- tz - lists.iana.org

Tzdb and the Sunshine Protection Act
by Brooks Harris March 5, 2023

March 5, 2023

You've seen the Sunshine Protection Act is back: Congress to consider making daylight saving time permanent https://www.axios.com/2023/03/02/daylight-saving-time-change-permanent-cong… As I read the law it would shift STDOFF by an hour, for example, America/New_York would move to -04:00 STDOFF, essentially moving "Eastern Time" into the Atlantic time zone. Historically tzdb has honored the laws as faithfully as possible so that might be the right approach. But it seems to me this would be technically disruptive, necessitating a great deal of careful modification of existing implementations. The other method is to shift DST rules to "permanent" DST. The law might arguably be interpreted this way. That might be less disruptive and leave the option of returning to DST when its no longer "permanent", as happened in the 1970s. There are many arguments for going to "permanent standard time" instead. One reason not mentioned is that it would be technically much easier and less disruptive. How will tzdb manage this?

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[PROPOSED 1/2] Be more realistic in tzfile example
by Paul Eggert March 3, 2023

March 3, 2023

* tzfile.5 (TZ): Give a real-world TZ example instead of an imaginary one. --- tzfile.5 | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tzfile.5 b/tzfile.5 index c3e86c62..1bd561ab 100644 --- a/tzfile.5 +++ b/tzfile.5 @@ -220,7 +220,7 @@ if there is no POSIX-style representation for such instants. If nonempty, the POSIX-style TZ string must agree with the local time type after the last transition time if present in the eight-byte data; for example, given the string -.q "WET0WEST,M3.5.0,M10.5.0/3" +.q "WET0WEST,M3.5.0/1,M10.5.0" then if a last transition time is in July, the transition's local time type must specify a daylight-saving time abbreviated .q "WEST" -- 2.37.2

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Sunshine Protection Act in the news
by Arthur David Olson March 3, 2023

March 3, 2023

"Bill to make daylight saving time permanent reintroduced in Congress" https://thehill.com/homenews/nexstar_media_wire/3880009-bill-to-make-daylig… @dashdashado

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Paraguay on its way to stay on DST
by Carlos Raúl Perasso March 2, 2023

March 2, 2023

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

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Egypt daylight savings will be back
by Ahmad ElDardiry March 2, 2023

March 2, 2023

Hello, Egypt officially announced today that daylight savings will be applied from last Friday of April to last Thursday of October. https://www.mena.org.eg/ar/news/dbcall/table/textnews/id/10044253#:~:text=2… .

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Time for a Lunar time zone?
by Tim McBrayer March 2, 2023

March 2, 2023

On the lighter side; we may need to consider going interplanetary. https://theweek.com/space/1021396/why-space-experts-want-to-establish-a-lun… https://epaper.bostonglobe.com/infinity/article_popover_share.aspx?guid=8fc… -- Tim McBrayer NOTICE from Ab Initio: This email (including any attachments) may contain information that is subject to confidentiality obligations or is legally privileged, and sender does not waive confidentiality or privilege. If received in error, please notify the sender, delete this email, and make no further use, disclosure, or distribution.

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MJD 60000 Tonight Feb 25 Sat Midnight UTC
by Brian Inglis Feb. 24, 2023

Feb. 24, 2023

Hi folks, Tonight at midnight UTC it was 60k days since the MJD epoch 1858-11-17: 2023 Feb 25 Sat 00:00:00+0000 MJD 60000.000000 JD 2460000.500000 NTP 3886272000 Unix 1677283200 Windows 133217568000000000 No sign of anyone at SAO acknowledging the 65th year of its use since its definition to track Sputnik's orbit on an IBM 704 from 1957-10-04 to about 1958-01-04. -- Take care. Thanks, Brian Inglis Calgary, Alberta, Canada La perfection est atteinte Perfection is achieved non pas lorsqu'il n'y a plus rien à ajouter not when there is no more to add mais lorsqu'il n'y a plus rien à retirer but when there is no more to cut -- Antoine de Saint-Exupéry

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Charset for Digest Emails
by Owen Leibman Feb. 24, 2023

Feb. 24, 2023

I have been subscribed to the “tz digest”, which comes out about once a day. Whenever a non-ASCII character is part of the message, it is rendered as multiple question marks. This seems to be because the message is sent with a header: Content-Type: text/plain; charset="us-ascii" This is only a minor nuisance. However, as an experiment, I changed my subscription to receive the messages directly rather than in digest form. A message today used an emoji outside the ASCII range, and it was rendered exactly as intended. It came with the following header: Content-Type: text/plain; charset="UTF-8"; format=flowed Is there a setting that could/should be changed so that the digest is sent with the same header? This email and any files transmitted with it are confidential, proprietary and intended solely for the individual or entity to whom they are addressed. If you have received this email in error please delete it immediately.

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Austin Group POSIX TZ changes and Time Zone Taxonomy
by Brian Inglis Feb. 23, 2023

Feb. 23, 2023

Hi folks, Saw that the Austin Group is proposing to support *some* time zones in POSIX issue 8; see: https://www.austingroupbugs.net/view.php?id=1619 TZ=Area/Location Some of the zones could be categorized as they have proposed, but that uses terminology that I don't think we would approve of, leaves a lot of zones in the tzdb unsupported and unaddressed, and omits a whole reality which I have attempted to categorize in the attached. Perhaps some here would like to come up with better facts, names, terminology, and wording, and propose an update to the Austin Group, that better reflects what exists, and what they are meant to be standardizing? If they are going to standardize this, they should either do it properly, or drop it entirely, maintaining the status quo, as they are not going to be helping with their inaccurate terminology, and limited support! -- Take care. Thanks, Brian Inglis Calgary, Alberta, Canada La perfection est atteinte Perfection is achieved non pas lorsqu'il n'y a plus rien à ajouter not when there is no more to add mais lorsqu'il n'y a plus rien à retirer but when there is no more to cut -- Antoine de Saint-Exupéry

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Re: [tz] IANA compilation problem
by Paul Eggert Feb. 22, 2023

Feb. 22, 2023

On 1/26/23 20:08, Steven Shuriff wrote: > I am getting compilation errors with the tz code involving UINTMAX_MAX. > This is happening on Windows and on VMS. Both are using older compilers. > > Windows is getting: > zic.c(1317) : error C2065: 'UINTMAX_MAX' : undeclared identifier > zic.c(2358) : warning C4116: unnamed type definition in parentheses > > > VMS is getting: > uint_fast64_t unfair_min = - ((UINTMAX_MAX % base__6 + 1) % base__6); > .................................^ > %CC-E-UNDECLARED, In the initializer for unfair_min, "UINTMAX_MAX" is not declared. > at line number 1272 in file DEVVS1$DKA0:[COMMON_INGSRC.TREASURE.IANA.iana.tmp]zic.c;33 > Failed to build zic > > > Besides upgrading the compilers (not possible at this time) is there any possible solution? Sorry, I didn't see this private email until now. Please try the attached patch, which I installed into the development repository. It fixes a portability bug present since TZDB release 2022f. As mentioned in <https://mm.icann.org/pipermail/tz/2022-December/032399.html> I'm planning to phase out support for C89, as these old compilers are not much used nowadays and the cost of maintaining the ports to these compilers is starting to outweigh the benefit. In the next release if you still need support for old compilers the plan is that you'll need to compile with -DPORT_TO_C89 and/or -DSUPPORT_C99. This is intended to be a heads-up for builders on obsolete platforms.

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