September 2022 - tz - lists.iana.org

(no subject)
by Cool Gab19 05 Sep '24

05 Sep '24

can you add Philippine Daylight Time on your Database I think it was missing from the list of the time zones please reply immediately if solved thanks...

4 7

Buggy %z behaviour in strftime
by Almaz Mingaleev 16 May '23

16 May '23

Attached code prints "+0000 America/Los_Angeles" both with glibc and with linked ToT strftime implementation. On MacOs it prints "-0800 America/Los_Angeles". Is it a known issue?

10 19

Re: [tz] Morocco : Ramdan Time Change 2021
by Paul Eggert 15 Mar '23

15 Mar '23

On 3/19/21 3:15 AM, Semlali Naoufal wrote: > At the moment, we have no official government announcement to this effect. But, logically, the change to the GMT schedule should be made on the night of April 10-11, 2021 (last weekend before Ramadan). Yes, that's been the tzdb prediction too, ever since tzdb version 2018h (2018-12-23). For the record, here are tzdb's current predictions Morocco transitions during the next five years. Sun Apr 11 01:59:59 2021 UT = Sun Apr 11 02:59:59 2021 +01 Sun Apr 11 02:00:00 2021 UT = Sun Apr 11 02:00:00 2021 +00 Sun May 16 01:59:59 2021 UT = Sun May 16 01:59:59 2021 +00 Sun May 16 02:00:00 2021 UT = Sun May 16 03:00:00 2021 +01 Sun Mar 27 01:59:59 2022 UT = Sun Mar 27 02:59:59 2022 +01 Sun Mar 27 02:00:00 2022 UT = Sun Mar 27 02:00:00 2022 +00 Sun May 8 01:59:59 2022 UT = Sun May 8 01:59:59 2022 +00 Sun May 8 02:00:00 2022 UT = Sun May 8 03:00:00 2022 +01 Sun Mar 19 01:59:59 2023 UT = Sun Mar 19 02:59:59 2023 +01 Sun Mar 19 02:00:00 2023 UT = Sun Mar 19 02:00:00 2023 +00 Sun Apr 30 01:59:59 2023 UT = Sun Apr 30 01:59:59 2023 +00 Sun Apr 30 02:00:00 2023 UT = Sun Apr 30 03:00:00 2023 +01 Sun Mar 10 01:59:59 2024 UT = Sun Mar 10 02:59:59 2024 +01 Sun Mar 10 02:00:00 2024 UT = Sun Mar 10 02:00:00 2024 +00 Sun Apr 14 01:59:59 2024 UT = Sun Apr 14 01:59:59 2024 +00 Sun Apr 14 02:00:00 2024 UT = Sun Apr 14 03:00:00 2024 +01 Sun Feb 23 01:59:59 2025 UT = Sun Feb 23 02:59:59 2025 +01 Sun Feb 23 02:00:00 2025 UT = Sun Feb 23 02:00:00 2025 +00 Sun Apr 6 01:59:59 2025 UT = Sun Apr 6 01:59:59 2025 +00 Sun Apr 6 02:00:00 2025 UT = Sun Apr 6 03:00:00 2025 +01 Sun Feb 15 01:59:59 2026 UT = Sun Feb 15 02:59:59 2026 +01 Sun Feb 15 02:00:00 2026 UT = Sun Feb 15 02:00:00 2026 +00 Sun Mar 22 01:59:59 2026 UT = Sun Mar 22 01:59:59 2026 +00 Sun Mar 22 02:00:00 2026 UT = Sun Mar 22 03:00:00 2026 +01 Sun Feb 7 01:59:59 2027 UT = Sun Feb 7 02:59:59 2027 +01 Sun Feb 7 02:00:00 2027 UT = Sun Feb 7 02:00:00 2027 +00 Sun Mar 14 01:59:59 2027 UT = Sun Mar 14 01:59:59 2027 +00 Sun Mar 14 02:00:00 2027 UT = Sun Mar 14 03:00:00 2027 +01 Sun Jan 23 01:59:59 2028 UT = Sun Jan 23 02:59:59 2028 +01 Sun Jan 23 02:00:00 2028 UT = Sun Jan 23 02:00:00 2028 +00 Sun Mar 5 01:59:59 2028 UT = Sun Mar 5 01:59:59 2028 +00 Sun Mar 5 02:00:00 2028 UT = Sun Mar 5 03:00:00 2028 +01 Sun Jan 14 01:59:59 2029 UT = Sun Jan 14 02:59:59 2029 +01 Sun Jan 14 02:00:00 2029 UT = Sun Jan 14 02:00:00 2029 +00 Sun Feb 18 01:59:59 2029 UT = Sun Feb 18 01:59:59 2029 +00 Sun Feb 18 02:00:00 2029 UT = Sun Feb 18 03:00:00 2029 +01 Sun Dec 30 01:59:59 2029 UT = Sun Dec 30 02:59:59 2029 +01 Sun Dec 30 02:00:00 2029 UT = Sun Dec 30 02:00:00 2029 +00 Sun Feb 10 01:59:59 2030 UT = Sun Feb 10 01:59:59 2030 +00 Sun Feb 10 02:00:00 2030 UT = Sun Feb 10 03:00:00 2030 +01 Sun Dec 22 01:59:59 2030 UT = Sun Dec 22 02:59:59 2030 +01 Sun Dec 22 02:00:00 2030 UT = Sun Dec 22 02:00:00 2030 +00

3 9

Paraguay on its way to stay on DST
by Carlos Raúl Perasso 02 Mar '23

02 Mar '23

On September 28, the Paraguayan Chamber of Deputies approved a bill that eliminates winter time in Paraguay. This would make Paraguay stay in DST throughout the year. The project was sent to the Senate for approval. After this, it could still have the presidential veto. If successful, the law would take effect after this weekend's time change, so the new rule should read as follows: Rule Para 2010 2022 - Oct Sun>=1 0:00 1:00 - Rule Para 2013 2022 - Mar Sun>=22 0:00 0 - I will keep you informed of the progress of the bill. Saludos, Carlos

2 2

United States Senate reintroduced Sunshine Protection Act, enabling Permanent DST
by Phake Nick 14 Nov '22

14 Nov '22

I don't quite understand the legal text of the bill itself [2], but according to my reading, it seems like the bill will end DST across the entire US by shifting the standard time forward an hour, except in states/territories/area that currently doesn't enact DST, which they can choose to follow the new standard time or old standard time? 1: https://www.rubio.senate.gov/public/index.cfm/2021/3/rubio-colleagues-reint… 2: https://www.rubio.senate.gov/public/_cache/files/d34c77c0-acea-4074-bc57-14…

18 26

Mexico on track to abolish DST
by Paul Eggert 03 Nov '22

03 Nov '22

Yesterday Mexico's Chamber of Deputies voted 445–33 to abolish DST in most of Mexico, and although there are more hurdles I expect this to become law. When that happens, I hope the following simple patch will suffice; it merely changes "max" to "2022" in the last two Mexico Rule lines. We'll also need to add commentary citing the law, etc., but you can try this patch now if you like, to debug any applications involving future time in Mexico. Today timeanddate updated their English-language summary of this <https://www.timeanddate.com/news/time/mexico-remove-dst-2022.html>. I haven't installed the following. diff --git a/northamerica b/northamerica index da84f354..2466d627 100644 --- a/northamerica +++ b/northamerica @@ -2634,2 +2634,2 @@ Rule Mexico 2001 only - Sep lastSun 2:00 0 S -Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D -Rule Mexico 2002 max - Oct lastSun 2:00 0 S +Rule Mexico 2002 2022 - Apr Sun>=1 2:00 1:00 D +Rule Mexico 2002 2022 - Oct lastSun 2:00 0 S

4 16

Re: [tz] iana build failures on Windows
by Paul Eggert 02 Nov '22

02 Nov '22

On 4/19/21 7:09 AM, Manuela Friedrich wrote: > I had to include signal.h in zic.c to prevent the following error: > > zic.c(610): error C2061: syntax error: identifier 'got_signal' This is a portability bug recently introduced to zic.c. I installed the first attached patch to fix it. > The I needed to resolved error > > zic.obj : error LNK2019: unresolved external symbol tz_time referenced in function random_dirent This appears to be another recent portability bug. It's related to a portability problem you reported on MS-Windows in response to which in 2018d I committed a patch that introduced RESERVE_STD_EXT_IDS: https://github.com/eggert/tz/commit/24b45243c5210b4196987fdd06e6c288c358a268 When I recently added the randomish filename code to the development version, I neglected to deal with RESERVE_STD_EXT_IDS. The second attached patch should fix this issue. Please give the two patches a try, as I don't use MS-Windows and can't easily test these patches on that platform. > a test run of zdump -v produced way more output than in the last release, the Linux output seems to have become longer too, but maybe this is still under development. That change is intentional, and was caused by this: https://github.com/eggert/tz/commit/ac07b446a3afaa4cb1ae11a91785a201c91f6351 along with some neighboring commits. Thanks for reporting the problems, and I hope the current development version of tzdb addresses the issues you mentioned.

5 23

[PATCH 0/5] Simplifying Link line maintenance
by Paul Eggert 17 Oct '22

17 Oct '22

Although TZDB currently puts most Link lines in the ‘backward’ file, some Link lines reside in the continental files ‘africa’, ‘antarctica’, etc., with little rhyme or reason as to which lines are in ‘backward’ and which line are in a continental file. This is confusing and makes maintenance a bit more difficult. This proposed series of patches aims to regularize this by putting the Link lines into ‘backward’, except that to work around a TZUpdater bug the GMT Link line is in ‘backward’ only when using vanguard form. As part of these patches, the Link lines in ‘backward’ are organized into sections that better explain the reason for each Link line. Also, comments are added to document shortcut Link lines, that is, Link lines reworded to reference the target rather than the source of another Link line. Furthermore, the Makefile is augmented to check Link lines more carefully. The overall effect of this patch is to shrink TZDB’s source code and make maintenance simpler and more robust, without affecting data except for users who are purposely bleeding-edge by omitting all backward-compatibility links. Because these patches are nontrivial I have not installed them in the development repository, and there is no rush. Comments welcome as usual. Paul Eggert (5): Move a few links to ‘backward’ Move most remaining links to ‘backward’ Reorder 'backward’ Improve checking for shortcut links Coalesce some commentary Makefile | 6 +- NEWS | 17 +++ africa | 213 ++++++++++-------------------------- antarctica | 2 +- asia | 69 ++++-------- australasia | 46 +++----- backward | 288 +++++++++++++++++++++++++++++++++++++++---------- checklinks.awk | 17 +++ etcetera | 17 ++- europe | 202 ++++++++++++---------------------- northamerica | 86 ++++----------- southamerica | 15 --- theory.html | 1 + zdump.c | 4 +- ziguard.awk | 14 +++ 15 files changed, 472 insertions(+), 525 deletions(-) -- 2.37.3

2 8

[PROPOSED] Treat 1931 changes in Mexico as DST
by Paul Eggert 30 Sep '22

30 Sep '22

Mexico’s Chamber of Deputies was supposed to vote today on legislation abolishing DST in most of Mexico. Although the vote was delayed due to Internet problems, news coverage of the non-event led me to review our sources for DST in Mexico, and I found that tzdb considered the transitions in 1931 to be two changes to standard time, whereas it is considered to be DST in today’s news coverage, as well as in our main source, the history of Mexican local time published by the Investigation and Analysis Service of the Mexican Library of Congress. Fix this by considering the 1931 changes to be DST, not standard time. * NEWS: Mention this. * northamerica (Mexico): Add DST rules for 1931. (America/Mexico_City, America/Ojinaga, America/Chihuahua) (America/Hermosillo, America/Mazatlan, America/Bahia_Banderas): Use them. --- NEWS | 9 +++++++++ northamerica | 26 ++++++++------------------ 2 files changed, 17 insertions(+), 18 deletions(-) diff --git a/NEWS b/NEWS index 64327d0..bcdad41 100644 --- a/NEWS +++ b/NEWS @@ -1,5 +1,14 @@ News for the tz database +Unreleased, experimental changes + + Changes to past time zone abbreviations and DST flags + + The temporary advancement of clocks in central Mexico in summer + 1931 is now treated as daylight saving time, instead of as two + changes to standard time. + + Release 2022d - 2022-09-23 12:02:57 -0700 Briefly: diff --git a/northamerica b/northamerica index 13fb064..f848228 100644 --- a/northamerica +++ b/northamerica @@ -2617,6 +2617,8 @@ Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 # longitude they are located at. # Rule NAME FROM TO - IN ON AT SAVE LETTER/S +Rule Mexico 1931 only - May 1 23:00 1:00 D +Rule Mexico 1931 only - Oct 1 0:00 0 S Rule Mexico 1939 only - Feb 5 0:00 1:00 D Rule Mexico 1939 only - Jun 25 0:00 0 S Rule Mexico 1940 only - Dec 9 0:00 1:00 D @@ -2667,9 +2669,7 @@ Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44 Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 -7:00 - MST 1927 Jun 10 23:00 -6:00 - CST 1930 Nov 15 - -7:00 - MST 1931 May 1 23:00 - -6:00 - CST 1931 Oct - -7:00 - MST 1932 Apr 1 + -7:00 Mexico M%sT 1932 Apr 1 -6:00 Mexico C%sT 2001 Sep 30 2:00 -6:00 - CST 2002 Feb 20 -6:00 Mexico C%sT @@ -2680,9 +2680,7 @@ Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 Zone America/Ojinaga -6:57:40 - LMT 1922 Jan 1 0:02:20 -7:00 - MST 1927 Jun 10 23:00 -6:00 - CST 1930 Nov 15 - -7:00 - MST 1931 May 1 23:00 - -6:00 - CST 1931 Oct - -7:00 - MST 1932 Apr 1 + -7:00 Mexico M%sT 1932 Apr 1 -6:00 - CST 1996 -6:00 Mexico C%sT 1998 -6:00 - CST 1998 Apr Sun>=1 3:00 @@ -2692,9 +2690,7 @@ Zone America/Ojinaga -6:57:40 - LMT 1922 Jan 1 0:02:20 Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40 -7:00 - MST 1927 Jun 10 23:00 -6:00 - CST 1930 Nov 15 - -7:00 - MST 1931 May 1 23:00 - -6:00 - CST 1931 Oct - -7:00 - MST 1932 Apr 1 + -7:00 Mexico M%sT 1932 Apr 1 -6:00 - CST 1996 -6:00 Mexico C%sT 1998 -6:00 - CST 1998 Apr Sun>=1 3:00 @@ -2703,9 +2699,7 @@ Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40 Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08 -7:00 - MST 1927 Jun 10 23:00 -6:00 - CST 1930 Nov 15 - -7:00 - MST 1931 May 1 23:00 - -6:00 - CST 1931 Oct - -7:00 - MST 1932 Apr 1 + -7:00 Mexico M%sT 1932 Apr 1 -6:00 - CST 1942 Apr 24 -7:00 - MST 1949 Jan 14 -8:00 - PST 1970 @@ -2743,9 +2737,7 @@ Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08 Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 -7:00 - MST 1927 Jun 10 23:00 -6:00 - CST 1930 Nov 15 - -7:00 - MST 1931 May 1 23:00 - -6:00 - CST 1931 Oct - -7:00 - MST 1932 Apr 1 + -7:00 Mexico M%sT 1932 Apr 1 -6:00 - CST 1942 Apr 24 -7:00 - MST 1949 Jan 14 -8:00 - PST 1970 @@ -2755,9 +2747,7 @@ Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 Zone America/Bahia_Banderas -7:01:00 - LMT 1921 Dec 31 23:59:00 -7:00 - MST 1927 Jun 10 23:00 -6:00 - CST 1930 Nov 15 - -7:00 - MST 1931 May 1 23:00 - -6:00 - CST 1931 Oct - -7:00 - MST 1932 Apr 1 + -7:00 Mexico M%sT 1932 Apr 1 -6:00 - CST 1942 Apr 24 -7:00 - MST 1949 Jan 14 -8:00 - PST 1970 -- 2.37.3

2 2

Moving more zones to 'backzone'
by Paul Eggert 29 Sep '22

29 Sep '22

Release 2021b moved to 'backzone' nine zones whose timestamps since 1970 were duplicates of other zones, as part of a process that started in 2013 in the interests of removing prior inequities, one step at a time. If we were to continue this process in the same way, we could install the attached proposed patch which would move more zones, chosen via the same procedure used for 2021b. It strikes me, though, now that Stephen Colebourne has established a mechanism that can let downstream users keep the duplicate-since-1970 zones, that it may be a more effective use of our time to move the rest of the duplicate-si ce-1970 zones now, while no urgent changes are pending. This would move another twelve zones if I've counted correctly, and would let us more efficiently turn our attention to other issues. Comments welcome.

18 50