:44 - LMT 1924 May 2 5:00 RussiaAsia +05/+06 1999 Mar 28 2:00s 4:00 RussiaAsia +04/+05 2004 Oct 31 2:00s 5:00 - +05 -# West Kazakhstan (KZ-ZAP) +# West Kazakhstan (KZ-27) # From Paul Eggert (2016-03-18): # The 1989 transition is from USSR act No. 227 (1989-03-14). Zone Asia/Oral 3:25:24 - LMT 1924 May 2 # or Ural'sk @@ -3430,19 +3444,26 @@ Zone Asia/Karachi 4:28:12 - LMT 1907 # ... winter time will begin in Palestine from Saturday 10-28-2023, # 02:00 AM by 60 minutes back. # -# From Paul Eggert (2023-03-22): +# From Heba Hamad (2024-01-25): +# the summer time for the years 2024,2025 will begin in Palestine +# from Saturday at 02:00 AM by 60 minutes forward as shown below: +# year date +# 2024 2024-04-20 +# 2025 2025-04-12 +# +# From Paul Eggert (2024-01-25): # For now, guess that spring and fall transitions will normally # continue to use 2022's rules, that during DST Palestine will switch # to standard time at 02:00 the last Saturday before Ramadan and back -# to DST at 02:00 the first Saturday after Ramadan, and that +# to DST at 02:00 the second Saturday after Ramadan, and that # if the normal spring-forward or fall-back transition occurs during # Ramadan the former is delayed and the latter advanced. # To implement this, I predicted Ramadan-oriented transition dates for -# 2023 through 2086 by running the following program under GNU Emacs 28.2, +# 2026 through 2086 by running the following program under GNU Emacs 29.2, # with the results integrated by hand into the table below. # Predictions after 2086 are approximated without Ramadan. # -# (let ((islamic-year 1444)) +# (let ((islamic-year 1447)) # (require 'cal-islam) # (while (< islamic-year 1510) # (let ((a (calendar-islamic-to-absolute (list 9 1 islamic-year))) @@ -3451,6 +3472,7 @@ Zone Asia/Karachi 4:28:12 - LMT 1907 # (while (/= saturday (mod (setq a (1- a)) 7))) # (while (/= saturday (mod b 7)) # (setq b (1+ b))) +# (setq b (+ 7 b)) # (setq a (calendar-gregorian-from-absolute a)) # (setq b (calendar-gregorian-from-absolute b)) # (insert @@ -3501,84 +3523,84 @@ Rule Palestine 2021 only - Oct 29 1:00 0 - Rule Palestine 2022 only - Mar 27 0:00 1:00 S Rule Palestine 2022 2035 - Oct Sat<=30 2:00 0 - Rule Palestine 2023 only - Apr 29 2:00 1:00 S -Rule Palestine 2024 only - Apr 13 2:00 1:00 S -Rule Palestine 2025 only - Apr 5 2:00 1:00 S +Rule Palestine 2024 only - Apr 20 2:00 1:00 S +Rule Palestine 2025 only - Apr 12 2:00 1:00 S Rule Palestine 2026 2054 - Mar Sat<=30 2:00 1:00 S Rule Palestine 2036 only - Oct 18 2:00 0 - Rule Palestine 2037 only - Oct 10 2:00 0 - Rule Palestine 2038 only - Sep 25 2:00 0 - Rule Palestine 2039 only - Sep 17 2:00 0 - -Rule Palestine 2039 only - Oct 22 2:00 1:00 S -Rule Palestine 2039 2067 - Oct Sat<=30 2:00 0 - Rule Palestine 2040 only - Sep 1 2:00 0 - -Rule Palestine 2040 only - Oct 13 2:00 1:00 S +Rule Palestine 2040 only - Oct 20 2:00 1:00 S +Rule Palestine 2040 2067 - Oct Sat<=30 2:00 0 - Rule Palestine 2041 only - Aug 24 2:00 0 - -Rule Palestine 2041 only - Sep 28 2:00 1:00 S +Rule Palestine 2041 only - Oct 5 2:00 1:00 S Rule Palestine 2042 only - Aug 16 2:00 0 - -Rule Palestine 2042 only - Sep 20 2:00 1:00 S +Rule Palestine 2042 only - Sep 27 2:00 1:00 S Rule Palestine 2043 only - Aug 1 2:00 0 - -Rule Palestine 2043 only - Sep 12 2:00 1:00 S +Rule Palestine 2043 only - Sep 19 2:00 1:00 S Rule Palestine 2044 only - Jul 23 2:00 0 - -Rule Palestine 2044 only - Aug 27 2:00 1:00 S +Rule Palestine 2044 only - Sep 3 2:00 1:00 S Rule Palestine 2045 only - Jul 15 2:00 0 - -Rule Palestine 2045 only - Aug 19 2:00 1:00 S +Rule Palestine 2045 only - Aug 26 2:00 1:00 S Rule Palestine 2046 only - Jun 30 2:00 0 - -Rule Palestine 2046 only - Aug 11 2:00 1:00 S +Rule Palestine 2046 only - Aug 18 2:00 1:00 S Rule Palestine 2047 only - Jun 22 2:00 0 - -Rule Palestine 2047 only - Jul 27 2:00 1:00 S +Rule Palestine 2047 only - Aug 3 2:00 1:00 S Rule Palestine 2048 only - Jun 6 2:00 0 - -Rule Palestine 2048 only - Jul 18 2:00 1:00 S +Rule Palestine 2048 only - Jul 25 2:00 1:00 S Rule Palestine 2049 only - May 29 2:00 0 - -Rule Palestine 2049 only - Jul 3 2:00 1:00 S +Rule Palestine 2049 only - Jul 10 2:00 1:00 S Rule Palestine 2050 only - May 21 2:00 0 - -Rule Palestine 2050 only - Jun 25 2:00 1:00 S +Rule Palestine 2050 only - Jul 2 2:00 1:00 S Rule Palestine 2051 only - May 6 2:00 0 - -Rule Palestine 2051 only - Jun 17 2:00 1:00 S +Rule Palestine 2051 only - Jun 24 2:00 1:00 S Rule Palestine 2052 only - Apr 27 2:00 0 - -Rule Palestine 2052 only - Jun 1 2:00 1:00 S +Rule Palestine 2052 only - Jun 8 2:00 1:00 S Rule Palestine 2053 only - Apr 12 2:00 0 - -Rule Palestine 2053 only - May 24 2:00 1:00 S +Rule Palestine 2053 only - May 31 2:00 1:00 S Rule Palestine 2054 only - Apr 4 2:00 0 - -Rule Palestine 2054 only - May 16 2:00 1:00 S -Rule Palestine 2055 only - May 1 2:00 1:00 S -Rule Palestine 2056 only - Apr 22 2:00 1:00 S -Rule Palestine 2057 only - Apr 7 2:00 1:00 S -Rule Palestine 2058 max - Mar Sat<=30 2:00 1:00 S +Rule Palestine 2054 only - May 23 2:00 1:00 S +Rule Palestine 2055 only - May 8 2:00 1:00 S +Rule Palestine 2056 only - Apr 29 2:00 1:00 S +Rule Palestine 2057 only - Apr 14 2:00 1:00 S +Rule Palestine 2058 only - Apr 6 2:00 1:00 S +Rule Palestine 2059 max - Mar Sat<=30 2:00 1:00 S Rule Palestine 2068 only - Oct 20 2:00 0 - Rule Palestine 2069 only - Oct 12 2:00 0 - Rule Palestine 2070 only - Oct 4 2:00 0 - Rule Palestine 2071 only - Sep 19 2:00 0 - Rule Palestine 2072 only - Sep 10 2:00 0 - -Rule Palestine 2072 only - Oct 15 2:00 1:00 S +Rule Palestine 2072 only - Oct 22 2:00 1:00 S Rule Palestine 2072 max - Oct Sat<=30 2:00 0 - Rule Palestine 2073 only - Sep 2 2:00 0 - -Rule Palestine 2073 only - Oct 7 2:00 1:00 S +Rule Palestine 2073 only - Oct 14 2:00 1:00 S Rule Palestine 2074 only - Aug 18 2:00 0 - -Rule Palestine 2074 only - Sep 29 2:00 1:00 S +Rule Palestine 2074 only - Oct 6 2:00 1:00 S Rule Palestine 2075 only - Aug 10 2:00 0 - -Rule Palestine 2075 only - Sep 14 2:00 1:00 S +Rule Palestine 2075 only - Sep 21 2:00 1:00 S Rule Palestine 2076 only - Jul 25 2:00 0 - -Rule Palestine 2076 only - Sep 5 2:00 1:00 S +Rule Palestine 2076 only - Sep 12 2:00 1:00 S Rule Palestine 2077 only - Jul 17 2:00 0 - -Rule Palestine 2077 only - Aug 28 2:00 1:00 S +Rule Palestine 2077 only - Sep 4 2:00 1:00 S Rule Palestine 2078 only - Jul 9 2:00 0 - -Rule Palestine 2078 only - Aug 13 2:00 1:00 S +Rule Palestine 2078 only - Aug 20 2:00 1:00 S Rule Palestine 2079 only - Jun 24 2:00 0 - -Rule Palestine 2079 only - Aug 5 2:00 1:00 S +Rule Palestine 2079 only - Aug 12 2:00 1:00 S Rule Palestine 2080 only - Jun 15 2:00 0 - -Rule Palestine 2080 only - Jul 20 2:00 1:00 S +Rule Palestine 2080 only - Jul 27 2:00 1:00 S Rule Palestine 2081 only - Jun 7 2:00 0 - -Rule Palestine 2081 only - Jul 12 2:00 1:00 S +Rule Palestine 2081 only - Jul 19 2:00 1:00 S Rule Palestine 2082 only - May 23 2:00 0 - -Rule Palestine 2082 only - Jul 4 2:00 1:00 S +Rule Palestine 2082 only - Jul 11 2:00 1:00 S Rule Palestine 2083 only - May 15 2:00 0 - -Rule Palestine 2083 only - Jun 19 2:00 1:00 S +Rule Palestine 2083 only - Jun 26 2:00 1:00 S Rule Palestine 2084 only - Apr 29 2:00 0 - -Rule Palestine 2084 only - Jun 10 2:00 1:00 S +Rule Palestine 2084 only - Jun 17 2:00 1:00 S Rule Palestine 2085 only - Apr 21 2:00 0 - -Rule Palestine 2085 only - Jun 2 2:00 1:00 S +Rule Palestine 2085 only - Jun 9 2:00 1:00 S Rule Palestine 2086 only - Apr 13 2:00 0 - -Rule Palestine 2086 only - May 18 2:00 1:00 S +Rule Palestine 2086 only - May 25 2:00 1:00 S # Zone NAME STDOFF RULES FORMAT [UNTIL] Zone Asia/Gaza 2:17:52 - LMT 1900 Oct @@ -3606,7 +3628,7 @@ Zone Asia/Hebron 2:20:23 - LMT 1900 Oct # Philippines -# From Paul Eggert (2018-11-18): +# From Paul Eggert (2024-01-21): # The Spanish initially used American (west-of-Greenwich) time. # It is unknown what time Manila kept when the British occupied it from # 1762-10-06 through 1764-04; for now assume it kept American time. @@ -3614,7 +3636,7 @@ Zone Asia/Hebron 2:20:23 - LMT 1900 Oct # Philippines, issued a proclamation announcing that 1844-12-30 was to # be immediately followed by 1845-01-01; see R.H. van Gent's # History of the International Date Line -# https://www.staff.science.uu.nl/~gent0113/idl/idl_philippines.htm +# https://webspace.science.uu.nl/~gent0113/idl/idl_philippines.htm # The rest of the data entries are from Shanks & Pottenger. # From Jesper Nørgaard Welen (2006-04-26): @@ -4041,7 +4063,8 @@ Zone Asia/Tashkent 4:37:11 - LMT 1924 May 2 # The English-language name of Vietnam's most populous city is "Ho Chi Minh # City"; use Ho_Chi_Minh below to avoid a name of more than 14 characters. -# From Paul Eggert (2022-07-27) after a 2014 heads-up from Trần Ngọc Quân: +# From Paul Eggert (2024-01-14) after a 2014 heads-up from Trần Ngọc Quân +# and a 2024-01-14 heads-up from Đoàn Trần Công Danh: # Trần Tiến Bình's authoritative book "Lịch Việt Nam: thế kỷ XX-XXI (1901-2100)" # (Nhà xuất bản Văn Hoá - Thông Tin, Hanoi, 2005), pp 49-50, # is quoted verbatim in: @@ -4071,14 +4094,35 @@ Zone Asia/Tashkent 4:37:11 - LMT 1924 May 2 # # Trần cites the following sources; it's unclear which supplied the info above. # -# Hoàng Xuân Hãn: "Lịch và lịch Việt Nam". Tập san Khoa học Xã hội, -# No. 9, Paris, February 1982. +# Hoàng Xuân Hãn: "Lịch và lịch Việt Nam". Tập san Khoa học Xã hội, +# No. 9, Paris, February 1982. +# +# Lê Thành Lân: "Lịch và niên biểu lịch sử hai mươi thế kỷ (0001-2010)", +# NXB Thống kê, Hanoi, 2000. # -# Lê Thành Lân: "Lịch và niên biểu lịch sử hai mươi thế kỷ (0001-2010)", -# NXB Thống kê, Hanoi, 2000. +# Lê Thành Lân: "Lịch hai thế kỷ (1802-2010) và các lịch vĩnh cửu", +# NXB Thuận Hoá, Huế, 1995. # -# Lê Thành Lân: "Lịch hai thế kỷ (1802-2010) và các lịch vĩnh cửu", -# NXB Thuận Hoá, Huế, 1995. +# Here is the decision for the September 1945 transition: +# Võ Nguyên Giáp, Việt Nam Dân Quốc Công Báo, No. 1 (1945-09-29), page 13 +# http://baochi.nlv.gov.vn/baochi/cgi-bin/baochi?a=d&d=JwvzO19450929.2.5&dliv=none +# It says that on 1945-09-01 at 24:00, Vietnam moved back two hours, to +07. +# It also mentions a 1945-03-29 decree (by a Japanese Goveror-General) +# to set the time zone to +09, but does not say whether that decree +# merely legalized an earlier change to +09. +# +# July 1955 transition: +# Ngô Đình Diệm, Công Báo Việt Nam, No. 92 (1955-07-02), page 1780-1781 +# Ordinance (Dụ) No. 46 (1955-06-25) +# http://ddsnext.crl.edu/titles/32341#?c=0&m=29&s=0&cv=4&r=0&xywh=-89%2C342%2C1724%2C1216 +# It says that on 1955-07-01 at 01:00, South Vietnam moved back 1 hour (to +07). +# +# December 1959 transition: +# Ngô Đình Diệm, Công Báo Việt Nam Cộng Hòa, 1960 part 1 (1960-01-02), page 62 +# Decree (Sắc lệnh) No. 362-TTP (1959-12-30) +# http://ddsnext.crl.edu/titles/32341#?c=0&m=138&s=0&cv=793&r=0&xywh=-54%2C1504%2C1705%2C1202 +# It says that on 1959-12-31 at 23:00, South Vietnam moved forward 1 hour (to +08). + # Zone NAME STDOFF RULES FORMAT [UNTIL] #STDOFF 7:06:30.13 @@ -4086,9 +4130,9 @@ Zone Asia/Ho_Chi_Minh 7:06:30 - LMT 1906 Jul 1 7:06:30 - PLMT 1911 May 1 # Phù Liễn MT 7:00 - +07 1942 Dec 31 23:00 8:00 - +08 1945 Mar 14 23:00 - 9:00 - +09 1945 Sep 2 + 9:00 - +09 1945 Sep 1 24:00 7:00 - +07 1947 Apr 1 - 8:00 - +08 1955 Jul 1 + 8:00 - +08 1955 Jul 1 01:00 7:00 - +07 1959 Dec 31 23:00 8:00 - +08 1975 Jun 13 7:00 - +07 diff --git a/contrib/tzdata/australasia b/contrib/tzdata/australasia index dc98c1e2de1..0e9c2592e4b 100644 --- a/contrib/tzdata/australasia +++ b/contrib/tzdata/australasia @@ -420,11 +420,11 @@ Zone Pacific/Fiji 11:55:44 - LMT 1915 Oct 26 # Suva # French Polynesia # Zone NAME STDOFF RULES FORMAT [UNTIL] -Zone Pacific/Gambier -8:59:48 - LMT 1912 Oct # Rikitea +Zone Pacific/Gambier -8:59:48 - LMT 1912 Oct 1 # Rikitea -9:00 - -09 -Zone Pacific/Marquesas -9:18:00 - LMT 1912 Oct +Zone Pacific/Marquesas -9:18:00 - LMT 1912 Oct 1 -9:30 - -0930 -Zone Pacific/Tahiti -9:58:16 - LMT 1912 Oct # Papeete +Zone Pacific/Tahiti -9:58:16 - LMT 1912 Oct 1 # Papeete -10:00 - -10 # Clipperton (near North America) is administered from French Polynesia; # it is uninhabited. @@ -802,7 +802,7 @@ Zone Pacific/Apia 12:33:04 - LMT 1892 Jul 5 # Solomon Is # excludes Bougainville, for which see Papua New Guinea # Zone NAME STDOFF RULES FORMAT [UNTIL] -Zone Pacific/Guadalcanal 10:39:48 - LMT 1912 Oct # Honiara +Zone Pacific/Guadalcanal 10:39:48 - LMT 1912 Oct 1 # Honiara 11:00 - +11 # Tokelau @@ -963,6 +963,10 @@ Zone Pacific/Efate 11:13:16 - LMT 1912 Jan 13 # Vila # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94. # https://www.jstor.org/stable/1774359 # +# For the 1911/1912 establishment of standard time in French possessions, see: +# Société Française de Physique, Recueil de constantes physiques (1913), +# page 752, 18b. +# # A reliable and entertaining source about time zones is # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). # @@ -2039,7 +2043,7 @@ Zone Pacific/Efate 11:13:16 - LMT 1912 Jan 13 # Vila # ordaining - by a masterpiece of diplomatic flattery - that # the Fourth of July should be celebrated twice in that year." # This happened in 1892, according to the Evening News (Sydney) of 1892-07-20. -# https://www.staff.science.uu.nl/~gent0113/idl/idl.htm +# https://webspace.science.uu.nl/~gent0113/idl/idl_alaska_samoa.htm # Although Shanks & Pottenger says they both switched to UT -11:30 # in 1911, and to -11 in 1950. many earlier sources give -11 diff --git a/contrib/tzdata/checknow.awk b/contrib/tzdata/checknow.awk index d722c03fd68..57ff3c02e78 100644 --- a/contrib/tzdata/checknow.awk +++ b/contrib/tzdata/checknow.awk @@ -45,7 +45,7 @@ END { for (zone in zone_data) { data = zone_data[zone] if (!zonenow[data]) { - printf "checknow.tab should have one of:%s\n", zones[data] + printf "zonenow.tab should have one of:%s\n", zones[data] zonenow[data] = zone # This suppresses duplicate diagnostics. status = 1 } diff --git a/contrib/tzdata/etcetera b/contrib/tzdata/etcetera index 865a220c1f4..29fbed9b929 100644 --- a/contrib/tzdata/etcetera +++ b/contrib/tzdata/etcetera @@ -5,7 +5,7 @@ # These entries are for uses not otherwise covered by the tz database. # Their main practical use is for platforms like Android that lack -# support for POSIX-style TZ strings. On such platforms these entries +# support for POSIX.1-2017-style TZ strings. On such platforms these entries # can be useful if the timezone database is wrong or if a ship or # aircraft at sea is not in a timezone. diff --git a/contrib/tzdata/europe b/contrib/tzdata/europe index 27f821e7760..c6b5270316b 100644 --- a/contrib/tzdata/europe +++ b/contrib/tzdata/europe @@ -990,9 +990,34 @@ Zone Europe/Sofia 1:33:16 - LMT 1880 # Czech Republic (Czechia) # Slovakia # -# From Paul Eggert (2018-04-15): -# The source for Czech data is: Kdy začíná a končí letní čas. 2018-04-15. +# From Ivan Benovic (2024-01-30): +# https://www.slov-lex.sk/pravne-predpisy/SK/ZZ/1946/54/ +# (This is an official link to the Czechoslovak Summer Time Act of +# March 8, 1946 that authorizes the Czechoslovak government to set the +# exact dates of change to summer time and back to Central European Time. +# The act also implicitly confirms Central European Time as the +# official time zone of Czechoslovakia and currently remains in force +# in both the Czech Republic and Slovakia.) +# https://www.psp.cz/eknih/1945pns/tisky/t0216_00.htm +# (This is a link to the original legislative proposal dating back to +# February 22, 1946. The accompanying memorandum to the proposal says +# that an advisory committee on European railroad transportation that +# met in Brussels in October 1945 decided that the change of time +# should be carried out in all participating countries in a strictly +# coordinated manner....) +# +# From Paul Eggert (2024-01-30): +# The source for Czech data is: Kdy začíná a končí letní čas. # https://kalendar.beda.cz/kdy-zacina-a-konci-letni-cas +# Its main text disagrees with its quoted sources only in 1918, +# where the main text says spring and autumn transitions +# occurred at 02:00 and 03:00 respectively (as usual), +# whereas the 1918 source "Oznámení o zavedení letního času v roce 1918" +# says transitions were at 01:00 and 02:00 respectively. +# As the 1918 source appears to be a humorous piece, and it is +# unlikely that Prague would have disagreed with its neighbors by an hour, +# go with the main text for now. +# # We know of no English-language name for historical Czech winter time; # abbreviate it as "GMT", as it happened to be GMT. # diff --git a/contrib/tzdata/leap-seconds.list b/contrib/tzdata/leap-seconds.list index 3fe9a1210e3..e52effc257b 100644 --- a/contrib/tzdata/leap-seconds.list +++ b/contrib/tzdata/leap-seconds.list @@ -1,255 +1,120 @@ +# ATOMIC TIME. +# The Coordinated Universal Time (UTC) is the reference time scale derived +# from The "Temps Atomique International" (TAI) calculated by the Bureau +# International des Poids et Mesures (BIPM) using a worldwide network of atomic +# clocks. UTC differs from TAI by an integer number of seconds; it is the basis +# of all activities in the world. # -# In the following text, the symbol '#' introduces -# a comment, which continues from that symbol until -# the end of the line. A plain comment line has a -# whitespace character following the comment indicator. -# There are also special comment lines defined below. -# A special comment will always have a non-whitespace -# character in column 2. -# -# A blank line should be ignored. -# -# The following table shows the corrections that must -# be applied to compute International Atomic Time (TAI) -# from the Coordinated Universal Time (UTC) values that -# are transmitted by almost all time services. -# -# The first column shows an epoch as a number of seconds -# since 1 January 1900, 00:00:00 (1900.0 is also used to -# indicate the same epoch.) Both of these time stamp formats -# ignore the complexities of the time scales that were -# used before the current definition of UTC at the start -# of 1972. (See note 3 below.) -# The second column shows the number of seconds that -# must be added to UTC to compute TAI for any timestamp -# at or after that epoch. The value on each line is -# valid from the indicated initial instant until the -# epoch given on the next one or indefinitely into the -# future if there is no next line. -# (The comment on each line shows the representation of -# the corresponding initial epoch in the usual -# day-month-year format. The epoch always begins at -# 00:00:00 UTC on the indicated day. See Note 5 below.) -# -# Important notes: -# -# 1. Coordinated Universal Time (UTC) is often referred to -# as Greenwich Mean Time (GMT). The GMT time scale is no -# longer used, and the use of GMT to designate UTC is -# discouraged. -# -# 2. The UTC time scale is realized by many national -# laboratories and timing centers. Each laboratory -# identifies its realization with its name: Thus -# UTC(NIST), UTC(USNO), etc. The differences among -# these different realizations are typically on the -# order of a few nanoseconds (i.e., 0.000 000 00x s) -# and can be ignored for many purposes. These differences -# are tabulated in Circular T, which is published monthly -# by the International Bureau of Weights and Measures -# (BIPM). See www.bipm.org for more information. -# -# 3. The current definition of the relationship between UTC -# and TAI dates from 1 January 1972. A number of different -# time scales were in use before that epoch, and it can be -# quite difficult to compute precise timestamps and time -# intervals in those "prehistoric" days. For more information, -# consult: -# -# The Explanatory Supplement to the Astronomical -# Ephemeris. -# or -# Terry Quinn, "The BIPM and the Accurate Measurement -# of Time," Proc. of the IEEE, Vol. 79, pp. 894-905, -# July, 1991. -# reprinted in: -# Christine Hackman and Donald B Sullivan (eds.) -# Time and Frequency Measurement -# American Association of Physics Teachers (1996) -# , pp. 75-86 -# -# 4. The decision to insert a leap second into UTC is currently -# the responsibility of the International Earth Rotation and -# Reference Systems Service. (The name was changed from the -# International Earth Rotation Service, but the acronym IERS -# is still used.) -# -# Leap seconds are announced by the IERS in its Bulletin C. -# -# See www.iers.org for more details. -# -# Every national laboratory and timing center uses the -# data from the BIPM and the IERS to construct UTC(lab), -# their local realization of UTC. -# -# Although the definition also includes the possibility -# of dropping seconds ("negative" leap seconds), this has -# never been done and is unlikely to be necessary in the -# foreseeable future. -# -# 5. If your system keeps time as the number of seconds since -# some epoch (e.g., NTP timestamps), then the algorithm for -# assigning a UTC time stamp to an event that happens during a positive -# leap second is not well defined. The official name of that leap -# second is 23:59:60, but there is no way of representing that time -# in these systems. -# Many systems of this type effectively stop the system clock for -# one second during the leap second and use a time that is equivalent -# to 23:59:59 UTC twice. For these systems, the corresponding TAI -# timestamp would be obtained by advancing to the next entry in the -# following table when the time equivalent to 23:59:59 UTC -# is used for the second time. Thus the leap second which -# occurred on 30 June 1972 at 23:59:59 UTC would have TAI -# timestamps computed as follows: -# -# ... -# 30 June 1972 23:59:59 (2287785599, first time): TAI= UTC + 10 seconds -# 30 June 1972 23:59:60 (2287785599,second time): TAI= UTC + 11 seconds -# 1 July 1972 00:00:00 (2287785600) TAI= UTC + 11 seconds -# ... -# -# If your system realizes the leap second by repeating 00:00:00 UTC twice -# (this is possible but not usual), then the advance to the next entry -# in the table must occur the second time that a time equivalent to -# 00:00:00 UTC is used. Thus, using the same example as above: -# -# ... -# 30 June 1972 23:59:59 (2287785599): TAI= UTC + 10 seconds -# 30 June 1972 23:59:60 (2287785600, first time): TAI= UTC + 10 seconds -# 1 July 1972 00:00:00 (2287785600,second time): TAI= UTC + 11 seconds -# ... -# -# in both cases the use of timestamps based on TAI produces a smooth -# time scale with no discontinuity in the time interval. However, -# although the long-term behavior of the time scale is correct in both -# methods, the second method is technically not correct because it adds -# the extra second to the wrong day. -# -# This complexity would not be needed for negative leap seconds (if they -# are ever used). The UTC time would skip 23:59:59 and advance from -# 23:59:58 to 00:00:00 in that case. The TAI offset would decrease by -# 1 second at the same instant. This is a much easier situation to deal -# with, since the difficulty of unambiguously representing the epoch -# during the leap second does not arise. -# -# Some systems implement leap seconds by amortizing the leap second -# over the last few minutes of the day. The frequency of the local -# clock is decreased (or increased) to realize the positive (or -# negative) leap second. This method removes the time step described -# above. Although the long-term behavior of the time scale is correct -# in this case, this method introduces an error during the adjustment -# period both in time and in frequency with respect to the official -# definition of UTC. -# -# Questions or comments to: -# Judah Levine -# Time and Frequency Division -# NIST -# Boulder, Colorado -# Judah.Levine@nist.gov -# -# Last Update of leap second values: 8 July 2016 -# -# The following line shows this last update date in NTP timestamp -# format. This is the date on which the most recent change to -# the leap second data was added to the file. This line can -# be identified by the unique pair of characters in the first two -# columns as shown below. -# -#$ 3676924800 -# -# The NTP timestamps are in units of seconds since the NTP epoch, -# which is 1 January 1900, 00:00:00. The Modified Julian Day number -# corresponding to the NTP time stamp, X, can be computed as -# -# X/86400 + 15020 -# -# where the first term converts seconds to days and the second -# term adds the MJD corresponding to the time origin defined above. -# The integer portion of the result is the integer MJD for that -# day, and any remainder is the time of day, expressed as the -# fraction of the day since 0 hours UTC. The conversion from day -# fraction to seconds or to hours, minutes, and seconds may involve -# rounding or truncation, depending on the method used in the -# computation. -# -# The data in this file will be updated periodically as new leap -# seconds are announced. In addition to being entered on the line -# above, the update time (in NTP format) will be added to the basic -# file name leap-seconds to form the name leap-seconds.. -# In addition, the generic name leap-seconds.list will always point to -# the most recent version of the file. -# -# This update procedure will be performed only when a new leap second -# is announced. -# -# The following entry specifies the expiration date of the data -# in this file in units of seconds since the origin at the instant -# 1 January 1900, 00:00:00. This expiration date will be changed -# at least twice per year whether or not a new leap second is -# announced. These semi-annual changes will be made no later -# than 1 June and 1 December of each year to indicate what -# action (if any) is to be taken on 30 June and 31 December, -# respectively. (These are the customary effective dates for new -# leap seconds.) This expiration date will be identified by a -# unique pair of characters in columns 1 and 2 as shown below. -# In the unlikely event that a leap second is announced with an -# effective date other than 30 June or 31 December, then this -# file will be edited to include that leap second as soon as it is -# announced or at least one month before the effective date -# (whichever is later). -# If an announcement by the IERS specifies that no leap second is -# scheduled, then only the expiration date of the file will -# be advanced to show that the information in the file is still -# current -- the update time stamp, the data and the name of the file -# will not change. -# -# Updated through IERS Bulletin C66 -# File expires on: 28 June 2024 -# -#@ 3928521600 -# -2272060800 10 # 1 Jan 1972 -2287785600 11 # 1 Jul 1972 -2303683200 12 # 1 Jan 1973 -2335219200 13 # 1 Jan 1974 -2366755200 14 # 1 Jan 1975 -2398291200 15 # 1 Jan 1976 -2429913600 16 # 1 Jan 1977 -2461449600 17 # 1 Jan 1978 -2492985600 18 # 1 Jan 1979 -2524521600 19 # 1 Jan 1980 -2571782400 20 # 1 Jul 1981 -2603318400 21 # 1 Jul 1982 -2634854400 22 # 1 Jul 1983 -2698012800 23 # 1 Jul 1985 -2776982400 24 # 1 Jan 1988 -2840140800 25 # 1 Jan 1990 -2871676800 26 # 1 Jan 1991 -2918937600 27 # 1 Jul 1992 -2950473600 28 # 1 Jul 1993 -2982009600 29 # 1 Jul 1994 -3029443200 30 # 1 Jan 1996 -3076704000 31 # 1 Jul 1997 -3124137600 32 # 1 Jan 1999 -3345062400 33 # 1 Jan 2006 -3439756800 34 # 1 Jan 2009 -3550089600 35 # 1 Jul 2012 -3644697600 36 # 1 Jul 2015 -3692217600 37 # 1 Jan 2017 -# -# the following special comment contains the -# hash value of the data in this file computed -# use the secure hash algorithm as specified -# by FIPS 180-1. See the files in ~/pub/sha for -# the details of how this hash value is -# computed. Note that the hash computation -# ignores comments and whitespace characters -# in data lines. It includes the NTP values -# of both the last modification time and the -# expiration time of the file, but not the -# white space on those lines. -# the hash line is also ignored in the -# computation. -# -#h 16edd0f0 3666784f 37db6bdd e74ced87 59af48f1 +# +# ASTRONOMICAL TIME (UT1) is the time scale based on the rate of rotation of the earth. +# It is now mainly derived from Very Long Baseline Interferometry (VLBI). The various +# irregular fluctuations progressively detected in the rotation rate of the Earth lead +# in 1972 to the replacement of UT1 by UTC as the reference time scale. +# +# +# LEAP SECOND +# Atomic clocks are more stable than the rate of the earth rotation since the latter +# undergoes a full range of geophysical perturbations at various time scales: lunisolar +# and core-mantle torques, atmospheric and oceanic effetcs, etc. +# Leap seconds are needed to keep the two time scales in agreement, i.e. UT1-UTC smaller +# than 0.9 second. Therefore, when necessary a "leap second" is applied to UTC. +# Since the adoption of this system in 1972 it has been necessary to add a number of seconds to UTC, +# firstly due to the initial choice of the value of the second (1/86400 mean solar day of +# the year 1820) and secondly to the general slowing down of the Earth's rotation. It is +# theorically possible to have a negative leap second (a second removed from UTC), but so far, +# all leap seconds have been positive (a second has been added to UTC). Based on what we know about +# the earth's rotation, it is unlikely that we will ever have a negative leap second. +# +# +# HISTORY +# The first leap second was added on June 30, 1972. Until yhe year 2000, it was necessary in average to add a +# leap second at a rate of 1 to 2 years. Since the year 2000 leap seconds are introduced with an +# average interval of 3 to 4 years due to the acceleration of the Earth rotation speed. +# +# +# RESPONSABILITY OF THE DECISION TO INTRODUCE A LEAP SECOND IN UTC +# The decision to introduce a leap second in UTC is the responsibility of the Earth Orientation Center of +# the International Earth Rotation and reference System Service (IERS). This center is located at Paris +# Observatory. According to international agreements, leap seconds should only be scheduled for certain dates: +# first preference is given to the end of December and June, and second preference at the end of March +# and September. Since the introduction of leap seconds in 1972, only dates in June and December were used. +# +# Questions or comments to: +# Christian Bizouard: christian.bizouard@obspm.fr +# Earth orientation Center of the IERS +# Paris Observatory, France +# +# +# +# COPYRIGHT STATUS OF THIS FILE +# This file is in the public domain. +# +# +# VALIDITY OF THE FILE +# It is important to express the validity of the file. These next two dates are +# given in units of seconds since 1900.0. +# +# 1) Last update of the file. +# +# Updated through IERS Bulletin C (https://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat) +# +# The following line shows the last update of this file in NTP timestamp: +# +#$ 3913697179 +# +# 2) Expiration date of the file given on a semi-annual basis: last June or last December +# +# File expires on 28 December 2024 +# +# Expire date in NTP timestamp: +# +#@ 3944332800 +# +# +# LIST OF LEAP SECONDS +# NTP timestamp (X parameter) is the number of seconds since 1900.0 +# +# MJD: The Modified Julian Day number. MJD = X/86400 + 15020 +# +# DTAI: The difference DTAI= TAI-UTC in units of seconds +# It is the quantity to add to UTC to get the time in TAI +# +# Day Month Year : epoch in clear +# +#NTP Time DTAI Day Month Year +# +2272060800 10 # 1 Jan 1972 +2287785600 11 # 1 Jul 1972 +2303683200 12 # 1 Jan 1973 +2335219200 13 # 1 Jan 1974 +2366755200 14 # 1 Jan 1975 +2398291200 15 # 1 Jan 1976 +2429913600 16 # 1 Jan 1977 +2461449600 17 # 1 Jan 1978 +2492985600 18 # 1 Jan 1979 +2524521600 19 # 1 Jan 1980 +2571782400 20 # 1 Jul 1981 +2603318400 21 # 1 Jul 1982 +2634854400 22 # 1 Jul 1983 +2698012800 23 # 1 Jul 1985 +2776982400 24 # 1 Jan 1988 +2840140800 25 # 1 Jan 1990 +2871676800 26 # 1 Jan 1991 +2918937600 27 # 1 Jul 1992 +2950473600 28 # 1 Jul 1993 +2982009600 29 # 1 Jul 1994 +3029443200 30 # 1 Jan 1996 +3076704000 31 # 1 Jul 1997 +3124137600 32 # 1 Jan 1999 +3345062400 33 # 1 Jan 2006 +3439756800 34 # 1 Jan 2009 +3550089600 35 # 1 Jul 2012 +3644697600 36 # 1 Jul 2015 +3692217600 37 # 1 Jan 2017 +# +# A hash code has been generated to be able to verify the integrity +# of this file. For more information about using this hash code, +# please see the readme file in the 'source' directory : +# https://hpiers.obspm.fr/iers/bul/bulc/ntp/sources/README +# +#h 9dac5845 8acd32c0 2947d462 daf4a943 f58d9391 diff --git a/contrib/tzdata/leapseconds b/contrib/tzdata/leapseconds index 8938c763e0e..ce150bfe0dc 100644 --- a/contrib/tzdata/leapseconds +++ b/contrib/tzdata/leapseconds @@ -3,13 +3,10 @@ # This file is in the public domain. # This file is generated automatically from the data in the public-domain -# NIST format leap-seconds.list file, which can be copied from -# -# or . -# The NIST file is used instead of its IERS upstream counterpart +# NIST/IERS format leap-seconds.list file, which can be copied from # -# because under US law the NIST file is public domain -# whereas the IERS file's copyright and license status is unclear. +# or, in a variant with different comments, from +# . # For more about leap-seconds.list, please see # The NTP Timescale and Leap Seconds # . @@ -72,11 +69,11 @@ Leap 2016 Dec 31 23:59:60 + S # Any additional leap seconds will come after this. # This Expires line is commented out for now, # so that pre-2020a zic implementations do not reject this file. -#Expires 2024 Jun 28 00:00:00 +#Expires 2024 Dec 28 00:00:00 # POSIX timestamps for the data in this file: -#updated 1467936000 (2016-07-08 00:00:00 UTC) -#expires 1719532800 (2024-06-28 00:00:00 UTC) +#updated 1704708379 (2024-01-08 10:06:19 UTC) +#expires 1735344000 (2024-12-28 00:00:00 UTC) -# Updated through IERS Bulletin C66 -# File expires on: 28 June 2024 +# Updated through IERS Bulletin C (https://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat) +# File expires on 28 December 2024 diff --git a/contrib/tzdata/leapseconds.awk b/contrib/tzdata/leapseconds.awk index 7d2556bf1ca..15e85012bf9 100644 --- a/contrib/tzdata/leapseconds.awk +++ b/contrib/tzdata/leapseconds.awk @@ -1,4 +1,4 @@ -# Generate zic format 'leapseconds' from NIST format 'leap-seconds.list'. +# Generate zic format 'leapseconds' from NIST/IERS format 'leap-seconds.list'. # This file is in the public domain. @@ -21,13 +21,10 @@ BEGIN { print "# This file is in the public domain." print "" print "# This file is generated automatically from the data in the public-domain" - print "# NIST format leap-seconds.list file, which can be copied from" - print "# " - print "# or ." - print "# The NIST file is used instead of its IERS upstream counterpart" + print "# NIST/IERS format leap-seconds.list file, which can be copied from" print "# " - print "# because under US law the NIST file is public domain" - print "# whereas the IERS file's copyright and license status is unclear." + print "# or, in a variant with different comments, from" + print "# ." print "# For more about leap-seconds.list, please see" print "# The NTP Timescale and Leap Seconds" print "# ." diff --git a/contrib/tzdata/northamerica b/contrib/tzdata/northamerica index 8ac106ab222..bbfce49ba19 100644 --- a/contrib/tzdata/northamerica +++ b/contrib/tzdata/northamerica @@ -1268,6 +1268,10 @@ Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 # # [PDF] (1914-03) # +# For the 1911/1912 establishment of standard time in French possessions, see: +# Société Française de Physique, Recueil de constantes physiques (1913), +# page 752, 18b. +# # See the 'europe' file for Greenland. # Canada @@ -1354,7 +1358,7 @@ Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 # From Paul Eggert (2014-10-18): # H. David Matthews and Mary Vincent's map # "It's about TIME", _Canadian Geographic_ (September-October 1998) -# http://www.canadiangeographic.ca/Magazine/SO98/alacarte.asp +# https://web.archive.org/web/19990827055050/https://canadiangeographic.ca/SO98/geomap.htm # contains detailed boundaries for regions observing nonstandard # time and daylight saving time arrangements in Canada circa 1998. # @@ -1642,6 +1646,15 @@ Zone America/Moncton -4:19:08 - LMT 1883 Dec 9 # Some cities in the United States have pushed the deadline back # three weeks and will change over from daylight saving in October. +# From Chris Walton (2024-01-09): +# The [Toronto] changes in 1947, 1948, and 1949 took place at 2:00 a.m. local +# time instead of midnight.... Toronto Daily Star - ... +# April 2, 1947 - Page 39 ... April 7, 1948 - Page 13 ... +# April 2, 1949 - Page 1 ... April 7, 1949 - Page 24 ... +# November 25, 1949 - Page 52 ... April 21, 1950 - Page 14 ... +# September 19, 1950 - Page 46 ... September 20, 1950 - Page 3 ... +# November 24, 1950 - Page 21 + # From Arthur David Olson (2010-07-17): # # "Standard Time and Time Zones in Canada" appeared in @@ -1703,13 +1716,9 @@ Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S -Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S -Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D -Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D -Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S -Rule Toronto 1949 only - Nov lastSun 0:00 0 S -Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D -Rule Toronto 1950 only - Nov lastSun 2:00 0 S +Rule Toronto 1945 1948 - Sep lastSun 2:00 0 S +Rule Toronto 1946 1973 - Apr lastSun 2:00 1:00 D +Rule Toronto 1949 1950 - Nov lastSun 2:00 0 S Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S # Shanks & Pottenger say Toronto ended DST a week early in 1971, # namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this @@ -3432,7 +3441,7 @@ Zone America/Jamaica -5:07:10 - LMT 1890 # Kingston # Martinique # Zone NAME STDOFF RULES FORMAT [UNTIL] Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France - -4:04:20 - FFMT 1911 May # Fort-de-France MT + -4:04:20 - FFMT 1911 May 1 # Fort-de-France MT -4:00 - AST 1980 Apr 6 -4:00 1:00 ADT 1980 Sep 28 -4:00 - AST @@ -3539,7 +3548,7 @@ Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan # St Pierre and Miquelon # There are too many St Pierres elsewhere, so we'll use 'Miquelon'. # Zone NAME STDOFF RULES FORMAT [UNTIL] -Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre +Zone America/Miquelon -3:44:40 - LMT 1911 Jun 15 # St Pierre -4:00 - AST 1980 May -3:00 - -03 1987 -3:00 Canada -03/-02 diff --git a/contrib/tzdata/southamerica b/contrib/tzdata/southamerica index 19c7e4566cd..344e67f38f4 100644 --- a/contrib/tzdata/southamerica +++ b/contrib/tzdata/southamerica @@ -1570,8 +1570,11 @@ Zone Atlantic/Stanley -3:51:24 - LMT 1890 -3:00 - -03 # French Guiana +# For the 1911/1912 establishment of standard time in French possessions, see: +# Société Française de Physique, Recueil de constantes physiques (1913), +# page 752, 18b. # Zone NAME STDOFF RULES FORMAT [UNTIL] -Zone America/Cayenne -3:29:20 - LMT 1911 Jul +Zone America/Cayenne -3:29:20 - LMT 1911 Jul 1 -4:00 - -04 1967 Oct -3:00 - -03 diff --git a/contrib/tzdata/theory.html b/contrib/tzdata/theory.html index 369c75433ff..516d2a52511 100644 --- a/contrib/tzdata/theory.html +++ b/contrib/tzdata/theory.html @@ -95,7 +95,7 @@ Group Base Specifications Issue 7, IEEE Std 1003.1-2017, 2018 Edition. Because the database's scope encompasses real-world changes to civil timekeeping, its model for describing time is more complex than the -standard and daylight saving times supported by POSIX. +standard and daylight saving times supported by POSIX.1-2017. 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 @@ -187,7 +187,7 @@ in decreasing order of importance: href="https://en.wikipedia.org/wiki/ASCII">ASCII letters, '.', '-' and '_'. Do not use digits, as that might create an ambiguity with POSIX + href="https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html#tag_08_03">POSIX.1-2017 TZ strings. A file name component must not exceed 14 characters or start with '-'. @@ -362,6 +362,11 @@ The backward-compatibility file zone.tab is similar but conforms to the older-version guidelines related to ISO 3166-1; it lists only one country code per entry and unlike zone1970.tab it can list names defined in backward. +Applications that process only timestamps from now on can instead use the file +zonenow.tab, which partitions the world more coarsely, +into regions where clocks agree now and in the predicted future; +this file is smaller and simpler than zone1970.tab +and zone.tab.

@@ -373,7 +378,7 @@ nowadays distributions typically use it and no great weight should be attached to whether a link is defined in backward or in some other file. The source file etcetera defines names that may be useful -on platforms that do not support POSIX-style TZ strings; +on platforms that do not support POSIX.1-2017-style TZ strings; no other source file other than backward contains links to its zones. One of etcetera's names is Etc/UTC, @@ -421,7 +426,7 @@ in decreasing order of importance: expression [-+[:alnum:]]{3,6} should match the abbreviation. This guarantees that all abbreviations could have been specified by a - POSIX TZ string. + POSIX.1-2017 TZ string.

  • @@ -765,12 +770,12 @@ href="https://www.dissentmagazine.org/blog/booked-a-global-history-of-time-vanes calendar with 24-hour days. These divergences range from relatively minor, such as Japanese bars giving times like "24:30" for the wee hours of the morning, to more-significant differences such as the + href="https://theworld.org/stories/2015-01-30/if-you-have-meeting-ethiopia-you-better-double-check-time">the east African practice of starting the day at dawn, renumbering the Western 06:00 to be 12:00. These practices are largely outside the scope of the tz code and data, which provide only limited support for date and time localization - such as that required by POSIX. + such as that required by POSIX.1-2017. If DST is not used a different time zone can often do the trick; for example, in Kenya a TZ setting like <-03>3 or America/Cayenne starts @@ -867,23 +872,23 @@ input is occasionally extended, and a platform may still be shipping an older zic.

    -

    POSIX properties and limitations

    +

    POSIX.1-2017 properties and limitations

    • - In POSIX, time display in a process is controlled by the + In POSIX.1-2017, time display in a process is controlled by the environment variable TZ. - Unfortunately, the POSIX + Unfortunately, the POSIX.1-2017 TZ string takes a form that is hard to describe and is error-prone in practice. - Also, POSIX TZ strings cannot deal with daylight + Also, POSIX.1-2017 TZ strings cannot deal with daylight saving time rules not based on the Gregorian calendar (as in Morocco), or with situations where more than two time zone abbreviations or UT offsets are used in an area.

      - The POSIX TZ string takes the following form: + The POSIX.1-2017 TZ string takes the following form:

      @@ -950,7 +955,7 @@ an older zic.

      - Here is an example POSIX TZ string for New + Here is an example POSIX.1-2017 TZ string for New Zealand after 2007. It says that standard time (NZST) is 12 hours ahead of UT, and that daylight saving time @@ -961,7 +966,7 @@ an older zic. 

      TZ='NZST-12NZDT,M9.5.0,M4.1.0/3'

      - This POSIX TZ string is hard to remember, and + This POSIX.1-2017 TZ string is hard to remember, and mishandles some timestamps before 2008. With this package you can use this instead:

      @@ -999,7 +1004,7 @@ an older zic. limit phone calls to off-peak hours.
    • - POSIX provides no convenient and efficient way to determine + POSIX.1-2017 provides no convenient and efficient way to determine the UT offset and time zone abbreviation of arbitrary timestamps, particularly for timezones that do not fit into the POSIX model. @@ -1026,14 +1031,14 @@ an older zic.
    -

    Extensions to POSIX in the +

    Extensions to POSIX.1-2017 in the tz code

    • The TZ environment variable is used in generating the name of a file from which time-related information is read - (or is interpreted à la POSIX); TZ is no longer + (or is interpreted à la POSIX.1-2017); TZ is no longer constrained to be a string containing abbreviations and numeric data as described above. The file's format is TZif, diff --git a/contrib/tzdata/version b/contrib/tzdata/version index cd9c3f6d6e5..04fe6744432 100644 --- a/contrib/tzdata/version +++ b/contrib/tzdata/version @@ -1 +1 @@ -2023d +2024a diff --git a/contrib/tzdata/zishrink.awk b/contrib/tzdata/zishrink.awk index 66968e8648e..c98dc6ae786 100644 --- a/contrib/tzdata/zishrink.awk +++ b/contrib/tzdata/zishrink.awk @@ -162,7 +162,7 @@ function make_line(n, field, \ # Process the input line LINE and save it for later output. function process_input_line(line, \ - f, field, end, i, n, r, startdef, \ + f, field, end, n, outline, r, \ linkline, ruleline, zoneline) { # Remove comments, normalize spaces, and append a space to each line. @@ -199,8 +199,10 @@ function process_input_line(line, \ } # Abbreviate "max", "min", "only" and month names. - gsub(/ max /, " ma ", line) - gsub(/ min /, " mi ", line) + # Although "max" and "min" can both be abbreviated to just "m", + # the longer forms "ma" and "mi" are needed with zic 2023d and earlier. + gsub(/ max /, dataform == "vanguard" ? " m " : " ma ", line) + gsub(/ min /, dataform == "vanguard" ? " m " : " mi ", line) gsub(/ only /, " o ", line) gsub(/ Jan /, " Ja ", line) gsub(/ Feb /, " F ", line) @@ -234,66 +236,96 @@ function process_input_line(line, \ rule_used[r] = 1 } - # If this zone supersedes an earlier one, delete the earlier one - # from the saved output lines. - startdef = "" if (zoneline) zonename = startdef = field[2] else if (linkline) zonename = startdef = field[3] else if (ruleline) zonename = "" - if (startdef) { - i = zonedef[startdef] - if (i) { - do - output_line[i - 1] = "" - while (output_line[i++] ~ /^[-+0-9]/); - } - } - zonedef[zonename] = nout + 1 - # Save the line for later output. - output_line[nout++] = make_line(n, field) + # Save the information for later output. + outline = make_line(n, field) + if (ruleline) + rule_output_line[nrule_out++] = outline + else if (linkline) { + # In vanguard format with Gawk, links are output sorted by destination. + if (dataform == "vanguard" && PROCINFO["version"]) + linkdef[zonename] = field[2] + else + link_output_line[nlink_out++] = outline + }else + zonedef[zonename] = (zoneline ? "" : zonedef[zonename] "\n") outline } function omit_unused_rules( \ i, field) { - for (i = 0; i < nout; i++) { - split(output_line[i], field) - if (field[1] == "R" && !rule_used[field[2]]) { - output_line[i] = "" - } + for (i = 0; i < nrule_out; i++) { + split(rule_output_line[i], field) + if (!rule_used[field[2]]) + rule_output_line[i] = "" } } function abbreviate_rule_names( \ - abbr, f, field, i, n, r) + abbr, f, field, i, n, newdef, newline, r, \ + zoneline, zonelines, zonename) { - for (i = 0; i < nout; i++) { - n = split(output_line[i], field) + for (i = 0; i < nrule_out; i++) { + n = split(rule_output_line[i], field) if (n) { - f = field[1] == "Z" ? 4 : field[1] == "L" ? 0 : 2 - r = field[f] + r = field[2] if (r ~ /^[^-+0-9]/) { abbr = rule[r] if (!abbr) { rule[r] = abbr = gen_rule_name(r) } - field[f] = abbr - output_line[i] = make_line(n, field) + field[2] = abbr + rule_output_line[i] = make_line(n, field) } } } + for (zonename in zonedef) { + zonelines = split(zonedef[zonename], zoneline, /\n/) + newdef = "" + for (i = 1; i <= zonelines; i++) { + newline = zoneline[i] + n = split(newline, field) + f = i == 1 ? 4 : 2 + r = rule[field[f]] + if (r) { + field[f] = r + newline = make_line(n, field) + } + newdef = (newdef ? newdef "\n" : "") newline + } + zonedef[zonename] = newdef + } } function output_saved_lines( \ - i) + i, zonename) { - for (i = 0; i < nout; i++) - if (output_line[i]) - print output_line[i] + for (i = 0; i < nrule_out; i++) + if (rule_output_line[i]) + print rule_output_line[i] + + # When using gawk, output zones sorted by name. + # This makes the output a bit more compressible. + PROCINFO["sorted_in"] = "@ind_str_asc" + for (zonename in zonedef) + print zonedef[zonename] + + if (nlink_out) + for (i = 0; i < nlink_out; i++) + print link_output_line[i] + else { + # When using gawk, output links sorted by destination. + # This also helps compressibility a bit. + PROCINFO["sorted_in"] = "@val_type_asc" + for (zonename in linkdef) + printf "L %s %s\n", linkdef[zonename], zonename + } } BEGIN { diff --git a/contrib/tzdata/zonenow.tab b/contrib/tzdata/zonenow.tab index 2dbe8f00d1b..b6f2910956f 100644 --- a/contrib/tzdata/zonenow.tab +++ b/contrib/tzdata/zonenow.tab @@ -199,7 +199,7 @@ XX +2518+05518 Asia/Dubai Russia; Caucasus; Persian Gulf; Seychelles; Réunion XX +3431+06912 Asia/Kabul Afghanistan # # +05 -XX +4120+06918 Asia/Tashkent Russia; Tajikistan; Turkmenistan; Uzbekistan; Maldives +XX +4120+06918 Asia/Tashkent Russia; west Kazakhstan; Tajikistan; Turkmenistan; Uzbekistan; Maldives # # +05 - PKT XX +2452+06703 Asia/Karachi Pakistan ("PKT") @@ -215,6 +215,8 @@ XX +2743+08519 Asia/Kathmandu Nepal # # +06 XX +2343+09025 Asia/Dhaka Russia; Kyrgyzstan; Bhutan; Bangladesh; Chagos +# +06 until 2024-03-01; then +05 +XX +4315+07657 Asia/Almaty Kazakhstan (except western areas) # # +06:30 XX +1647+09610 Asia/Yangon Myanmar; Cocos -- 2.45.0