July 2024 - tz - lists.iana.org

localized date without time
by Alejandro Colomar Feb. 12, 2025

Feb. 12, 2025

Hi Paul, Link: <https://github.com/shadow-maint/shadow/issues/1057> Currently, shadow utils' passwd(1) (and several other programs) uses UTC time when printing. That is: $ passwd -S alx alx P 2023-09-20 0 99999 7 -1 the date from above is a UTC representation of $ sudo cat /etc/shadow | grep alx | cut -f3 -d: 19620 However, shadow utils programs, such as chage(1), use local time in input. That timestamp was set by chage(1), interpreting a local date: $ sudo chage -d 2023-09-21 alx $ sudo cat /etc/shadow | grep alx | cut -f3 -d: 19620 $ date Wed Jul 31 07:54:17 CEST 2024 This is rather confusing, and we think that passwd(1) should also print the date in local time, when printing human-readable dates. However, I think it might be better to show the timezone information together with the date, to be clear that what we're printing is local time. Do you think that's reasonable? Or maybe it's understood that when printing a date some timezone information is implicitly local? I didn't find any way to print timezone information in ISO 8601, if you don't print the time together with the date. That is, ISO 8601 says: C.1.3.1 Date A date string represents one of the following: • year, month, and day (e.g. 2001-02-03) • year and month (e.g. 2008-12 ) • year (e.g. 2008) and C.1.3.2 Date and Time A date/time string is composed according to one of three representations as illustrated in the following three examples: • 2001-02-03T09:30:01 • 2004-01-01T10:10:10Z • 2004-01-01T10:10:10+05:00 but I don't see any way to print something like 2023-09-21+02:00 in standardese. Is this a defect in ISO 8691? I see that in C.1.3.2, it says "Zone-offset may be omitted or included", so I guess we can just omit it. What do you think we should do? Thanks! And have a lovely day! Alex -- <https://www.alejandro-colomar.es/>

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(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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Ukraine to abolish DST?
by Steffen Thorsen Oct. 26, 2024

Oct. 26, 2024

Ukraine seems to be getting rid of DST, according to https://universemagazine.com/en/the-verkhovna-rada-canceled-daylight-saving… "During a meeting of the Verkhovna Rada of Ukraine on June 16, daylight saving time was canceled. According to MP Yaroslav Zheleznyak, 261 MPs voted in favor of the bill. Now it must be signed by the President of Ukraine, and then it will come into force." which is again referencing (in Ukrainan) https://lb.ua/society/2024/07/16/624453_verhovna_rada_skasuvala_perehid.html It seems they will plan to set back time this autumn to winter(standard) time, and then stay on that. Best regards, Steffen Thorsen - timeanddate.com

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Fwd: Bulletin C number 68
by Tim Parenti July 29, 2024

July 29, 2024

No leap second 2024-12-31, per below. See attached patch. -- Tim Parenti ---------- Forwarded message --------- From: IERS EOP Product Center <iers.eoppc(a)obspm.fr> Date: Thu, 4 Jul 2024 at 10:57 Subject: Bulletin C number 68 To: <bulc.iers(a)obspm.fr> INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS) SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE SERVICE DE LA ROTATION TERRESTRE DE L'IERS OBSERVATOIRE DE PARIS 61, Av. de l'Observatoire 75014 PARIS (France) Tel. : +33 1 40 51 23 35 e-mail : services.iers(a)obspm.fr http://hpiers.obspm.fr/eop-pc Paris, 04 July 2024 Bulletin C 68 To authorities responsible for the measurement and distribution of time INFORMATION ON UTC - TAI NO leap second will be introduced at the end of December 2024. The difference between Coordinated Universal Time UTC and the International Atomic Time TAI is : from 2017 January 1, 0h UTC, until further notice : UTC-TAI = -37 s Leap seconds can be introduced in UTC at the end of the months of December or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every six months, either to announce a time step in UTC, or to confirm that there will be no time step at the next possible date. Christian BIZOUARD Director Earth Orientation Center of IERS Observatoire de Paris, France

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Parts of Georgia and Ukraine observing Moscow time
by Heitor David Pinto July 22, 2024

July 22, 2024

Hello, Sources indicate that Abkhazia has observed Moscow time since at least 2010:https://web.archive.org/web/20100725215624/http://abkhazia.travel:80/a… It's possible that South Ossetia has done the same. Both regions definitely changed to UTC+3 along with Moscow in 2014, and have remained in that time zone since then:https://www.kavkaz-uzel.eu/articles/251354/ In Ukraine, the portions of Donetsk and Luhansk regions administered by separatists have observed Moscow time since 2014:https://tass.com/world/756540 In 2022, the portions of Donetsk, Luhansk, Zaporizhzhia and Kherson regions administered by Russia also changed to Moscow time:https://tass.com/society/1568025https://tass.com/society/1605439 I understand that these changes are controversial, but the database does show Crimea in Moscow time since 2014, even though it remains under country code UA in file zone.tab. So I suppose that these other regions should be added as well, under codes GE and UA but showing their time zones observed in practice. Regards,David

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Ukraine canceled DST in autumn of 2024
by Yuriy Novostavskiy July 17, 2024

July 17, 2024

Parlament of Ukraine decided to cancel introducing DST, so, starting from spring 2025 DST will not be used for Kyiv time zone. That law was proposed in 2020, and accepted July 17, 2024. Info on the parlament site of Ukraine https:// w1.c1.rada.gov.ua/pls/zweb2/webproc4_1?pf3511=70150 BTW, that decision should be finally approved by President that is not happened yet

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Contributions of core, mantle and climatological processes to Earth’s polar motion
by Brooks Harris July 15, 2024

July 15, 2024

Contributions of core, mantle and climatological processes to Earth’s polar motion https://www.nature.com/articles/s41561-024-01478-2

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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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Earth's inner core has slowed so much it's moving backward
by Brian Inglis July 5, 2024

July 5, 2024

Newer info related to leap second distribution and occurrences. Earth’s core has slowed so much it’s moving backward, scientists confirm: https://www.cnn.com/2024/07/05/science/earth-inner-core-rotation-slowdown-c… Inner core backtracking by seismic waveform change reversals: https://www.nature.com/articles/s41586-024-07536-4 TL;DR: Seismologists confirm ~70 year inner core oscillation cycle. Inner core rotated eastward faster than the planet 2003-2008 and back ~ 2.5* more slowly westward 2008-2023 over the same path relative to the mantle. Mantle density anomalies and mantle and core boundary topography gravitational coupling could explain LoD Length of Day SYO 6 Year Oscillation. Slower core spin, speeds up the mantle, the planet rotates faster, and the LoD shortens by ms. Core rotation should speed up again in 5-10 years if model is confirmed. -- 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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Request for Change of Time Zone Name from Asia/Ho_Chi_Minh to Asia/Ha_Noi
by viet le July 4, 2024

July 4, 2024

Dear Sir/Madam, I am writing to formally request a change in the naming of the time zone for Viet Nam in your database. Currently, the time zone is listed as "Asia/Ho_Chi_Minh." However, I would like to propose that this be updated to "Asia/Ha_Noi" to reflect the official and more widely recognized name of the time zone. Hà Nội, as the capital city of Viet Nam, is the administrative and political center of the country. It holds significant historical, cultural, and socio-economic importance. Consequently, using Hà Nội as the reference point for the country's time zone would be more appropriate and align with international standards and practices. The change from "Asia/Ho_Chi_Minh" to "Asia/Ha_Noi" would not only reflect the official naming conventions but also aid in reducing confusion among users and developers who rely on accurate and standardized time zone data. This adjustment would bring consistency and clarity to the representation of Viet Nam's time zone in global systems. I kindly ask that IANA consider this request and take the necessary steps to implement the change. Your attention to this matter and efforts to ensure accurate representation in the time zone database are greatly appreciated. Thank you for your time and consideration. I look forward to your favorable response. Sincerely, Viet Le

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