April 2023 - tz - lists.iana.org

(no subject)
by Cool Gab19 Nov. 7, 2024

Nov. 7, 2024

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...

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Re: [tz] Time for a Lunar time zone? -Brooks
by Paul Eggert July 11, 2024

July 11, 2024

On 3/2/23 09:51, Brooks Harris wrote: > Will we need DST on the Moon? :-) I hope not! The Moon's axis tilts only 1.5°, much less than the 23.5° of Earth's axis, so seasonal effects on sunlight duration are much less intense on the Moon and there should be less need for Earth-like DST. A more pressing issue is that the length of day (including daytime and nighttime) varies more on the Moon. Local Earth days vary by at most 0.008 hours from the mean of 24 hours (this variation is due to the eccentricity of the Earth orbit and the obliquity of the ecliptic). So people who think that every local Earth day is exactly 24 hours are not far off. Local lunar days, in contrast, are roughly 29.5 ± 0.25 Earth days (again, this includes both lunar daytime and lunar nighttime). That's more slop to deal with, relatively speaking, and dealing with varying-length days could be a bit of a problem for civil time on the Moon. Presumably ESA's boffins are on top of this.....

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Did Greenland abolish daylight saving from 2024 on?
by Paul Eggert Nov. 20, 2023

Nov. 20, 2023

This week several English-language news sources reported that Greenland has moved its clocks forward for the last time. These reports disagree with current TZDB[1], which follows Thomas M. Steenholdt's December email[2] saying that although in November Greenlanders voted to not fall back this fall, they also voted to continue to observe daylight saving time (DST) next year, effectively moving their time zone one hour east instead of abolishing DST. There's no disagreement about timekeeping this year. The first point of disagreement is March 30, 2024 at 23:00, when TZDB says Nuuk, Greenland will spring forward to 24:00, whereas the recent news reports say clocks will neither spring forward nor fall back during 2024. So who's right: Steenholdt in December, or these several recent news reports? Currently TZDB goes with Steenholdt. After all, he cited the relevant Greenland legislation and his email address ends in ".gl". I suppose another possibility, though, is that Greenland's government has changed its mind since November. However, if so I'd like to see citations to the newer legislation. The earliest recent news story I found on this topic was a week ago by Lebawit Lily Girma[3], senior travel news reporter for Bloomberg Pursuits. I'm taking the liberty of bcc'ing Girma to see if she can help get to the bottom of the situation. [1]: https://iana.org/tz [2]: https://mm.icann.org/pipermail/tz/2022-December/032402.html [3]: Girma LL. Greenland Solves the Daylight Saving Time Debate. Bloomberg. 2023-03-24. https://www.bloomberg.com/news/articles/2023-03-24/greenland-keeps-daylight… Here are some of the other news reports I found. Greenland to stay in daylight saving time forever. AP. 2023-03-27. https://apnews.com/article/greenland-daylight-saving-summertime-utc-gmt-3b5… Martin M. Greenland is keeping daylight saving time permanently. NPR. 2023-03-28. https://www.wunc.org/2023-03-28/greenland-is-keeping-daylight-saving-time-p… Selcho M. Here’s why Greenland is permanently keeping daylight saving time. Deseret News. 2023-03-28. https://www.deseret.com/u-s-world/2023/3/28/23660379/why-greenland-keeping-… Jerusalem Post staff. Greenland changed their clocks to daylight savings for the last time. Jerusalem Post. 2023-03-29. https://www.jpost.com/international/article-735751 Carpineti A. Greenland Has Changed Its Clocks For The Last Time, Embracing Daylight Savings Forever. IFLScience. 2023-03-29. https://www.iflscience.com/greenland-has-changed-its-clocks-for-the-last-ti…

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Danish standard time will probably officially be based on UTC
by Jonas Nyrup Sept. 9, 2023

Sept. 9, 2023

Since 1893-03-29 Danish standard time has been defined as "the mean solar time for the 15th degree of longitude east of Greenwich" (machine translated of the offical law). With the introduction of UTC we didn't update that law, but we did start using UTC+1 as standard time in practice. So for around 50 years maybe only astronomers have been following the law. The Minister of Transportation has now proposed a bill to update the law to define Danish standard time as UTC+1 to keep up with reality. At the first reading all political parties expressed their support and jokingly noted that "it was about time". The updated law is expected to take effect on 2023-03-26. The current law: https://www.retsinformation.dk/eli/lta/1893/83 The bill: https://www.ft.dk/samling/20222/lovforslag/l19/index.htm Tom Scott on the subject: https://www.youtube.com/watch?v=yRz-Dl60Lfc Jonas Nyrup

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Buggy %z behaviour in strftime
by Almaz Mingaleev May 16, 2023

May 16, 2023

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?

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Introduce Etc/UTC+x timezones?
by Benjamin Drung May 4, 2023

May 4, 2023

Hi, If people are aware of timezones, they often know UTC and their offsets (e.g. Europe/Berlin is UTC+2 summer). But they are probably not aware that the Etc/GMT offsets are inverted (e.g. you have to select Etc/GMT-2 for UTC+2). I was not aware of that and other people as well as the bugs in Ubuntu and Debian indicate (see https://launchpad.net/bugs/1325949 and https://bugs.debian.org/540305) What do you think about the idea of introducing Etc/UTC+x timezones that have the "correct" offset so that people can select fixed offsets more easily? So Etc/GMT-2 would be renamed to Etc/UTC+2 and Etc/GMT-2 would become a symlink to it (same for all other Etc/GMT+x and Etc/GMT-x timezones). -- Benjamin Drung Debian & Ubuntu Developer

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offtime_r
by Dag-Erling Smørgrav April 26, 2023

April 26, 2023

The tzcode distribution includes a (non-standard and undocumented) offtime() function but no offtime_r() function, which seems like an oversight. The attached patch (relative to 2023c) adds it. Regards, Dag-Erling

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Change Chile/Santiago DST
by Antonio Afranio Barbosa Martins April 26, 2023

April 26, 2023

Hi there, There is a issue with Daylight Saving Time (DST) for Chile/Santiago (South America). Based on some sites like https://www.timeanddate.com/time/zone/chile/santiago and https://www.bcn.cl/leychile/navegar?i=1179983&f=2022-08-13 (oficial Chile resolution) Correct time: Year Daily Time Change 2022 Sun, 3 Apr, 00:00 -1 hour (DST end) Sun, 11 Sep, 00:00 +1 hour (DST start) 2023 Sun, 2 Apr, 00:00 -1 hour (DST end) Sun, 3 Sep, 00:00 +1 hour (DST start) 2024 Sun, 7 Apr, 00:00 -1 hour (DST end) Sun, 8 Sep, 00:00 +1 hour (DST start) 2025 Sun, 6 Apr, 00:00 -1 hour (DST end) Sun, 7 Sep, 00:00 +1 hour (DST start) 2026 Sun, 5 Apr, 00:00 -1 hour (DST end) Sun, 6 Sep, 00:00 +1 hour (DST start) Descarga de Responsabilidad: Este mensaje contiene información confidencial y esta dirigido solamente al remitente especificado. Si usted no es el destinatario no debe tener acceso, distribuir ni copiar este e-mail. Notifique por favor al remitente inmediatamente si usted ha recibido este mensaje por error y eliminelo de su sistema. La transmisión del e-mail no se puede garantizar que sea segura, sin errores o como que la información podría ser interceptada, alterada, perdida, destruida, llegar atrasado, incompleto o contener virus, por lo tanto el remitente no acepta la responsabilidad por ningunos de los errores u omisiones en el contenido de este mensaje, que se presentan como resultado de la transmisión del e-mail. Si la verificación se requiere, por favor solicite una versión impresa. Disclaimer: This message contains confidential information and is intended only for recipient specified. If you are not recipient you should not disseminate, distribute or copy this e-mail. Please notify to sender immediately if you have received this message by mistake and delete this from your system. E-mail transmission cannot be guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or contain viruses. The receptor therefore does not accept liability for any errors or omissions in the contents of this message, which arise as a result of e-mail transmission. If verification is required, please request a hard-copy version.

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Comments
by Arthur David Olson April 23, 2023

April 23, 2023

Fun fact: the time zone database is 80% comments by volume. @dashdashado

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Mexico timezones
by Var Nazari April 10, 2023

April 10, 2023

Hello, Mexico has recently abolished daylight savings except for where they border with the United States. I believe the timezone database is now inaccurate because it should not be showing CDT for most of the country any longer and should be CST instead. It seems like this was addressed in release notes for the tzdb version 2022f and 2022g but I'm not sure that the correct changes were applied. Could you verify/explain why the timezones in Mexico are still recorded as CDT? Is this a mistake? Thank you

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