- tz - lists.iana.org

Anniversary
by Arthur David Olson Dec. 13, 2021

Dec. 13, 2021

Discussion at an online meeting today made me realize that, alas, we missed the recent 35th anniversary of the start of the time zone mailing list. Put 2026-11-25 on your calendars now.-) https://mm.icann.org/pipermail/tz/1986-November/008946.html @dashdashado

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[PROPOSED] Distribute tarballs in ustar rather than gnu form
by Paul Eggert Dec. 13, 2021

Dec. 13, 2021

It recently came to my attention that tzdb tarballs are not generated in standard POSIX ustar format, but instead use a trivially different but nonstandard format. Fix this by switching to the standard format. * Makefile (GNUTARFLAGS): Add --format=ustar. * NEWS: Document the change. --- Makefile | 3 ++- NEWS | 10 ++++++++++ 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/Makefile b/Makefile index c89c1be..fd312d9 100644 --- a/Makefile +++ b/Makefile @@ -466,7 +466,8 @@ OK_LINE= '^'$(OK_CHAR)'*$$' # Flags to give 'tar' when making a distribution. # Try to use flags appropriate for GNU tar. -GNUTARFLAGS= --numeric-owner --owner=0 --group=0 --mode=go+u,go-w --sort=name +GNUTARFLAGS= --format=ustar --numeric-owner --owner=0 --group=0 \ + --mode=go+u,go-w --sort=name TARFLAGS= `if tar $(GNUTARFLAGS) --version >/dev/null 2>&1; \ then echo $(GNUTARFLAGS); \ else :; \ diff --git a/NEWS b/NEWS index 572a161..edb9a1d 100644 --- a/NEWS +++ b/NEWS @@ -20,6 +20,16 @@ Unreleased, experimental changes reader no longer mistakenly attempts to parse a version 1 TZIf file header as a TZ string. + Changes to build procedure + + Distribution tarballs now use standard POSIX.1-1988 ustar format + instead of GNU format. Although the formats are almost identical + for these tarballs, ustar headers' magic fields contain "ustar" + instead of "ustar ", and their version fields contain "00" instead + of " ". For details about ustar format, please see + "pax - portable archive interchange", IEEE Std 1003.1-2017, + <https://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_…>. + Changes affecting documentation and commentary Rename CONTRIBUTING to CONTRIBUTING.md and use Markdown format. -- 2.32.0

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.UA uses both kiev.ua and kyiv.ua, sebastopol.ua, uzhgorod.ua
by Brian Inglis Dec. 11, 2021

Dec. 11, 2021

...and other spellings for backward compatibility and convenience e.g. odessa.ua, sebastopol.ua with sevastopol.ua reserved, uzhgorod.ua (no mention of uzhhorod.ua even as reserved); from: https://hostmaster.ua/2ld/ referenced by the Public Suffix List package. Headings translated: Public domains second level =========================== Thematic domains ---------------- com.ua in.ua org.ua net.ua Specialty domains ----------------- edu.ua gov.ua Geographical domains -------------------- cherkassy.ua cherkasy.ua ck.ua chernigov.ua chernihiv.ua cn.ua chernovtsy.ua chernivtsi.ua cv.ua crimea.ua dnepropetrovsk.ua dnipropetrovsk.ua dp.ua donetsk.ua dn.ua ivano-frankivsk.ua if.ua kharkov.ua kh.ua kharkiv.ua kherson.ua ks.ua khmelnitskiy.ua km.ua kiev.ua kyiv.ua kirovograd.ua kr.ua lugansk.ua lg.ua lutsk.ua lt.ua volyn.ua lviv.ua nikolaev.ua mk.ua odessa.ua od.ua odesa.ua poltava.ua pl.ua rovno.ua rivne.ua rv.ua sebastopol.ua sumy.ua sm.ua ternopil.ua te.ua uzhgorod.ua uz.ua vinnica.ua vn.ua yalta.ua zaporizhzhe.ua zp.ua zhitomir.ua zt.ua Reserved domain names --------------------- cr.ua khmelnytskyi.ua kropyvnytskyi.ua krym.ua kv.ua lv.ua mykolaiv.ua sb.ua sevastopol.ua sicheslav.ua vinnytsia.ua zaporizhzhia.ua zhytomyr.ua Technological domains --------------------- admin.ua ipv6.ua ns.ua ua.ua www.ua xn--mqa.ua dnssec.ua rdap.ua epp1.ua epp2.ua This documents that proposed alternative English spellings may be neither as common nor the issue as settled as the trolls claim. -- Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada This email may be disturbing to some readers as it contains too much technical detail. Reader discretion is advised. [Data in binary units and prefixes, physical quantities in SI.]

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Israel DST: Proposed Change of Start of DST
by Ephraim Silverberg Dec. 5, 2021

Dec. 5, 2021

The Minister of Interior, Ayelet Shaked, is proposing to change the Time Law so that DST will start in Israel at 2 a.m. on the *Friday *before the *second *Sunday of March. DST starts, according to the current law, at 2 a.m. on the Friday before the *last* Sunday in March. The proposed change has yet to be brought before the Knesset. I will endeavour to update the list if the proposed change receives Knesset approval.

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America/SaoPaulo TZ still observing DST
by William Renan Santos (DHL Supply Chain) Dec. 4, 2021

Dec. 4, 2021

Hi, In Brazil the DST was revoked few years ago by government, but looks like the systems are still considering the DST change. I ran the tzupdater using latest file of tzdata and the systems are still considering 1 hour ahead in Sao Paulo. Could you please help me to review and point where in the tzdata file the DST for Brazil was removed? Thanks! William Santos LATAM - IT Products Sr Systems Analyst DHL Supply Chain Estrada da Cruz Grande, 1700 Louveira - SP ZipCode: 13290-000 Brazil Telephone: +55 19 3848 9377 william.r.santos(a)dhl.com<mailto:william.r.santos@dhl.com> www.dhl.com/supplychain<http://www.dhl.com/supplychain> DHL Supply Chain - Excellence. Simply delivered. [top_em]

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Proposal: Sections for different kinds of backward links
by Stephen Colebourne Nov. 18, 2021

Nov. 18, 2021

I have taken a stab at splitting the `backward` file into sections. This is based on repeated observations made by multiple people that the file represents different kinds of Link. https://github.com/eggert/tz/pull/33 The sections I'm suggesting are: CROSS-ISO - These link across an ISO-3166 boundary EXCESS - These were added despite the locations having the same timekeeping since 1970 RENAMED - These are simple aliases/renames OBSOLETE - These are the most obsolete form of IDs FIXED - These are alternate names for fixed offsets I don't expect this PR to be merged as is - There will probably need to be some consideration as to the correct split, and as to whether each ID is in the correct section. The approach I've used is commented sections with stable section names. Alternate approaches to this problem are possible. For example, a new file could be created for each section. That seems to be more disruptive than the proposed approach. Note that in order for this change to be useful, the section names need to be considered part of the source file API, and maintained over time. thanks Stephen

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Re: [tz] tz Digest, Vol 122, Issue 22
by nadir altinbas Nov. 14, 2021

Nov. 14, 2021

@ Comment; Time(Winter-summer) setting discussions in Turkey and research about it (Alan Mintz) May I remind to Alan Mintz ;On the "en.wikipedia.org/wiki/List_of_countries_and_dependencies_by_population" list shows that Turkey is in Asia, One of the region where is called as Marmara region is in Europe . Turkey is in both of Asia and Europe. Coordinates for Turkey as follows; ------------------------------------------- Latitude: 38° 57' 26.43" N Longitude: 35° 14' 26.67" E ------------------------------------------ also in GPS DD coordinate; 38.9573415 35.240741 ----------------------------------------- Nadir Altinbas nadiraltinbas(a)yahoo.com n.altinbas On Sunday, November 14, 2021, 05:27:55 PM GMT+3, tz-request(a)iana.org <tz-request(a)iana.org> wrote: Send tz mailing list submissions to tz(a)iana.org To subscribe or unsubscribe via the World Wide Web, visit https://mm.icann.org/mailman/listinfo/tz or, via email, send a message with subject or body 'help' to tz-request(a)iana.org You can reach the person managing the list at tz-owner(a)iana.org When replying, please edit your Subject line so it is more specific than "Re: Contents of tz digest..." Today's Topics: 1. Re: Time(Winter-summer) setting discussions in Turkey and research about it (nadir altinbas) 2. Re: Time(Winter-summer) setting discussions in Turkey and research about it (Alan Mintz) ---------------------------------------------------------------------- Message: 1 Date: Sat, 13 Nov 2021 15:36:25 +0000 (UTC) From: nadir altinbas <nadiraltinbas(a)yahoo.com> To: Paul Eggert <eggert(a)cs.ucla.edu> Cc: Time Zone Mailing List <tz(a)iana.org> Subject: Re: [tz] Time(Winter-summer) setting discussions in Turkey and research about it Message-ID: <2020539311.1385787.1636817785458(a)mail.yahoo.com> Content-Type: text/plain; charset=UTF-8 Ok ! Paul, Thanks,wikipedia correction explanation was better. Nadir Altinbas n.altinbas On Saturday, November 13, 2021, 11:15:33 AM GMT+3, Paul Eggert <eggert(a)cs.ucla.edu> wrote: Thanks for the heads-up. If Turkey actually changes its time zones or daylight-saving rules please let us know. I hope they give us plenty of warning (such as a year or more); otherwise, their cell phones and/or computers will likely be off. One minor point. The text says "Saatlerini de?i?tirmeyen en b?y?k ?lkeler ?in, Hindistan ve Japonya" which Google translates as "The largest countries that do not change their clocks are China, India and Japan." Using the Wikipedia list of countries by population[1], the ten most populous countries that do not observe daylight saving time are China, India, Indonesia, Pakistan, Brazil, Nigeria, Bangladesh, Russia, Japan, and Ethiopia, in that order. [1] https://en.wikipedia.org/wiki/List_of_countries_and_dependencies_by_populat… ------------------------------ Message: 2 Date: Sat, 13 Nov 2021 10:48:15 -0800 From: Alan Mintz <alan.mintz(a)gmail.com> To: Paul Eggert <eggert(a)cs.ucla.edu> Cc: Time Zone Mailing List <tz(a)iana.org>, nadir altinbas <nadiraltinbas(a)yahoo.com> Subject: Re: [tz] Time(Winter-summer) setting discussions in Turkey and research about it Message-ID: <CAMLM5-Vkqs_k7HkGy+MPwWGcjAUzRXhu4OOkAdFywvy-Ppj5rw(a)mail.gmail.com> Content-Type: text/plain; charset="utf-8" On Sat, Nov 13, 2021 at 12:15 AM Paul Eggert via tz <tz(a)iana.org> wrote: > ... Using the Wikipedia list of countries by population[1], the ten > most populous countries that do not observe daylight saving time are > China, India, Indonesia, Pakistan, Brazil, Nigeria, Bangladesh, Russia, > Japan, and Ethiopia, in that order. > > [1] > > https://en.wikipedia.org/wiki/List_of_countries_and_dependencies_by_populat… > Kind of a misleading statistic, though, since Indonesia straddles the equator and much of Brazil, Nigeria, and Ethiopia are within 15 degrees latitude, making DST unnecessary for them. -- Alan Mintz <Alan.Mintz(a)gMail.com>

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Time(Winter-summer) setting discussions in Turkey and research about it
by nadir altinbas Nov. 13, 2021

Nov. 13, 2021

Thank You Paul! Resending e -mail message as plain Text as follows.Amendment e -mail; GMT+2.30 adviced by Turkeys Electrical Engineers Society (TMMOB-EMO) for eficiently enery usage in the country, on the news dealing with conflict while settings winter and summer time through organization. here is the link about news as Turkish; (www.emo.org.tr/genel/bizden_detay.php?kod=136372&tipi=5&sube=0) There also mentioned a research by ITU (Istanbul technical University research about time arrangement. These are just discussions and advice not officially anouncment. nadiraltinbas(a)yahoo.com Nadir Altinbas n.altinbas

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Tİme zone discussions in Turkey and research about it
by nadir altinbas Nov. 12, 2021

Nov. 12, 2021

For GMT +2.30 adviced from Turkey's Electrical Engineers Society (TMMOB-EMO) reported on Social mediato efficient energy usage in Turkey. news here on the link as follows;EMO - SAATLERE AYAR ARANIYOR (OKSİJEN) | | | | | | | | | | | EMO - SAATLERE AYAR ARANIYOR (OKSİJEN) | | | This research is not official now.It may be considered future plan nadiraltinbas(a)yahoo.com n.altinbas

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Pre-1970 data
by Stephen Colebourne Nov. 12, 2021

Nov. 12, 2021

How can this project successfully handle pre-1970 data? Why have I focussed so much on IDs and their value to tzdb? Intro ------- In previous threads I've focussed on IDs, and laid out different ways to describe the groups of IDs we have. For now, lets focus solely on the two main groups - region IDs, which represent abstract regions where clocks have been the same since 1970 - non-region IDs, which represent locations where tzdb has, at some point, added an ID The key observation is that the segregation between these two groups of IDs *did not exist* until around 2014. It was only in 2018 that the ISO country rule was removed. It has only been since 2014 or so that IDs have been merged. What tzdb previously offered was a set of IDs, based on a simple rule - "ID as needed for post-1970 data, with at least one per ISO country". Full history was available for each of these (whether accurate or not). What has happened since is a split, where no split previously existed. A split which favours some locations over others. The recent mailing list debates merely represent the cumulation of this favouritism. The irony is that the merges are being done in the name of equity and fairness, when the outcome has actually been the exact opposite - picking favourites, and denigrating everywhere else. That the approach to picking favourites is according to a standardised largest city rule isn't really that relevant here - it is the outcome that is unfair, not the process. If region IDs were of different appearance (eg. numeric or textually different) then the issues would not have arisen. The mistake was taking a fully functional and fully integral set of IDs, and bifurcating it into two groups. The split was actually a huge change in the policy of tzdb, which has been added drip by drip, rather than something that was ever fully appreciated up front. FWIW, it is clear to me that there is an aspect of imposing a US-centric timezone system on other parts of the world. The recent tzdb approach of focussing entirely on timezone regions makes perfect sense for the US, where region boundaries do not follow state lines, and ordinary members of the public need to be aware of whether they are in US/Mountain or US/Central. This simply isn't the timezone model in many other parts of the world. In places like Europe and Asia, the timezone is driven primarily by the country you live in - an ordinary member of the public in Iceland is never going to associate with some abstract timezone region stretching down the Atlantic that is not named, not legally defined and is little more than a random outcome based on tzdb's choice of 1970. Even in somewhere like Norway, an ordinary member of the public will understand that although they follow CET, their timezone is actually driven by their Government in Oslo. The brilliance of the original rule - "ID as needed for post-1970 data, with at least one per ISO country" - was that it seamlessly handled *both* models of timezone in one unified set of IDs. Removal of the ISO country part has completely destabilised that balance. As a constraint to this thread, tzdb really needs to offer one standard view of data, not command line flags that allow different views. If downstream projects end up with different views of the data, it makes tzdb a much less reliable source. (tzdb can be packaged in different ways on the same machine, for example it is undesirable for Postgres' internal tzdb and the OS tzdb to diverge for the same version). Given this, what needs to be nailed down is what is the default data set that tzdb publishes - there isn't really much point in talking about compile time flags, or that the contents of backzone could be used by someone. Lets look at seven options for pre-1970 data: Pre-1970 data for regions only ----------------------------------------- 1) Pre-1970 data for regions only - Despite looking identical to other IDs, region IDs are treated as special/favoured - Pre-1970 data for non-region IDs is of no importance whatsoever, thus most get pre-1970 data from another country/continent - The split between region and non-region locations is fully completed - the US-centric timezone model is dominant - An end user in Iceland is supposed to use Africa/Abidjan, Europe/Reykjavik is treated as a historical mistake of tzdb kept around only for backwards compatibility Pre-1970 data for most IDs ------------------------------------ 2) Pre-1970 data for each ID meeting the rule "ID as needed for post-1970 data, with at least one per ISO country" - The split between region and non-region locations is healed - High quality data from places like Iceland and Norway is retained, but low quality data from elsewhere is restored - The pre-1970 data is simply viewed as the best available data for the each location which can be improved over time - Most end-users in Iceland would expect tzdb to provide pre-1970 data from Iceland, not the Ivory Coast 3) Pre-1970 data for for all IDs that currently exist except true aliases - This is very similar to #2, but would include something like Montreal which was effectively mistakenly added to tzdb - This doesn't seem as desirable as #2 4) Pre-1970 data for any ID where the pre-1970 data is high quality - Subjective on quality, which doesn't seem like a great idea - It does avoid bringing bad quality data back into the main tzdb distribution - On balance, #2 has fewer places for debate to arise 5) Pre-1970 data for all IDs that currently exist except true aliases, plus a *new* set of IDs representing regions - As per #2, but adding IDs like "Region/12345" or "Region/Berlin" - Regions should contain post-1970 data only, as the region is by definition only meaningful post-1970 - It is not entirely clear what this solves over just going with #2 - This option is connected to Russ' proposals [1], although he suggests a bigger split between timekeeping data and ID naming - Perhaps it makes sense if the new region IDs were internal and not normally seen by end users? Remove pre-1970 data from general use ------------------------------------------------------- 6) No pre-1970 data whatsoever, all IDs are post-1970 only - Project policy is that tzdb is focussed on post-1970 data only - Paul repeatedly tells us that pre-1970 data is unreliable, and people shouldn't use it - Pre-1970 data would not be deleted, but would not be available in most downstreams - The split between region and non-region locations is effectively healed - End users lose access to pre-1970 data, which is particularly notable in some locations where that data is reliable, eg London - It is unknown at this point what the user impact is of removing pre-1970 data from major financial/business centres (no major location has yet been merged) 7) No existing IDs get pre-1970 data, but a *new* set of IDs are created containing it - As per #5, the existing IDs get no pre-1970 data and the split between region and non-region locations is healed - New IDs, such as "Historic/Europe/London" or "Historic/Africa/Abidjan" get created for each of the main IDs - The historic IDs include pre-1970 data, the standard IDs do not - There is a mechanical transformation between the historic and non-historic IDs - Whether downstreams do or do not include the historic IDs is their choice, potentially based on available space - The data provided by the standard non-historic IDs remains the same whether the downstream includes the historic IDs or not (a Good Thing) - Users have to deliberately opt-in to get pre-1970 data, which might make them think about the accuracy issue Notes -------- - I'm not discussing adding new IDs simply to represent locations whose clocks differ only before 1970. I don't personally think that is a job for tzdb, and even if it is, it is a job for a different thread. - I'm not discussing what value is returned prior to 1970 when pre-1970 data is removed. That would be a job for a different thread. - Link vs Zone is not important for this discussion. Summary ------------- After a few weeks of thinking, these are the options I've come up with. Feel free to suggest another option or variant if you think I've missed anything obvious. I believe that was a disaster that the brilliant "ID as needed for post-1970 data, with at least one per ISO country" rule was removed. It has created needless division, bifurcating a unified set of ID into region and non-region IDs and creating backwards compatibility issues in the data of many locations. IMO, there are two basic models of timezones in the world, and moving tzdb from one that supported both to one that only supports the US-centric model is simply a mistake that needs correcting. As such, my preference would be to adopt option 2. Option 6 or 7 could work, and might be the best choices if we had a clean slate or if there was some hidden pressure that the list is unaware of to remove pre-1970 data, but they are risky options given we do not know the impact on end-users in major financial/business centres. Stephen [1] https://mm.icann.org/pipermail/tz/2021-September/030518.html

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