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Kazakhstan switches to UTC+5
by Pavel Starosek Jan. 19, 2024

Jan. 19, 2024

Hello, Today government agencies announced a change in time zone from UTC+6 to UTC+5 from 00:00 on March 1, 2024. After this Kazakhstan will have a single time zone. https://www.gov.kz/memleket/entities/mti/press/news/details/688998?lang=ru > Amendments have been made to the Government Decree “On the procedure for calculating time on the territory of the Republic of Kazakhstan”. According to the changes, the use of a single time zone throughout the country is established from 00:00 on March 1, 2024. > Thus, the 5th time zone (UTC+5) will be applied to the entire territory of the Republic of Kazakhstan. > Today in Kazakhstan there are two time zones UTC+5 and UTC+6. Most of the country's territory (with the exception of the western regions) is located in the UTC+6 zone. > The resolution is subject to official publication and comes into force on March 1, 2024. -- Thanks, Pavel Starosek

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Canadian Geographic Matthews & Vincent article URI updates
by Brian Inglis Jan. 18, 2024

Jan. 18, 2024

Current tzdata contains northamerica:1413: # From Paul Eggert (2014-10-18): # H. David Matthews and Mary Vincent's map # "It's about TIME", _Canadian Geographic_ (September-October 1998) # http://www.canadiangeographic.ca/Magazine/SO98/alacarte.asp # contains detailed boundaries for regions observing nonstandard # time and daylight saving time arrangements in Canada circa 1998. Could update this with the Archive.org URIs below or possibly move it to tz-art.html section "Books, plays and magazines": H. David Matthews and Mary Vincent, earliest working Archive.org URIs: https://web.archive.org/web/20071217083933/http://www.canadiangeographic.ca… https://web.archive.org/web/19990827055050/https://canadiangeographic.ca/SO… "It's about TIME", "À la Carte" column, Canadian Geographic Magazine, September/October 1998 issue; original CanGeog URIs: http://www.canadiangeographic.ca/Magazine/SO98/alacarte.asp https://canadiangeographic.ca/SO98/geomap.htm Summarizes Canada's time zone rules, boundaries, deviations, and exceptions with maps. In each pair of URIs for Archive.org and CanGeog original, the 1st URI is for article content within that issue's column context, the 2nd URI is the article content alone. -- Take care. Thanks, Brian Inglis Calgary, Alberta, Canada La perfection est atteinte Perfection is achieved non pas lorsqu'il n'y a plus rien à ajouter not when there is no more to add mais lorsqu'il n'y a plus rien à retirer but when there is no more to cut -- Antoine de Saint-Exupéry

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[PROPOSED] Draft next POSIX has tm_gmtoff, tm_zone
by Paul Eggert Jan. 15, 2024

Jan. 15, 2024

* private.h (TM_GMTOFF, TM_ZONE): Treat draft next POSIX like glibc etc., since it requires tm_gmtoff and tm_zone. --- private.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/private.h b/private.h index 07316289..8eff90b7 100644 --- a/private.h +++ b/private.h @@ -768,7 +768,8 @@ time_t posix2time(time_t); /* Infer TM_ZONE on systems where this information is known, but suppress guessing if NO_TM_ZONE is defined. Similarly for TM_GMTOFF. */ -#if (defined __GLIBC__ \ +#if (200809 < _POSIX_VERSION \ + || defined __GLIBC__ \ || defined __tm_zone /* musl */ \ || defined __FreeBSD__ || defined __NetBSD__ || defined __OpenBSD__ \ || (defined __APPLE__ && defined __MACH__)) -- 2.40.1

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[PATCH] Asia/Ho_Chi_Minh 1945-09 Source added
by Đoàn Trần Công Danh Jan. 15, 2024

Jan. 15, 2024

A new source for the transition of Asia/Ho_Chi_Minh and Asia/Hanoi from +09 to +07 was found. The source is Việt Nam Dân Quốc Công Báo (Official Journal of the People Republic of Viet Nam). Original text and translation: Bộ-trưởng bộ Nội-vụ Minister of Ministry of Internal Affairs Chiểu chi nghị-định cựu Toàn-Quyền Đông-Dương ngày 29 tháng 3 năm 1945 ấn định giờ chính thức ở Đông-Dương, Based on the decision of the former Governor-General of the (French) Indochina on the 29th of March, 1945, that dictated the official timezone in Indochina, Nghị-Định Decided Điều thứ nhất: Trong toàn cõi nước Việt-Nam, giờ chính thức do nghị định ngày 29 tháng 3 năm 1945 ấn định, sẽ lui lại hai giờ, kể từ 24 giờ, ngày mồng 1 tháng 9 năm 1945. Article 1: In the whole Viet-Nam, the official timezone as dictated by decision on the 29th of March 1945, would move back 2 hours, effective at 24:00 on the 1st of September 1945 Điều thứ hai: Nghị-định cựu Toàn-Quyền Đông-Dương ngày 29 tháng 3 năm 1945 kể trên từ nay sẽ bãi bỏ. Article 2: The Decision on the 29 of March 1945 of the former Governor-General of the Indochina would be canceled from now on. Hà-nội ngày mồng 1 tháng 9 năm 1945 --- asia | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/asia b/asia index 04526c19..e8317127 100644 --- a/asia +++ b/asia @@ -4058,6 +4058,15 @@ Zone Asia/Tashkent 4:37:11 - LMT 1924 May 2 # which is used below even though the modern-day Phù Liễn Observatory # is closer to 07:06:31. Abbreviate Phù Liễn Mean Time as PLMT. # +# In September 1, 1945, Vietnam moved back 2 hours, back to GMT+7. +# In that very decision, they mentioned an old decision to change timezone +# in March 29, 1945. It's unknown whether Vietnam moved to GMT+9 either on +# or after March 29, 1945; or the decision (by a Japanese Goveror-General) +# only legalised the change to GMT+9 earlier. +# Source: Việt Nam Dân Quốc Công Báo, No. 1, September 29, 1945 +# Archived by National Library of Viet Nam +# http://baochi.nlv.gov.vn/baochi/cgi-bin/baochi?a=d&d=JwvzO19450929.2.5&srpo… +# # The following transitions occurred in Indochina in general (before 1954) # and in South Vietnam in particular (after 1954): # To 07:00 on 1911-05-01. -- 2.43.0.422.g5e73029237

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Extra transition for Europe/London with 2023d
by Derick Rethans Jan. 14, 2024

Jan. 14, 2024

Hi, I have just updated the tzdb for PHP, and one of our tests started failing, and it turned out due to an unexpected data change: Previously, the following transitions existed: … 1994-03-27 01:00:00 UT ( 764730000) = 1 [ 3600 1 4 'BST' (0,0)] 1994-10-23 01:00:00 UT ( 782874000) = 2 [ 0 0 8 'GMT' (0,0)] 1995-03-26 01:00:00 UT ( 796179600) = 1 [ 3600 1 4 'BST' (0,0)] 1995-10-22 01:00:00 UT ( 814323600) = 2 [ 0 0 8 'GMT' (0,0)] 1996-03-31 01:00:00 UT ( 828234000) = 1 [ 3600 1 4 'BST' (0,0)] POSIX string: GMT0BST,M3.5.0/1,M10.5.0 std: 2 [ 0 0 8 'GMT' (0,0)] dst: 1 [ 3600 1 4 'BST' (0,0)] But now, they include an extra one for Jan 1st, 1996, with the March 31st one now not being the last one: … 1994-03-27 01:00:00 UT ( 764730000) = 1 [ 3600 1 4 'BST' (0,0)] 1994-10-23 01:00:00 UT ( 782874000) = 2 [ 0 0 8 'GMT' (0,0)] 1995-03-26 01:00:00 UT ( 796179600) = 1 [ 3600 1 4 'BST' (0,0)] 1995-10-22 01:00:00 UT ( 814323600) = 2 [ 0 0 8 'GMT' (0,0)] 1996-01-01 00:00:00 UT ( 820454400) = 2 [ 0 0 8 'GMT' (0,0)] POSIX string: GMT0BST,M3.5.0/1,M10.5.0 std: 2 [ 0 0 8 'GMT' (0,0)] dst: 1 [ 3600 1 4 'BST' (0,0)] I couldn't find anywhere in tzfile.5 or theory.html whether the last generated transition must match a transition as specified with the POSIX string (as it did with 2023c and earlier), but I vaguely remember having read such a thing when I implemented the POSIX string parsing logic. As far as I know so-far, the only effect it has on PHP users is that they will now see an extra transition when they enumerate them (the 1996-01-01 is inserted). I think I am mostly flagging this up because this was an unexpected change. cheers, Derick -- https://derickrethans.nl | https://xdebug.org | https://dram.io Author of Xdebug. Like it? Consider supporting me: https://xdebug.org/support Host of PHP Internals News: https://phpinternals.news mastodon: @derickr@phpc.social @xdebug@phpc.social twitter: @derickr and @xdebug

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[PROPOSED] "m" now abbreviates both "maximum" and "minimum"
by Paul Eggert Jan. 12, 2024

Jan. 12, 2024

* zishrink.awk: Add comment about "m". --- zishrink.awk | 3 +++ 1 file changed, 3 insertions(+) diff --git a/zishrink.awk b/zishrink.awk index 66968e86..eb4aa785 100644 --- a/zishrink.awk +++ b/zishrink.awk @@ -199,6 +199,9 @@ function process_input_line(line, \ } # Abbreviate "max", "min", "only" and month names. + # Although "max" and "min" can both be abbreviated to just "m", + # use the longer forms "ma" and "mi" for now, + # for compatibility with zic 2023d and earlier. gsub(/ max /, " ma ", line) gsub(/ min /, " mi ", line) gsub(/ only /, " o ", line) -- 2.40.1

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NIST URLs for leap-seconds.list in leapseconds.awk
by PoolMUC＠web.de Jan. 11, 2024

Jan. 11, 2024

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Ontario 1949-1950 DST->STD in Sep not Nov
by Brian Inglis Jan. 11, 2024

Jan. 11, 2024

I noticed changes in the DST->STD transition dates to the follwing week mentioned in an Alexandria, Ontario weekly newspaper article linked from a page on an unrelated issue, and checking that against zdump found that 1949 & 1950 appear to have transitioned in November, rather than September as in other years from 1946-1956, which from comments in northamerica, appear to derive from Shanks & Pottenger. So I also downloaded the same paper's issue from the same week of September in the other questionable year, and found another article announcing the change that weekend. As well as time being the lede in top of front page articles about municipal business, there are also municipal notices of time changes in later pages, as well as Canadian National railway ads announcing updated time tables being available from that weekend, and an article listing updated CNR train times from Montreal, and a mention of a follow up when Montreal time changes the weekend following Ontario cities. The attached files show relevant edited pdftotext extracts from the PDFs. Note that the municipality changed its time a day leter than elsewhere in Ontario, midnight Sunday/Monday rather than Saturday/Sunday, so that people will not miss Sunday church services, but Monday work does not matter! [Canada traditionally calls the prairie provinces the "Bible Belt" and there are visible signs of that, including dry municipalities where alcohol was not available, but that did not stop many bars and shops in nearby towns opening Sundays, if there was enough business to be worth it, whereas many eastern provinces had legal restrictions on stores and bars opening on Sundays until recently.]

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trailing whitespace in IERS leap-seconds.list file
by Paul Eggert Jan. 11, 2024

Jan. 11, 2024

Martin Burnicki writes that the IERS's current leap-seconds.list file has a notice that it's in the public domain. Thanks: this means there's no copyright issue in including a copy of the file in the Time Zone Database (TZDB). While testing that, though, I got the following warning from our version control system: .git/rebase-apply/patch:284: trailing whitespace. # Since the adoption of this system in 1972 it has been necessary to add a number of seconds to UTC, warning: 1 line adds whitespace errors. This warning occurs because line 21 of <https://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list> contains a trailing space character. Could you please remove it? That will lessen aggravation downstream. Thanks.

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[PROPOSED] Miquelon 1911 transition was June 15 not May 15
by Paul Eggert Jan. 11, 2024

Jan. 11, 2024

I found a new source: Société Française de Physique, Recueil de constantes physiques (1913), page 752 (errata and addenda), 18b. It agrees with Shanks about the adoption of standard time in French possessions, except for Miquelon. Prefer it to Shanks. Also, fill in day of month (e.g., “Jan 1” not “Jan”) for other transitions, since the source seems careful about the day. * NEWS: Mention this. * africa (Africa/Ndjamena, Africa/Abidjan): * australasia (Pacific/Gambier, Pacific/Marquesas, Pacific/Tahiti) (Pacific/Guadalcanal): * northamerica (America/Martinique): * southamerica (America/Cayenne): Fill in day of month as 1. This does not change the transitions; it’s merely documentation. * northamerica (America/Miquelon): 1911 transition was Jun 15, not May 15. --- NEWS | 2 ++ africa | 8 ++++++-- australasia | 12 ++++++++---- northamerica | 8 ++++++-- southamerica | 5 ++++- 5 files changed, 26 insertions(+), 9 deletions(-) diff --git a/NEWS b/NEWS index 6dba3dfb..f0ccfa87 100644 --- a/NEWS +++ b/NEWS @@ -11,6 +11,8 @@ Unreleased, experimental changes 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" diff --git a/africa b/africa index 6fae18c0..92d823a0 100644 --- a/africa +++ b/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/australasia b/australasia index dc98c1e2..a9e9eb4a 100644 --- a/australasia +++ b/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). # diff --git a/northamerica b/northamerica index 44fd50bd..0163d17a 100644 --- a/northamerica +++ b/northamerica @@ -1268,6 +1268,10 @@ Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 # <http://cs.ucla.edu/~eggert/The-Waste-of-Daylight-19th.pdf> # [PDF] (1914-03) # +# 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 @@ -3437,7 +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 @@ -3544,7 +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/southamerica b/southamerica index 19c7e456..344e67f3 100644 --- a/southamerica +++ b/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 -- 2.40.1

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