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KDS Calendar and projection-based time systems — question for TZ coordinators
by Dragan Škondrić May 27, 2026

May 27, 2026

Dear TZ Coordinators and list members, My name is Dragan Škondrić. I am an independent researcher and the author of *KDS Calendar Version 3.0*, a canon-first calendar-time specification. I am writing with a conceptual and architectural question, not with a request to change the IANA Time Zone Database. The core idea of KDS is that existing civil, legal, metrological, and software time systems — including UTC, Gregorian dates, local time zones, DST rules, ISO 8601 renderings, and TZDB-based local-time projections — may remain as projection-facing systems, while a separate canonical layer preserves invariant event identity. In short: *KDS proposes a canonical event-identity layer above projection-based time systems.* Under this framing, time zones and civil-time rules are not treated as errors or obsolete mechanisms. They remain essential projection systems for human, legal, and operational use. However, they are not treated as the primary identity of a preserved event. The event would instead carry a canonical identity, edition information, annual phase, canonical coordinates, source metadata, and projection profile information, so that different projections can be generated without collapsing the event identity into any one local-time rendering. I am aware that TZDB already solves a very different and highly practical problem: maintaining historical and current civil-time rule data for real-world locations. KDS is not proposed as a replacement for that work. My question is narrower: Does the distinction between *canonical event identity* and *civil/time-zone projection* seem technically meaningful from the perspective of people who maintain or use TZDB? A related question is whether there are existing terms, prior discussions, or known models in the time-zone / civil-time community that already address this separation between: 1. the identity of an event, 2. the instant or time scale used for ordering, 3. the local civil-time rendering, 4. and the future replay of that event under changing time-zone or calendar rules. The specification is archived on Zenodo: *KDS Calendar - Version 3.0* DOI: *10.5281/zenodo.20067725* At this stage I am not asking for endorsement, adoption, or any change to TZDB. I would simply appreciate any technical comments on whether this framing is meaningful, already covered by existing practice, or conceptually misplaced from the viewpoint of the TZDB community. Kind regards, *Dragan Škondrić*

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Missing record Madeira Island DST
by Stefanie Schlosser May 26, 2026

May 26, 2026

Dear IANA team, For personal reasons, I've been trying to find out about DST on Madeira Island, Portugal during the past century. Long story short. I've researched a lot and along the way I've been told that even IANA is actually missing some records for when Madeira Island was congruent in its time changes with mainland Portugal (Lisbon) and when it did its own thing. I've eventually found the original law text for Madeira Island from 1982 and am hereby submitting it to you. You don't have any mistake in your tzdb, but seemingly part of it is based on the assumption that Madeira did not apply DST under certain years, and you didn't have prove of it. Here comes the prove. :) With best regards, Stefanie Schlosser

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US permanent DST to make its way into transportation funding bill
by Tim Parenti May 22, 2026

May 22, 2026

Many on this list will remember the *Sunshine Protection Act of 2021* passing the US Senate in March 2022 by unanimous consent in uncharacteristically swift fashion: https://lists.iana.org/hyperkitty/list/tz@iana.org/thread/GRBDSXXXWM4XXNERF… Following near-immediate blowback from a few senators — including Senator Tom Cotton of Arkansas, who says his staff had not properly flagged it for his opposition — the effort ultimately stalled in the House. When sponsors of functionally identical legislation in the current Congress similarly attempted to fast-track it in October 2025, Cotton blocked the effort. https://thehill.com/homenews/nexstar_media_wire/5581335-effort-to-fast-trac… *The Hill* now reports this week that the legislation is receiving a full markup by the House Energy and Commerce Committee, and will be rolled into the *Motor Vehicle Modernization Act*, a larger transportation funding package. https://thehill.com/homenews/house/5886117-daylight-saving-time-house-repub… https://thehill.com/policy/5889199-permanent-daylight-saving-time-legislati… https://thehill.com/homenews/administration/5890568-trump-praises-daylight-… President Donald Trump, who last year admitted to press that DST reform is a "50/50 issue" which "it's hard to get excited about", praised the committee's vote on Thursday, calling it "a very nice win for the Republican Party" and saying he is "going to work very hard" to see the act signed into law. https://truthsocial.com/@realDonaldTrump/posts/116615022975327653 If adopted as-is, states that do not join Arizona and Hawaii in opting for the existing "standard time" exemption prior to the new law taking effect would automatically be placed into "permanent daylight time". The text does not currently carry any delay provision, nor does it allow for states to opt in or out of DST after it is adopted. https://www.congress.gov/bill/119th-congress/house-bill/139/text https://www.congress.gov/bill/119th-congress/house-bill/7389/text -- Tim Parenti

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Manitoba DST survey underway
by Tim Parenti May 22, 2026

May 22, 2026

Following on from Manitoba Premier Wab Kinew's recent statements to press that "the days of Manitoba switching the clocks twice a year are pretty much at the end"… https://lists.iana.org/hyperkitty/list/tz@iana.org/thread/MLTAPD5WO23WH5MFB… CBC and Global report on social media posts from the premier's office this week, encouraging Manitobans to take a survey on the future of semi-annual time changes: https://www.cbc.ca/news/canada/manitoba/time-change-survey-9.7205662 https://globalnews.ca/news/11856999/manitoba-survey-daylight-savings/ "[The survey] asks specifically which option residents would like to see. Choices include permanent daylight time, permanent standard time, sticking to the status quo and keeping time changes and a final option for no preference." A government spokesperson has said the survey will run through 31 August 2026, so we will probably not see legislative action until the Assembly's fall sitting which is scheduled from 29 September to 3 December 2026. It seems, then, that clocks in Manitoba will likely fall back to UTC−6 on 1 November 2026 as scheduled and either (a) stay there, adopting a "permanent standard time"/"Prairie time zone", (b) spring forward a final time to UTC−5 on 14 March 2027, or (c) maintain the *status quo*. Whichever the outcome, scheduled offsets are not likely to be affected until sometime in 2027. The survey is available in both English and French here: https://engagemb.ca/time-change https://participationmb.ca/changement-d-heure -- Tim Parenti

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[PATCH] Let build environment override _, N_
by Paul Eggert May 19, 2026

May 19, 2026

This is helpful when building this code inside glibc. Problem reported by Adhemerval Zanella Netto in: https://sourceware.org/pipermail/libc-alpha/2026-May/177497.html * private.h (_, N_): Don’t define if already defined. --- private.h | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/private.h b/private.h index ee191b4e..1e6db08c 100644 --- a/private.h +++ b/private.h @@ -1071,12 +1071,16 @@ time_t timeoff(struct tm *, long); ** The default is to use gettext if available, and use MSGID otherwise. */ -#if HAVE_GETTEXT -# define _(msgid) gettext(msgid) -#else /* !HAVE_GETTEXT */ -# define _(msgid) (msgid) -#endif /* !HAVE_GETTEXT */ -#define N_(msgid) (msgid) +#ifndef _ +# if HAVE_GETTEXT +# define _(msgid) gettext(msgid) +# else +# define _(msgid) (msgid) +# endif +#endif +#ifndef N_ +# define N_(msgid) (msgid) +#endif #if !defined TZ_DOMAIN && defined HAVE_GETTEXT # define TZ_DOMAIN "tz" -- 2.53.0

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Alberta to follow British Columbia?
by Roozbeh Pournader May 15, 2026

May 15, 2026

I just ran into this: https://calgaryherald.com/opinion/columnists/bell-alberta-daylight-time-yea…

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BC considering “PacT” to abbreviate Pacific Time
by Paul Eggert May 14, 2026

May 14, 2026

The BC government is considering recommending the abbreviation “PacT” for Pacific Time as observed in British Columbia since 2026-03-09. Two draft TZDB patches are attached that would implement this. The first simply changes “MST” to “PacT” for timestamps starting 2026-11-01, in line with 2026b’s temporary hack to delay this transition because the downstream user CLDR v48.2 (2026-03-17) cannot support BC’s current timekeeping. The second patch removes the temporary hack, adjusting TZDB to better reflect BC’s timekeeping, in the hope that the temporary hack is no longer needed once the abbreviation changes from “MST” to “PacT”. I have not installed these patches into the TZDB development repository, as “PacT” is still under consideration. Comments are welcome as usual.

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Re: research on TZ list
by Michelle Bastian May 13, 2026

May 13, 2026

Dear all, I'm following up from a 2021 post where I let the list know about an academic research project I was planning which involved an analysis of the list discussion. I have now had a chance to finally start on this. I said at the time that I would get back in touch to ask permissions from anyone I would like to quote directly in my write up. Since the tz discussion list is searchable, this would mean that I could not fully anonymise those I quote as is the usual default practice in my field. This email to the full list is just to update everyone on the project, and let people know that I will contact some posters individually through the email they shared with this list. There is no pressure at all to agree, in fact you can ask me to remove any of your comments entirely. If I don't hear back after my first email I will send one follow up, but after that I will assume that you would rather not be involved. If you are happy to be included, I will share an information sheet that explains in detail what I'm asking for, and what to consider when making a decision, as well as consent form. Thanks all! Earlier post: https://lists.iana.org/hyperkitty/list/tz@iana.org/message/OTOYYCADZ7P5BUQX… With best wishes, Michelle. --- Dr Michelle Bastian Senior Lecturer in Environmental Humanities ESALA, Edinburgh College of Art, University of Edinburgh Level 1, Room 303B, The Maltings | Minto House, 20-22 Chambers Street, Edinburgh, EH1 1JZ | 0131 651 5779 https://www.eca.ed.ac.uk/profile/dr-michelle-bastian The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336. Is e buidheann carthannais a th' ann an Oilthigh Dh?n ?ideann, cl?raichte an Alba, ?ireamh cl?raidh SC005336.

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[PROPOSED] Adjust to GCC 16’s warnings
by Paul Eggert May 9, 2026

May 9, 2026

* Makefile (GCC_DEBUG_FLAGS): Add -Wfree-labels, -Wkeyword-macro. --- Makefile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/Makefile b/Makefile index c0dde5be..3428e8fd 100644 --- a/Makefile +++ b/Makefile @@ -377,7 +377,8 @@ GCC_DEBUG_FLAGS = -DGCC_LINT -g3 -O3 \ -Wdeclaration-after-statement -Wdouble-promotion \ -Wduplicated-branches -Wduplicated-cond -Wflex-array-member-not-at-end \ -Wformat=2 -Wformat-overflow=2 -Wformat-signedness -Wformat-truncation \ - -Wimplicit-fallthrough=5 -Winit-self -Wlogical-op \ + -Wfree-labels -Wimplicit-fallthrough=5 -Winit-self \ + -Wkeyword-macro -Wlogical-op \ -Wmissing-declarations -Wmissing-prototypes \ -Wmissing-variable-declarations -Wnested-externs \ -Wnull-dereference \ -- 2.54.0

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[PROPOSED] Update commentary for Winnipeg in 1916 and 1960s
by Paul Eggert May 8, 2026

May 8, 2026

* northamerica: Update commentary in the light of Christian Cassidy’s article published two days ago. Although it seems that our data for America/Winnipeg in the 1960s are incorrect, as yet we have no better sources than Shanks & Pottenger. --- northamerica | 21 ++++++++++++++++----- 1 file changed, 16 insertions(+), 5 deletions(-) diff --git a/northamerica b/northamerica index 3e8641e1..6198e72e 100644 --- a/northamerica +++ b/northamerica @@ -1742,6 +1742,22 @@ Zone America/Toronto -5:17:32 - LMT 1895 # Manitoba +# From Paul Eggert (2026-05-08): +# For 1916 timestamps America/Winnipeg covers only a small region. See: +# Cassidy C. Winnipeg's 100-year history with daylight time. +# Winnipeg Free Press. 2026-05-06. +# https://www.winnipegfreepress.com/our-communities/correspondents/2026/05/06… +# Of the 1916 experiment, Cassidy writes: "As rural areas and nearby +# urban centres such as Selkirk and Brandon did not adopt DST, the +# City of Winnipeg essentially had its own time zone." Cassidy also +# writes that province-wide DST came into effect on 1963-05-12. +# +# Shanks & Pottenger write that Winnipeg did not observe DST in 1964 and 1965. +# Although dubious in the light of Cassidy's article, we lack a better source. +# Perhaps S&P's data are for the train stations, not for the city? +# Also, S&P say Manitoba switched at 02:00 (not 02:00s) starting in 1966. +# Since 02:00s is clearly correct for 1967 on, assume 02:00s in 1966 too. + # From Rob Douglas (2006-04-06): # the old Manitoba Time Act - as amended by Bill 2, assented to # March 27, 1987 ... said ... @@ -1756,11 +1772,6 @@ Zone America/Toronto -5:17:32 - LMT 1895 # the 1987 version would apply - the changeover was at 2:00 Central # Standard Time (i.e. not until 3:00 Central Daylight Time). -# From Paul Eggert (2006-04-10): -# Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s) -# starting 1966. Since 02:00s is clearly correct for 1967 on, assume -# it was also 02:00s in 1966. - # Rule NAME FROM TO - IN ON AT SAVE LETTER/S Rule Winn 1916 only - Apr 23 0:00 1:00 D Rule Winn 1916 only - Sep 17 0:00 0 S -- 2.51.0

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Greenland to abolish DST starting in 2028
by Paul Eggert May 7, 2026

May 7, 2026

The Copenhagen Post reported today[1] that the Naalakkersuisut Government of Greenland supports abolishing daylight saving time, effective January 1, 2028, so that most of Greenland will remain on UTC-2 indefinitely after that. The premier Jens-Frederik Nelson confirmed the intention to issue a new decree to that effect. Although I don't know the details, my impression is that this will affect America/Nuuk and America/Scoresbysund but not America/Thule (which uses US rules, not EU) and America/Danmarkshavn (which does not observe DST). The practical date for this change is 2028-03-26, which is when Greenland would otherwise spring forward, so we have plenty of time to wait for the details in the official decree and install a change to TZDB well before the practical date. [1]: Greenland to abolish daylight saving time from 2028. Copenhagen Post. 2026-05-06. <https://cphpost.dk/2026-05-06/news/round-up/greenland-to-abolish-daylight-s…>

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Elsewhere in Canada
by Tim Parenti May 6, 2026

May 6, 2026

Manitoba Premier Wab Kinew says he thinks "the days of Manitoba switching the clocks twice a year are pretty much at the end," though there appears to be some internal wrangling over which way the clocks should move for the final time. "If we move to permanent standard time, you could have a Prairie time zone" shared between Manitoba, Saskatchewan, and Alberta. https://www.cbc.ca/news/canada/manitoba/time-change-kinew-9.7176389 Manitoba's Legislative Assembly is in session through 1 June before its summer recess, though a decision to adopt such a "Prairie time zone" on year-round UTC−6 likely wouldn't affect wall-clock times until 14 March 2027. So any legislation, if forthcoming, may not happen until the fall. Meanwhile, in Atlantic Canada, "Nova Scotia Premier Tim Houston said he is open to the idea but only if neighbouring provinces did too," while New Brunswick Premier Susan Holt says "we would want to do it in concert with our Atlantic peers. But this is premature." https://www.msn.com/en-ca/news/canada/as-alberta-moves-to-end-time-changes-… https://www.pressreader.com/canada/telegraph-journal/20260429/2815565924285… -- Tim Parenti

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America/Cranbrook
by Chris Walton May 6, 2026

May 6, 2026

Heads up: The *Regional District of East Kootenay* is planning to move to year-round Mountain Standard Time (MST) on November 1, 2026. The district will seek approval from the province (British Columbia). I am skepitcal that they really need provincial approval, but I guess there is no harm in seeking it. In practical terms the district would move from MDT to MST on November 1 as per usual. After that, the clocks would stay fixed on MST. Currently most of East Kootenay uses the *America/Edmonton* TZ ID. There is a very small area in the southwest corner that uses *America/Creston*. If the change is approved, we would need a new TZ ID... probably something like "*America/Cranbrook"*. https://www.rdek.bc.ca/news/entry/rdek_board_moves_to_transition_to_year_ro… Columbia-Shuswap Regional District lies to the north of East Kootenay Regional District. Some areas of Columbia-Shuswap are already on year-round MST and some areas (including the town of Golden) use MST/MDT. I would not be surprised if all of Columbia-Shuswap eventually adopts year-round MST. If that happens, the entire province of BC would be aligned on year-round MST. -chris

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[PROPOSED] Check for NEWS typos similar to 2026b’s
by Paul Eggert April 23, 2026

April 23, 2026

* Makefile (check_mild): Depend on new check. (news.ck): New check. * NEWS: Reword to pass check. --- Makefile | 8 +++++++- NEWS | 2 +- 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/Makefile b/Makefile index 1e0a5903..c0dde5be 100644 --- a/Makefile +++ b/Makefile @@ -913,7 +913,7 @@ tzselect: tzselect.ksh version check: check_mild back.ck now.ck check_mild: check_web check_zishrink \ character-set.ck white-space.ck links.ck mainguard.ck \ - name-lengths.ck slashed-abbrs.ck sorted.ck \ + name-lengths.ck news.ck slashed-abbrs.ck sorted.ck \ tables.ck ziguard.ck tzs.ck # True if UTF8_LOCALE does not work; @@ -1083,6 +1083,12 @@ zishrink-posix.ck zishrink-right.ck: \ rm -fr $@d t-$@d shrunk-$@d touch $@ +# Check that NEWS has data release versions and dates in reverse order. +news.ck: NEWS + grep '^Release [0-9][0-9][0-9][0-9]' NEWS | LC_ALL=C sort -cru + sed -n '/ -0000$$/!s/^Release [^ ]*//p' NEWS|LC_ALL=C sort -cru + touch $@ + clean_misc: rm -fr *.ckd *.dir rm -f *.ck *.core *.o *.out *.t core core.* \ diff --git a/NEWS b/NEWS index ea52e67e..fb1ced71 100644 --- a/NEWS +++ b/NEWS @@ -6666,7 +6666,7 @@ few (e.g., code2012c-data2012d) have tarballs with mixed version numbers. Recent releases also come in an experimental format consisting of a single tarball tzdb-R.tar.lz with extra data. -Release timestamps are taken from the release's commit (for newer, +A release's timestamp is taken from the release's commit (for newer, Git-based releases), from the newest file in the tarball (for older releases, where this info is available) or from the email announcing the release (if all else fails; these are marked with a time zone -- 2.51.0

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[tz-announce] 2026b release of tz code and data available
by Paul Eggert via tz-announce April 23, 2026

April 23, 2026

The 2026b release of the tz code and data is available. As Tim mentioned yesterday[1], this release’s main impetus is British Columbia’s decision to stop changing its clocks and stay on permanent UTC-07, which affects BC’s UTC offsets starting 2026-11-01 at 02:00. Since this change will likely cause problems downstream as CLDR’s latest release cannot handle it, we’re pushing out this release now so that downstream has some time to test and reprogram. Quite possibly we’ll need another release soon to accommodate proposed changes in Alberta and Northwest Territories. [1]: https://lists.iana.org/hyperkitty/list/tz@iana.org/thread/LZIJFAY2K4OXXCAGF… There is an embarrassing typo in the 2026b release: its NEWS file's third line has the wrong release number. I applied the following patch to the development version on GitHub and this patch should appear in the 2026c release. diff --git a/NEWS b/NEWS index a0042701..ea52e67e 100644 --- a/NEWS +++ b/NEWS @@ -3 +3 @@ News for the tz database -Release 2026a - 2026-04-22 23:06:43 -0700 +Release 2026b - 2026-04-22 23:06:43 -0700 The 2026b release contains the following changes: Briefly: British Columbia moved to permanent -07 on 2026-03-09. Some more overflow bugs have been fixed in zic. Changes to future timestamps British Columbia’s 2026-03-08 spring forward was its last foreseeable clock change, as it moved to permanent -07 thereafter. (Thanks to Arthur David Olson.) Although the change to permanent -07 legally took place on 2026-03-09, temporarily model the change to occur on 2026-11-01 at 02:00 instead. This works around a limitation in CLDR v48.2 (2026-03-17). This temporary hack is planned to be removed after CLDR is fixed. Changes to code zic no longer mishandles a last transition to a new time type. zic no longer overflows a buffer when generating a TZ string like "PST-167:59:58PDT-167:59:59,M11.5.6/-167:59:59,M12.5.6/-167:59:59", which can occur with adversarial input. (Thanks to Naveed Khan.) zic no longer generates a longer TZif file than necessary when an earlier time zone abbreviation is a suffix of a later one. As a nice side effect, zic no longer overflows a buffer when given a long series of abbreviations, each a suffix of the next. (Buffer overflow reported by Arthur Chan.) zic no longer overflows an int when processing input like ‘Zone Ouch 2147483648:00:00 - LMT’. The int overflow can lead to buffer overflow in adversarial cases. (Thanks to Naveed Khan.) zic now checks for signals more often. Here are links to the release files: https://www.iana.org/time-zones/repository/releases/tzcode2026b.tar.gz https://www.iana.org/time-zones/repository/releases/tzdata2026b.tar.gz https://www.iana.org/time-zones/repository/releases/tzdb-2026b.tar.lz The following convenience links are also available, although they may point to the previous release until the relevant caches are refreshed: https://www.iana.org/time-zones/repository/tzcode-latest.tar.gz https://www.iana.org/time-zones/repository/tzdata-latest.tar.gz https://www.iana.org/time-zones/repository/tzdb-latest.tar.lz Links are also available via plain HTTP, and via FTP from ftp://ftp.iana.org/tz/releases with the same basenames as above. Each release file has a GPG signature, which can be retrieved by appending ".asc" to the above URLs. Copies of these signatures are appended to this message. This release corresponds to commit 48c25a1ba86cb602990c0573aba7795417931bb4 dated 2026-04-22 23:06:43 -0700 and tagged '2026b' in the development GitHub repository at <https://github.com/eggert/tz>. Here are the SHA-512 checksums for the release files: 55b44d52a83c9db151be32c3d78376ea7f9d4311ef15ed6fe34b855b08fc546531e51309d178d9c175a6d5d7d0b058440e45a55d200ca8925e3798dac9bc739f tzcode2026b.tar.gz a44882258c0a7fbe587e8b73d6bb3cd5be7d4788976ea742adbbf176eb3b33e5bd7d1714b2fffe2972b1a42e7335eac39ed0bd63e819bb421550f8cae1df4f2f tzdata2026b.tar.gz 5ec7f74f14cd2c70a0730e3690e82bd0ba889ac26c96397c16aa08005473c2c86feb47958b52e0301810c8eb908e6d8faf998ffae75b2337a912cc9e52c0f9e9 tzdb-2026b.tar.lz Here are GPG digital signatures for the release files: -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEfjeSqdis99YzvBWI7ZfpDmKqfjQFAmnpt34ACgkQ7ZfpDmKq fjSZew//brt18HiMD/tgxJ1CdjvvzDIZ4P0xWsVuxG4MjkC4821zYCfhDYLZ9Zdb /8wCi63uecmK2JsGjxzz+raX4ppHhZpg31a70KlyU9MarISVB2ldPqYDn+Xc98lR XIKj1ahtzyJoNu/67ZbCT7Ih/Wp8hwdlEFivjq00lnt+M2XCeINq9Cy3guisx3/8 dCziZEqoJFXDsdWmCvKZ93U/o7Xq8x7d9nfRjeBlX8VZMXuSnY3WkhLBRl+2Zgml ECeohhLMBuR6dFNOW6qwlsZGXfDb/Nq1NPsxIKqJ5Lv1K8Sj0h4icsGDMRrLvlZM qfNpsjWZQcH9JErR5hfB/Y6INRsKomRamul9LdlEAauMwO287eR8r5LrADMiAvPR jBVqmceAmgS+34BpRmMUfLwQJmEELbK8xzcdW8e41jrQQ8SuyqXQeYBjgjm3v7gc sA1HyWwDRn6276DQATonELOzREctHLIp2jfRGLAwngAl2CzqkhLZgBEHvdZbqW/s RbZLOk0u/y3Trd+dyFcLq/gxNSZQYQqpDmRiYNkb0vl02lu3lbZ1o3dmdF/AZ70U evj6z5iXztdKCQb9ZkecjNXncPDQNPoO1bJqm1QNYvUToMDNnJdu12qva+skNUyt HE54zxjcKv78bhm2ufXcqt4Ju/onyACTkSDQeCEzIzdBu9abVgw= =7394 -----END PGP SIGNATURE----- -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEfjeSqdis99YzvBWI7ZfpDmKqfjQFAmnpt34ACgkQ7ZfpDmKq fjTFTxAAisuje9O4OTkSUUQ4nHuZOHQW/1FNGXmIb/bGnAGAwOrGqiLuyQ0kJYxk Gdp4cTXEu5+NyQXeBPFtjBNbZO2cMC80rvl9/h3qUlbYG+ydhY0bjDglV3BEP/U/ OrP4pQsNjHeSl+p+3VSq7fAtOGcCRkBQrbEy5yXN5HzYJyCH4GAE1HZNNYKbCzAm hIxspmu6zjeN4xeLsXrB7DfiP7BJydrxk1LShU4zwmwJdmkH8dCGnDW4Kipz+tWF 2W8P4braXTAWCswLhOC8xYZLJKxf1nWS3dyo3i1IfnRciGD0O9dyLsJmlHxS4/34 Ometm9XahPHPiWvjBoqubKEfp6B+AlmmP9D1jM0BY7seuz2oxFUE7YW5+4cO4VhJ soWTDCKjyzo+wgflw3brv7j5AFP7tA7To6fbQ0W0oAmSRFQ10MA3JB0GSgn45SST 49C9jQ7U0XcroeIuoWs/1MbAz+qgCLk9QdijxNWsvk5S5h88FKLckVkEUUNgUSL/ F3z4h2Af6KpWq/n3wL97gwdis8cwxWScL3ZpfikiMJbEGuaIHabiw7C+r/dQssW0 7SbG01yZWgn3HtJBfELs1cmqWCUN4F+Y28um0Y4VYHTpSnNuVHBJ1wtfqCSatWYC wQa+n7KtBEGpY7BbSDZ/oGuqfDzpgR41F1tX7ZRa5y24zWHRQLQ= =eO2u -----END PGP SIGNATURE----- -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEfjeSqdis99YzvBWI7ZfpDmKqfjQFAmnpt38ACgkQ7ZfpDmKq fjTopg//ViAbiWmRZnu7F5owFRPySQWCSM1RJfBWOTL/UJjSArP2JbkOudcgeXZo Wj6fk1soY8w3o6CJACq12HhUAjQq6/mCupTyDSgOETMn2x/ZknuE407MOMc0t51t iYnfICJNYs1u1uRC/b7PEALYT7lt3Ab6QGe5iO2kVrFqJoB1AxRDIQlfPAHiRILY Abbt9avcL+k76idhSC782BmAFqtogPeHBVYQzBOgw/LfWGQ8ckkk66f4X8E6QMzA CkDSt/bAWIM/iVKw6ag4VBvIbzY2sR1EieN2GlHj5Dx6xMBlQdDpETgTIfNYG7si Ndai7vbMh+Gff5JfYiKq94WJ2uAP4jI3phN2NXpcYwc0OmEEMlYc/lcIlje3Bb3o Y+yop6RoVQpN6zbzLnuCMiDmy1SB2yhWpYQm/bqR1Qsb8vBfWBD3fvdscWXabDl8 m3ii38melVIdjSR18Qf3j9MOXefHo3xu0t00/ppPCwnuKKbhSItvTI9vg8BxqWL8 7iZYhNBkoJTIpgmTaHAggNUKNoa3mNYTuwJr7o/i4Bhki2ggzR5dKiKE9PAXSLaG 1tvCoWVVA3gGklkxFYnUncghC/YbEBDYWlaXbfgOC/+fhix7HnRCNcwckxlww86m gZCa2DcTBWiVQ6PP/6LzgHgNn7mhriVs0cGGVOlTL/h/zjm5CDw= =1+mL -----END PGP SIGNATURE-----

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Northwest Territories joining Alberta in plans to scrap seasonal time changes
by Tim Parenti April 23, 2026

April 23, 2026

https://www.cbc.ca/news/canada/north/nwt-ends-daylight-saving-9.7170964 "[Northwest Territories] Premier R.J. Simpson announced Monday that the territory will move to end seasonal time changes and will adopt a year-round time standard instead." "Simpson has previously said the territory wouldn't end seasonal time changes until Alberta does." Meanwhile, Alberta's proposed change, mentioned yesterday <https://lists.iana.org/hyperkitty/list/tz@iana.org/thread/KHKTGFAIURBVZBBJB…>, has yet to be introduced in its Assembly and raises questions about whether the Regional District of East Kootenay will end up continuing to follow Alberta or joining the rest of British Columbia. From the NWT government press release: https://www.gov.nt.ca/en/newsroom/premier-rj-simpson-announces-end-seasonal… "Our government will begin the necessary planning to ensure a smooth transition here in the Northwest Territories. That includes developing a clear timeline, working with partners, and giving residents, businesses, and service providers the time they need to prepare." -- Tim Parenti

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Canada legislative summary as of 2026-04-22
by Tim Parenti April 23, 2026

April 23, 2026

All, Paul and I have discussed the recent news out of Alberta and the Northwest Territories in Canada and how that affects our plans for upcoming releases of tzdata. *tl;dr We are inclined to cut a release with the changes for BC shortly, while we wait for AB and NWT legislation to come through and to determine where areas such as the Regional District of East Kootenay (Cranbrook, BC) will land.* To be clear, we were already aiming to release for BC any day now, but the recent AB/NWT news did prompt another check and balancing of competing priorities. A detailed summary of our understanding of where things currently stand throughout western Canada follows: *British Columbia*'s premier, David Eby, announced a shift from UTC−8/−7 to year-round UTC−7 for the bulk of the province (America/Vancouver) on 2 March 2026, pursuant to Order in Council 63 of 2026, joining other areas of BC (America/Dawson_Creek, America/Fort_Nelson) which had already observed year-round UTC−7 and are thus unaffected. The order took effect on 9 March and affects wall clock times from 1 November 2026. *Alberta*'s premier, Danielle Smith, announced in an interview on Monday 20 April 2026 a planned shift from UTC−7/−6 to year-round UTC−6, aligning the province (America/Edmonton) with Saskatchewan's long-standing practice, with legislation to be introduced "this week" as part of an omnibus bill. Order papers for Alberta's Legislative Assembly suggest the referenced bill may be Bill 31, the *Red Tape Reduction Statutes Amendment Act, 2026*, but the Assembly rose before it could be formally introduced today (Wednesday) so no text is yet available. Following another sitting tomorrow (Thursday), Alberta's Legislative Assembly is scheduled to adjourn for a constituency week before sitting again from 4 to 14 May and then adjourning to late October. So, if the proposed change is envisioned to take effect from 1 November to imitate BC, then the bill would likely need to wind its way through the legislative process within the next few weeks. *Border areas* within BC, such as most of the Regional District of East Kootenay (Cranbrook) and eastern portions of the Regional District of Central Kootenay and the Columbia–Shuswap Regional District, currently remain with the *status quo* of UTC−7/−6. In particular, RDEK had previously said on 14 March that it would join the rest of BC on year-round UTC−7, but walked that back on 10 April while committing to a "public consultation process". Attached to the agenda for the 10 April RDEK Board meeting were 189 pages of public comment opposed to the March proposal and 66 pages in support. Given Alberta's recent announcement, it seems highly likely, then, that the region will ultimately choose one single year-round time or the other; if sticking with AB and UTC−6, no new zone would be needed, while if rejoining BC and UTC−7, a new zone would be needed. Meanwhile, any prolonged regional inaction could require our action in creating a new zone anyway, so we will need to keep a close eye on what this area decides and when. Upcoming RDEK Board meetings are scheduled for 8 May and 12 June. Similarly, Saskatchewan's *Time Act* may need legislative tweaks to better handle the area around Lloydminster, which straddles the border between AB and SK and has thus generally followed Alberta, but here it is much more reasonable to assume that the end result will ultimately be year-round UTC−6, once those two provinces are so aligned. Saskatchewan's Legislative Assembly is presently scheduled to sit until 14 May before similarly adjourning to late October. https://www.sasktoday.ca/provincial-news/implications-for-sask-of-alberta-m… *Northwest Territories*' premier, RJ Simpson, announced later on Monday 20 April 2026 that NWT (represented by America/Edmonton and America/Inuvik) would follow AB in shifting from UTC−7/−6 to year-round UTC−6, but gave no specific timeline, stating only that the NWT government will "begin the necessary planning", which includes "developing a clear timeline [and] working with partners". Again, assuming this goes forward alongside AB, no new zone will be needed, but legislative inaction could necessitate America/Yellowknife becoming its own zone rather than a link. The NWT Legislative Assembly has committee work scheduled in the next two weeks, 27 April through 8 May, and next sits from 27 May through 4 June before also adjourning to late October, so it may be some weeks before legislative details emerge there. * * * In short, because the AB and NWT changes are yet to be legislated and may take several more weeks to be finalized, it makes sense for us to wait on those and batch them, so as to also give more time to see how the various border areas react. Based on legislative calendars, it seems reasonable to think that any legislation which is to happen in these areas will happen by mid-June if it is to take effect for November 2026. In the meantime, a release now-ish with the changes for BC will allow those to start propagating and downstream vendors/projects to begin grappling with their various implementation details, including concepts such as "Pacific Time (US & Canada)" no longer meaning what they once did, before a follow-up release with AB and NWT changes hopefully by sometime in June similarly affects additional regions and concepts. Hopefully this ongoing situation is illustrative as to why we are extremely hesitant to promise any particular release timing. Any possible forward guidance we could give would always come with the asterisk "unless something else comes up". -- Tim Parenti

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[PROPOSED] Output a minimal time zone designation table
by Paul Eggert April 15, 2026

April 15, 2026

When keeping the time zone designation table small, also handle the case where an existing abbreviation is a suffix of the newly arrived abbreviation, so that only the latter abbreviation needs to be stored. The only TZif file in the current data affected by this change is Asia/Ho_Chi_Minh, which shrinks by 4 bytes because the earlier abbreviation LMT is a suffix of a later one PLMT. As a nice side effect, this patch also fixes an unlikely stack buffer overflow reported privately by Arthur Chan. * NEWS: Mention this. * zic.c (writezone, addtype): Handle an abbreviation being added when an existing abbreviation is its suffix. Without this patch both abbreviations would appear in this table, but only the longer abbreviation needs to be present. (checkabbr): New function, containing the checking part of the old newabbr function. (newabbr): Remove. Change uses to checkabbr + addabbr. (addabbr): New function, which is like the old newabbr’s adding code, except it removes any existing abbreviation that is a suffix of the new one. --- NEWS | 6 ++++ zic.c | 110 +++++++++++++++++++++++++++++++++++++++------------------- 2 files changed, 81 insertions(+), 35 deletions(-) diff --git a/NEWS b/NEWS index 1a97cbfe..09a15519 100644 --- a/NEWS +++ b/NEWS @@ -23,6 +23,12 @@ Unreleased, experimental changes "PST-167:59:58PDT-167:59:59,M11.5.6/-167:59:59,M12.5.6/-167:59:59", which can occur with adversarial input. (Thanks to Naveed Khan.) + zic no longer generates a longer TZif file than necessary when + an earlier time zone abbreviation is a suffix of a later one. + As a nice side effect, zic no longer overflows a buffer when given + a long series of abbreviations, each a suffix of the next. + (Buffer overflow reported by Arthur Chan.) + zic no longer overflows an int when processing input like ‘Zone Ouch 2147483648:00:00 - LMT’. The int overflow can lead to buffer overflow in adversarial cases. (Thanks to Naveed Khan.) diff --git a/zic.c b/zic.c index 6e859d09..7ecf3b91 100644 --- a/zic.c +++ b/zic.c @@ -253,12 +253,13 @@ symlink(char const *target, char const *linkname) (errno = ENOTSUP, -1) #endif -static void check_for_signal(void); +static int addabbr(char[TZ_MAX_CHARS], int *, char const *); static void addtt(zic_t starttime, int type); static int addtype(zic_t, char const *, bool, bool, bool); -static void leapadd(zic_t, int, int); static void adjleap(void); static void associate(void); +static void checkabbr(char const *); +static void check_for_signal(void); static void dolink(const char *, const char *, bool); static int getfields(char *, char **, int); static zic_t gethms(const char * string, const char * errstring); @@ -271,11 +272,11 @@ static void inrule(char ** fields, int nfields); static bool inzcont(char ** fields, int nfields); static bool inzone(char ** fields, int nfields); static bool inzsub(char **, int, bool); -static int itssymlink(char const *, int *); static bool is_alpha(char a); +static int itssymlink(char const *, int *); +static void leapadd(zic_t, int, int); static char lowerit(char); static void mkdirs(char const *, bool); -static void newabbr(const char * abbr); static zic_t oadd(zic_t t1, zic_t t2); static zic_t omul(zic_t, zic_t); static void outzone(const struct zone * zp, ptrdiff_t ntzones); @@ -2936,30 +2937,27 @@ writezone(const char *const name, const char *const string, char version, : i == thisdefaulttype ? old0 : i] = thistypecnt++; - for (i = 0; i < sizeof indmap / sizeof indmap[0]; ++i) - indmap[i] = -1; thischarcnt = stdcnt = utcnt = 0; for (i = old0; i < typecnt; i++) { - register char * thisabbr; - if (omittype[i]) continue; if (ttisstds[i]) stdcnt = thistypecnt; if (ttisuts[i]) utcnt = thistypecnt; - if (indmap[desigidx[i]] >= 0) - continue; - thisabbr = &chars[desigidx[i]]; - for (j = 0; j < thischarcnt; ++j) - if (strcmp(&thischars[j], thisabbr) == 0) - break; - if (j == thischarcnt) { - strcpy(&thischars[thischarcnt], thisabbr); - thischarcnt += strlen(thisabbr) + 1; - } - indmap[desigidx[i]] = j; + addabbr(thischars, &thischarcnt, &chars[desigidx[i]]); } + + /* Now that all abbrevs have been added to THISCHARS, + it is safe to set INDMAP without worrying about + whether the abbrevs might move later. */ + for (i = 0; i < TZ_MAX_CHARS; i++) + indmap[i] = -1; + for (i = old0; i < typecnt; i++) + if (!omittype[i] && indmap[desigidx[i]] < 0) + indmap[desigidx[i]] = addabbr(thischars, &thischarcnt, + &chars[desigidx[i]]); + if (pass == 1 && !want_bloat()) { hicut = thisleapexpiry = false; pretranstype = -1; @@ -3782,6 +3780,7 @@ static int addtype(zic_t utoff, char const *abbr, bool isdst, bool ttisstd, bool ttisut) { register int i, j; + int charcnt0; /* RFC 9636 section 3.2 specifies this range for utoff. */ if (! (-TWO_31_MINUS_1 <= utoff && utoff <= TWO_31_MINUS_1)) { @@ -3791,12 +3790,18 @@ addtype(zic_t utoff, char const *abbr, bool isdst, bool ttisstd, bool ttisut) if (!want_bloat()) ttisstd = ttisut = false; - for (j = 0; j < charcnt; ++j) - if (strcmp(&chars[j], abbr) == 0) - break; - if (j == charcnt) - newabbr(abbr); - else { + checkabbr(abbr); + + charcnt0 = charcnt; + j = addabbr(chars, &charcnt, abbr); + if (charcnt0 < charcnt) { + /* If an abbreviation was inserted, increment indexes no + earlier than the insert by the size of the insertion, + so that they continue to point to the same contents. */ + for (i = 0; i < typecnt; i++) + if (j <= desigidx[i]) + desigidx[i] += charcnt - charcnt0; + } else { /* If there's already an entry, return its index. */ for (i = 0; i < typecnt; i++) if (utoff == utoffs[i] && isdst == isdsts[i] && j == desigidx[i] @@ -4181,10 +4186,8 @@ will not work with pre-2004 versions of zic")); } static void -newabbr(const char *string) +checkabbr(char const *string) { - register int i; - if (strcmp(string, GRANDPARENTED) != 0) { register const char * cp; const char * mp; @@ -4203,13 +4206,50 @@ mp = _("time zone abbreviation differs from POSIX standard"); if (mp != NULL) warning("%s (%s)", mp, string); } - i = strnlen(string, TZ_MAX_CHARS - charcnt) + 1; - if (charcnt + i > TZ_MAX_CHARS) { - error(_("too many, or too long, time zone abbreviations")); - exit(EXIT_FAILURE); - } - strcpy(&chars[charcnt], string); - charcnt += i; +} + +/* Put into CHS, which currently contains *PNCHS bytes containing + NUL-terminated abbreviations none of which are suffixes of another, + the abbreviation ABBR including its trailing NUL. + If ABBR does not already appear in CHS, + possibly as a suffix of an existing abbreviation, + add ABBR to CHS, remove from CHS any abbreviation + that is a suffix of ABBR, and increment *PNCHS accordingly. + Return the index of ABBR after any modifications to CHS are made. + + If all abbreviations have already been added, this function + lets the caller look up the index of an existing abbreviation. */ +static int +addabbr(char chs[TZ_MAX_CHARS], int *pnchs, char const *abbr) +{ + int nchs = *pnchs; + int alen = strlen(abbr), nchs_incr = alen + 1; + int i; + for (i = 0; i < nchs; ) { + int clen = strlen(&chs[i]); + if (alen <= clen) { + /* If ABBR is a suffix of an abbreviation in CHS, + return the index of ABBR in CHS. */ + int isuff = i + (clen - alen); + if (memcmp(&chs[isuff], abbr, alen) == 0) + return isuff; + } else if (memcmp(&chs[i], &abbr[alen - clen], clen) == 0) { + /* An abbreviation in CHS is a substring of ABBR. + Replace it with ABBR, instead of the more-common + actions of appending ABBR or doing nothing. */ + nchs_incr = alen - clen; + break; + } + i += clen + 1; + } + if (TZ_MAX_CHARS < nchs + nchs_incr) { + error(_("too many, or too long, time zone abbreviations")); + exit(EXIT_FAILURE); + } + memmove(&chs[i + nchs_incr], &chs[i], nchs - i); + memcpy(&chs[i], abbr, nchs_incr); + *pnchs = nchs + nchs_incr; + return i; } /* Ensure that the directories of ARGNAME exist, by making any missing -- 2.53.0

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British Columbia will adopt permanent daylight saving time starting March 8, 2026, with no further seasonal clock changes.
by Francis, Jereme April 10, 2026

April 10, 2026

British Columbia will adopt permanent daylight saving time starting March 8, 2026, with no further seasonal clock changes. Please ensure this is updated in your database. Thank you. Jereme Francis This email and its attachments are confidential. Any unauthorized use or disclosure is prohibited. If you receive this email in error, please notify me by reply email and permanently delete the original without making any copies or disclosing its contents.

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[tz-announce] 2026a release of tz code and data available
by Paul Eggert via tz-announce April 8, 2026

April 8, 2026

The 2026a release of the tz code and data is available. This release corrects the time for Moldova's upcoming clock transition on March 29, as well as on other dates. It also has significant changes to code and to the build procedure. This release contains the following changes: Briefly: Moldova has used EU transition times since 2022. The "right" TZif files are no longer installed by default. -DTZ_RUNTIME_LEAPS=0 disables runtime support for leap seconds. TZif files are no longer limited to 50 bytes of abbreviations. zic is no longer limited to 50 leap seconds. Several integer overflow bugs have been fixed. Changes to past and future timestamps Since 2022 Moldova has observed EU transition times, that is, it has sprung forward at 03:00, not 02:00, and has fallen back at 04:00, not 03:00. (Thanks to Heitor David Pinto.) Changes to data Remove Europe/Chisinau from zonenow.tab, as it now agrees with Europe/Athens for future timestamps. Changes to build procedure The Makefile no longer by default installs an alternate set of TZif files for system clocks that count leap seconds. Install with 'make REDO=posix_right' to get the old default, which is rarely used in major downstream distributions. If your system clock counts leap seconds (contrary to POSIX), it is better to install with 'make REDO=right_only'. This change does not affect the leapseconds file, which is still installed as before. The Makefile's POSIXRULES option, which was declared obsolete in release 2019b, has been removed. The Makefile's build procedure thus no longer optionally installs the obsolete posixrules file. Changes to code Compiling with the new option -DTZ_RUNTIME_LEAPS=0 disables runtime support for leap seconds. Although this conforms to POSIX, shrinks tzcode's attack surface, and is more efficient, it fails to support Internet RFC 9636's leap seconds. zic now can generate, and localtime.c can now use, TZif files that hold up to 256 bytes of abbreviations, counting trailing NULs. The previous limit was 50 bytes, and some tzdata TZif files were already consuming 40 bytes. zic -v warns if it generates a file that exceeds the old 50-byte limit. zic -L can now generate TZif files with more than 50 leap seconds. This helps test TZif readers not limited to 50 leap seconds, as tzcode's localtime.c is; it has little immediate need for practical timekeeping as there have been only 27 leap seconds and possibly there will be no more, due to planned changes to UTC. zic -v warns if its output exceeds the old 50-second limit. localtime.c no longer accesses the posixrules file generated by zic -p. Hence for obsolete and nonconforming settings like TZ="AST4ADT" it now typically falls back on US DST rules, rather than attempting to override this fallback with the contents of the posixrules file. This removes library support that was declared obsolete in release 2019b, and fixes some undefined behavior. (Undefined behavior reported by GitHub user Naveed8951.) The posix2time, posix2time_z, time2posix, and time2posix_z functions now set errno=EOVERFLOW and return ((time_t) -1) if the result is not representable. Formerly they had undefined behavior that could in practice result in crashing, looping indefinitely, or returning an incorrect result. As before, these functions are defined only when localtime.c is compiled with the -DSTD_INSPIRED option. Some other undefined behavior, triggered by TZif files containing outlandish but conforming UT offsets or leap second corrections, has also been fixed. (Some of these bugs reported by Naveed8951.) localtime.c no longer rejects TZif files that exactly fit in its internal structures, fixing off-by-one typos introduced in 2014g. zic no longer generates a no-op transition when simultaneous Rule and Zone changes cancel each other out. This occurs in tzdata only in Asia/Tbilisi on 1997-03-30. (Thanks to Renchunhui for a test case showing the bug.) zic no longer assumes you can fflush a read-only stream. (Problem reported by Christos Zoulas.) zic no longer generates UT offsets equal to -2**31 and localtime.c no longer accepts them, as they can cause trouble in both localtime.c and its callers. RFC 9636 prohibits such offsets. zic -p now warns that the -p option is obsolete and likely ineffective. Here are links to the release files: https://www.iana.org/time-zones/repository/releases/tzcode2026a.tar.gz https://www.iana.org/time-zones/repository/releases/tzdata2026a.tar.gz https://www.iana.org/time-zones/repository/releases/tzdb-2026a.tar.lz The following convenience links are also available, although they may point to the previous release until the relevant caches are refreshed: https://www.iana.org/time-zones/repository/tzcode-latest.tar.gz https://www.iana.org/time-zones/repository/tzdata-latest.tar.gz https://www.iana.org/time-zones/repository/tzdb-latest.tar.lz Links are also available via plain HTTP, and via FTP from ftp://ftp.iana.org/tz/releases with the same basenames as above. Each release file has a GPG signature, which can be retrieved by appending ".asc" to the above URLs. Copies of these signatures are appended to this message. This release corresponds to commit dd6be6d1558163517ec55c652efac70842c3b4cc dated 2026-03-01 22:59:49 -0800 and tagged '2026a' in the development GitHub repository at <https://github.com/eggert/tz>. Here are the SHA3-512 checksums for the release files, generated by the GNU coreutils 9.8+ command 'cksum -a sha3 -l 512'. SHA3-512 (tzcode2026a.tar.gz) = 7106762916c6d21aa71fc5b43924582b603e231c90f19fb40ecd81db96208f8a4d6ff9664508c7298c521ab8fed97d4100665f84b2ba17caed04af129e40c5c2 SHA3-512 (tzdata2026a.tar.gz) = 898b090b74d927495a412f382636e4eb2f697e3e357e5a1d35e01cf95f6cdc3bd52533a269ae247b521c6ec1112cbc2df0bb5466accf376e2e7b78a3adde26bd SHA3-512 (tzdb-2026a.tar.lz) = 5aefc96aa15113da1c30fbba7564636e106e3c0e33f475d48f32c5d3417e945fada548176e56c474a85bf02681e101c7b4dd727eb0053d1d39a81c9a13afe37b Here are the SHA-512 checksums for the release files: 69a2ad3334ab1491ba349fcd5d3066a26b38ccb59031fec70ca19379cb0514fe2757af7bee31e796913c0cfc322134e2ba16f93ba07fa45cd4a415b9122b2f27 tzcode2026a.tar.gz 407e8e93aaa054a22a4a7d6d8cf480a20630073bf1a00956df16b10318f239a12015de38fad3072249193e314d6fddbff4e74afa40a88f7bf5c9eecc7659ea15 tzdata2026a.tar.gz 1824fc2e198a449ebaa41e6c679a494c486b848f13fe8f18f948fde0533e99f5f01e7e7298e257c565838d24ec743e824f402887abdf525d1ce578a714c71414 tzdb-2026a.tar.lz Here are GPG digital signatures for the release files: -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEfjeSqdis99YzvBWI7ZfpDmKqfjQFAmmlNgMACgkQ7ZfpDmKq fjS64g//TxOxFmBXtJRx4LM8QIL315hvWwVpVAmAk+oFzqjluosfb3xbszBw3fWw PzcOyQ8PDXV42dq29jO8JjVJkCrvLiBjXWTTV6yDRqp3TEBh5uM4cUormnfcTLkT bmgVLLmqiNZgZpEHrsQQKaf8Ia/23F2topG0USSzqguLgLBVLcdut8Djfqb5qpqV xurq88ciC+ZvLENJsBXyfJzN2neuCOelbXgPDz+LJZrv3mJqFrm7EzxHngE8xZ+j Ny0V6WFaZJisWEif4oGeTPtxQS+LT/2bDBKtNpcFQhvquS6dU0nHHVAvNAIZaGNf HeQ/LgxFDQjnIisoqKA61qNmZZ1F5rDuYtL/j53nhjJpLkaDAoEU+xfKtYybJzir mH7Dj8WwUcLwH7lT/U4KDZmiUiT49Vk/u/7+pI1Vx7OogJ4Vs9WTtCt8avNGkwFF qez91hNIb6iZzVbnSKz+TWlfnBgltFQU02ozTZNW6K3TawLuwgyMoAGX0kaK8Lxy 8KKEo53phmmFnZ9vQKEJkJdaaIuisK1qJH1K6cj2GX44bhpDfT/kq4AQQbR7HDWR ZSTB5oG4TvqfGd3bKrDzpGOOLJ2AoiBaGi+rcA8n4WWvdGxodIJ6RU1cDI+RHPfv 8caWfWcEtAPCciArx2pa10gupda67DF1pwxAYLEbr+dmg2S8jQI= =/yto -----END PGP SIGNATURE----- -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEfjeSqdis99YzvBWI7ZfpDmKqfjQFAmmlNgMACgkQ7ZfpDmKq fjR04A//YmSFvKQi/w8hfB5fAf4VSV+5HBIeuTRJPn9BuRAUvZVYl78ApYGzSqPh sG3H/IPprHICVxMJcPBvEI7+tXVPozCOnwUx7jz2nAvl7awxj5n2z1zs+jjZ+/pU kiQ4x4uZDJTw5wsymy9nPasoQba5kmSItjB7fDXe2wwjPOh3osOzSfC0KDnPvTxl jPxBTd+CXDmz5fiI7RPSi1uJWJFXEtE+NpaltQpA8J1M7QSv2O+7x3eLfNoa1Eh9 GQ5JjtvMixdQGxFzMeID/Y2Rjj3vKFpB0+blf1zu5aBchemmvW/DFpOBhdm+lRf0 Me1TVlmlBI3oj4lrNhGIz3f7zf+IrPVfAAQ/hMMcyYc/FwYuuV9SSF0Aj2pWR0Mi wvASEXb23bWu2t1aeu7by7XSnL033o1P5DqWDueVSilTdeVSOS0EtyyFMC6THmj4 PcQh7/O60zbPhsUXan85rOC1CNv9lZJlEzZShy3B3tAccGr4IKrPRT/jIhVwVbu9 rS25dLR9S/bcrYTpn4aaWMPQ9tuYJ/83i1euAgs7NjKao0lziPTOPaBvqW6fdg1v /4dHluvwMufDLa23WVy2iPueTPD8NDH228xwrtGm/Spyu3XCX7YZJdCJVcNF0E9m W4z5R07LGBZYKscd9T8otPJyzTLcunLmnaf/Mbsrj4FmB+dNof8= =SR0V -----END PGP SIGNATURE----- -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEfjeSqdis99YzvBWI7ZfpDmKqfjQFAmmlNgQACgkQ7ZfpDmKq fjRfhg//WKsUlkhd9treq8Q3YMju7fezVZhvinFib7mmC3kn3HM5Xo2AKakjtwYn d0ZDuA886qFp3Llkn3pwnEh8vugE0A86qRwk3D3RoL/QfpbKkrVyAWONEWCHMKF1 MswUEO01Lcxd+CmjFWsH+dEhJ8HHLlPgyYgWCy6X3zvTyCLK5navq93QTmIKBguy tXAtWClft7wEv4Sg6xI0MtcAMamt5aBP9oC284XJbjfHz169QcK5VaCJPG82kuDs ABorgc6KVJN88SzPWsajpEQQE17hsH99y+Jh4UR4Lx4s06+52zOl814t0Aru28B2 K8u0PF5mO3druoHN8ielp9gdqIMk5JbOobhezGmnNPQT2ZIazTBa22/zVknkqoLq 6NQnpPekc2sjuVljRYCRkDwWXaUYfl8gR7e59Ew45IfFBpRCfkpEFK4A97KGfGVM gSCdW/N+9lCG2p1MrrRETykyGCX181rtnw8RXO+ADxmz8ddQ5WRrmGIkBYi7iocY 2iULltrLOAzCnUGsN0x/7xk8fLf7MRX+cExUJG992foiPQ/6N/06gp6SNeJyuKgG hI5TO9RIsR8JzjfUpI0Nbr9ZwkQuLFfkvvXSZeYwVU4rFNEHaQqz4dVvcfTAwi1T 9AK8S/7FjRoh/aqbUe9rVsUAOUcoOAkgCd2bUkcYLQ8FXJqJPYA= =t0qu -----END PGP SIGNATURE-----

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B.C. Permanent Daylight Savings
by Matthew Lee April 6, 2026

April 6, 2026

Hello, will this database be updating for B.C. switching permanently to Daylight Savings Time? Thank you.

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Fwd: [PATCH] zic: avoid integer truncation in stringoffset bounds check
by Naveed Khan April 1, 2026

April 1, 2026

---------- Forwarded message --------- From: <dxbnaveed.k(a)gmail.com> Date: Wed, Mar 18, 2026 at 2:13 AM Subject: [PATCH] zic: avoid integer truncation in stringoffset bounds check To: <tz(a)iana.org> Cc: rootvector2 <dxbnaveed.k(a)gmail.com> From: rootvector2 <dxbnaveed.k(a)gmail.com> --- zic.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/zic.c b/zic.c index c0891001..64090fce 100644 --- a/zic.c +++ b/zic.c @@ -3171,6 +3171,7 @@ stringoffset(char *result, zic_t offset) register int hours; register int minutes; register int seconds; + zic_t zhours; bool negative = offset < 0; int len = negative; @@ -3182,11 +3183,12 @@ stringoffset(char *result, zic_t offset) offset /= SECSPERMIN; minutes = offset % MINSPERHOUR; offset /= MINSPERHOUR; - hours = offset; - if (hours >= HOURSPERDAY * DAYSPERWEEK) { + zhours = offset; + if (zhours >= HOURSPERDAY * DAYSPERWEEK) { result[0] = '\0'; return 0; } + hours = zhours; len += sprintf(result + len, "%d", hours); if (minutes != 0 || seconds != 0) { len += sprintf(result + len, ":%02d", minutes); -- 2.52.0

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[PROPOSED] zic now checks for signals more often
by Paul Eggert March 17, 2026

March 17, 2026

* NEWS: Mention this. * zic.c (verror, make_links, main, get_rand_u64) (random_dirent, open_outfile, dolink, inputline, infile): Be better about checking for signals, e.g., when the input or the random number generator is giving is trouble, so that it’s easier for the user to control-C out. Although the result is not perfect it should be good enough for practical use. --- NEWS | 2 ++ zic.c | 35 ++++++++++++++++++++++------------- 2 files changed, 24 insertions(+), 13 deletions(-) diff --git a/NEWS b/NEWS index d4ba011b..fa791cb9 100644 --- a/NEWS +++ b/NEWS @@ -28,6 +28,8 @@ Unreleased, experimental changes which can occur with adversarial input. (Thanks to GitHub user rootvector2.) + zic now checks for signals more often. + Release 2026a - 2026-03-01 22:59:49 -0800 diff --git a/zic.c b/zic.c index 77396228..c0891001 100644 --- a/zic.c +++ b/zic.c @@ -253,6 +253,7 @@ symlink(char const *target, char const *linkname) (errno = ENOTSUP, -1) #endif +static void check_for_signal(void); static void addtt(zic_t starttime, int type); static int addtype(zic_t, char const *, bool, bool, bool); static void leapadd(zic_t, int, int); @@ -704,6 +705,7 @@ eat(int fnum, lineno num) ATTRIBUTE_FORMAT((printf, 1, 0)) static void verror(const char *const string, va_list args) { + check_for_signal(); /* ** Match the format of "cc" to allow sh users to ** zic ... 2>&1 | error -t "*" -v @@ -1074,6 +1076,7 @@ make_links(void) warning(_("link %s targeting link %s"), links[i].l_linkname, links[i].l_target); } + check_for_signal(); } } @@ -1391,6 +1394,7 @@ main(int argc, char **argv) for (j = i + 1; j < nzones && zones[j].z_name == NULL; ++j) continue; outzone(&zones[i], j - i); + check_for_signal(); } make_links(); if (lcltime != NULL) { @@ -1486,9 +1490,11 @@ get_rand_u64(void) static int nwords; if (!nwords) { ssize_t s; - do + for (;; check_for_signal()) { s = getrandom(entropy_buffer, sizeof entropy_buffer, 0); - while (s < 0 && errno == EINTR); + if (! (s < 0 && errno == EINTR)) + break; + } nwords = s < 0 ? -1 : s / sizeof *entropy_buffer; } @@ -1516,7 +1522,7 @@ get_rand_u64(void) rmod = INT_MAX < UINT_FAST64_MAX ? 0 : UINT_FAST64_MAX / nrand + 1, r = 0, rmax = 0; - do { + for (;; check_for_signal()) { uint_fast64_t rmax1 = rmax; if (rmod) { /* Avoid signed integer overflow on theoretical platforms @@ -1527,7 +1533,9 @@ get_rand_u64(void) rmax1 = nrand * rmax1 + rand_max; r = nrand * r + rand(); rmax = rmax < rmax1 ? rmax1 : UINT_FAST64_MAX; - } while (rmax < UINT_FAST64_MAX); + if (UINT_FAST64_MAX <= rmax) + break; + } return r; } @@ -1574,9 +1582,11 @@ random_dirent(char const **name, char **namealloc) *name = *namealloc = dst; } - do + for (;; check_for_signal()) { r = get_rand_u64(); - while (unfair_min <= r); + if (r < unfair_min) + break; + } for (i = 0; i < suffixlen; i++) { dst[dirlen + prefixlen + i] = alphabet[r % alphabetlen]; @@ -1611,7 +1621,7 @@ open_outfile(char const **outname, char **tempname) if (!*tempname) random_dirent(outname, tempname); - while (true) { + for (;; check_for_signal()) { int oflags = O_WRONLY | O_BINARY | O_CREAT | O_EXCL; int fd = open(*outname, oflags, creat_perms); int err; @@ -1725,8 +1735,6 @@ dolink(char const *target, char const *linkname, bool staysymlink) char const *outname = linkname; int targetissym = -2, linknameissym = -2; - check_for_signal(); - if (strcmp(target, "-") == 0) { if (remove(linkname) == 0 || errno == ENOENT || errno == ENOTDIR) return; @@ -1739,7 +1747,7 @@ dolink(char const *target, char const *linkname, bool staysymlink) } } - while (true) { + for (;; check_for_signal()) { if (linkat(AT_FDCWD, target, AT_FDCWD, outname, AT_SYMLINK_FOLLOW) == 0) { link_errno = 0; @@ -1791,7 +1799,7 @@ dolink(char const *target, char const *linkname, bool staysymlink) int symlink_errno = -1; if (contents) { - while (true) { + for (;; check_for_signal()) { if (symlink(contents, outname) == 0) { symlink_errno = 0; break; @@ -1822,7 +1830,7 @@ dolink(char const *target, char const *linkname, bool staysymlink) exit(EXIT_FAILURE); } tp = open_outfile(&outname, &tempname); - while ((c = getc(fp)) != EOF) + for (; (c = getc(fp)) != EOF; check_for_signal()) putc(c, tp); close_file(tp, directory, linkname, tempname); close_file(fp, directory, target, NULL); @@ -1946,7 +1954,7 @@ static bool inputline(FILE *fp, char *buf, ptrdiff_t bufsize) { ptrdiff_t linelen = 0, ch; - while ((ch = getc(fp)) != '\n') { + for (; (ch = getc(fp)) != '\n'; check_for_signal()) { if (ch < 0) { if (ferror(fp)) { error(_("input error")); @@ -2033,6 +2041,7 @@ infile(int fnum, char const *name) default: unreachable(); } } + check_for_signal(); } close_file(fp, NULL, filename(fnum), NULL); if (wantcont) -- 2.51.0

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[PROPOSED] Fix zic buffer overflow when computing TZ
by Paul Eggert March 17, 2026

March 17, 2026

Problem reported by GitHub user rootvector2. * NEWS: Mention this. * zic.c (outzone): Increase envvar len max. --- NEWS | 5 +++++ zic.c | 6 +++++- 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/NEWS b/NEWS index 905a086d..d4ba011b 100644 --- a/NEWS +++ b/NEWS @@ -23,6 +23,11 @@ Unreleased, experimental changes zic no longer mishandles a last transition to a new time type. + zic no longer overflows a buffer when generating a TZ string like + "PST-167:59:58PDT-167:59:59,M11.5.6/-167:59:59,M12.5.6/-167:59:59", + which can occur with adversarial input. (Thanks to GitHub + user rootvector2.) + Release 2026a - 2026-03-01 22:59:49 -0800 diff --git a/zic.c b/zic.c index 225ad419..77396228 100644 --- a/zic.c +++ b/zic.c @@ -3416,12 +3416,16 @@ outzone(const struct zone *zpfirst, ptrdiff_t zonecount) int nonTZlimtype = -1; zic_t max_year0; int defaulttype = -1; + int max_stringoffset_len = sizeof "-167:59:59" - 1; + int max_comma_stringrule_len = (sizeof ",M12.5.6/" - 1 + + max_stringoffset_len); check_for_signal(); /* This cannot overflow; see FORMAT_LEN_GROWTH_BOUND. */ max_abbr_len = 2 + max_format_len + max_abbrvar_len; - max_envvar_len = 2 * max_abbr_len + 5 * 9; + max_envvar_len = 2 * (max_abbr_len + max_stringoffset_len + + max_comma_stringrule_len); startbuf = xmalloc(max_abbr_len + 1); ab = xmalloc(max_abbr_len + 1); -- 2.51.0

1 0

Request to delay America/Vancouver tm_isdst transition until November
by Robert Bastian March 11, 2026

March 11, 2026

The change in 8b46071 <https://github.com/eggert/tz/commit/8b46071fd85a7a9434d63894bac64d30362cc16d> sets America/Vancouver's tm_isdst flag to false starting this Monday. Because CLDR keys its display names by this flag, this change will cause ICU and other downstream software (including major operating systems) to display BC’s UTC-7 as "Pacific Standard Time," while Los Angeles’ UTC-7 will display as "Pacific Daylight Time." The CLDR and ICU Technical Committees have evaluated several immediate paths forward, including new display names or a generic "UTC-7" (both of which are not sensitive to the tm_isdst value). However, due to the tight timeline (CLDR releases don't propagate as quickly as TZDB releases), and the uncertainty around the name that will actually be used in the real world, we have determined that continuing to use "Pacific Daylight Time" through this summer is the least confusing solution for users, as it maintains alignment across the Pacific Time corridor until BC actually diverges in November. To support this, we ask that the change to the tm_isdst flag be delayed until November, at least in the rearguard version of the TZDB. This will give us time to determine the name that people will be using, remodel CLDR's data, acquire translations, and ship a release to devices. Best regards, Robert *(On behalf of the CLDR/ICU Technical Committees)*

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