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Re: Ukraine to abolish DST?
by Yuriy Novostavskiy Aug. 16, 2024

Aug. 16, 2024

+ CC On Fri, Aug 16, 2024 at 6:19 PM Yuriy Novostavskiy <yuriy(a)novostavskiy.kiev.ua> wrote: > > Hi Paul, > > This small update is just a heartbeat that has no updates so far, but > it's on my eye and I will update you when something changes. > > To fully clarify what the current status is and the expected next steps: > Parliament voted for https://itd.rada.gov.ua/billInfo/Bills/Card/4294 > and document reached required amount of votes, but to become a bill > this document should be signed by the President has not happened yet, > moreover, it has not even been signed by the Chairman of the Parlament > which is just a bureaucracy formality, but without that step, the > document will not be given to President for signature.It's quite an > unusual delay in the processing of bills. The whole story of that > document is quite long, it appeared back in 2020 and was just added to > the vote list in 2024. > > Another document that you mentioned > https://itd.rada.gov.ua/billInfo/Bills/Card/44572, it's a project of > the decision to reject the first one, but it's not even planned to > vote in the Parlament. > > So, stay tuned. > > On Thu, Jul 18, 2024 at 11:09 AM Yuriy Novostavskiy > <yuriy(a)novostavskiy.kiev.ua> wrote: > > > > I assumed that changes would technically take affects on March 30, > > 2025, when DST will not be introduced. Anyway, I propose to keep those > > changes in "work in progress" status until a new law is finally signed > > and published, and in the final text will have clear understanding of > > 'de jure' cut-off date. > > > > I will keep it tracked and will inform you. > > > > BR/Yurii > > > > On Wed, Jul 17, 2024 at 10:20 PM Paul Eggert <eggert(a)cs.ucla.edu> wrote: > > > > > > Thanks for the heads-up about the bill. I found a copy on the Rada > > > website[1]. Assuming the president signs it and it becomes law, we'll > > > need a change and a new TZDB release. > > > > > > The bill says that the law would take effect three months after > > > promulgation, so it'd be helpful to find out its promulgation date > > > whenever that happens to be. > > > > > > A further proposed resolution was introduced today[2] to annul > > > yesterday's decision and stick with the status quo, on the grounds that > > > yesterday's decision wasn't properly conducted. Not knowing Ukrainian > > > politics, I don't know how today's proposal will affect matters. > > > > > > I am attaching a draft TZDB patch but I haven't installed it into the > > > development version, because the effective date isn't known (I > > > approximated it as "2025" in the draft patch), the bill as it stands > > > might not become law, and the patch will need commentary. The > > > zonenow.tab part of the draft patch would be temporary and that file > > > would need to be updated further after 2024-10-27 as Ukraine would merge > > > with Libya and Kaliningrad for future timestamps. > > > > > > [1]: https://itd.rada.gov.ua/billInfo/Bills/Card/4294 > > > [2]: https://itd.rada.gov.ua/billInfo/Bills/Card/44572

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netherland timezone UTC offset (0:19:32.13) history
by Eitan Adler Aug. 6, 2024

Aug. 6, 2024

(I am not currently subscribed, please keep me CCed) Hi all, I'm interested in some specific timezone history. Specifically I'm curious about the origin of 'STDOFF 0:19:32.13'. Does anyone have an authoritative source for where this is derived from? Below is what I found so far: 1. In "NEWS" there is this entry: === zic now accepts subsecond precision in expressions like 00:19:32.13, which is approximately the legal time of the Netherlands from 1835 to 1937... === 2. Wikipedia here https://en.wikipedia.org/wiki/UTC%2B00:20 says === The reason for the specific offset of +0h 19m 32.13s was that the time zone was centered on the mean solar time of the Westertoren (4° 53' 01.95" E Longitude), the tower of the Westerkerk church in Amsterdam. === but I can't find any reference to this specific offset in any of the sources listed on Wikipedia. It is possible I missed the reference though. https://articles.adsabs.harvard.edu/pdf/1909Obs....32..297. https://books.google.com/books?id=MbA-AQAAIAAJ&pg=PA75&printsec=frontcover&… 3. I've seen several references that cite *to* wikipedia or tzdata, but I haven't been able to find anything older. (if this is off topic for the mailing list I apologize, this is the best place I could find) -- Eitan Adler

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[PROPOSED] Mention Internet RFC 9557
by Paul Eggert July 31, 2024

July 31, 2024

--- theory.html | 5 +++++ tz-link.html | 20 ++++++++++++-------- 2 files changed, 17 insertions(+), 8 deletions(-) diff --git a/theory.html b/theory.html index 10281af1..d3573ede 100644 --- a/theory.html +++ b/theory.html @@ -581,6 +581,11 @@ in decreasing order of importance: some sense undefined; this notation is derived from <a href="https://datatracker.ietf.org/doc/html/rfc3339">Internet <abbr title="Request For Comments">RFC</abbr> 3339</a>. + (The abbreviation 'Z' that + <a href="https://datatracker.ietf.org/doc/html/rfc9557">Internet + <abbr>RFC</abbr> 9557</a> uses for this concept + would violate the POSIX requirement + of at least three characters in an abbreviation.) </li> </ul> diff --git a/tz-link.html b/tz-link.html index 739d07af..4d883883 100644 --- a/tz-link.html +++ b/tz-link.html @@ -193,9 +193,10 @@ After obtaining the code and data files, see the <code>README</code> file for what to do next. The code lets you compile the <code><abbr>tz</abbr></code> source files into machine-readable binary files, one for each location. The binary files -are in a special timezone information format (<dfn><abbr>TZif</abbr></dfn>) -specified by <a href="https://datatracker.ietf.org/doc/html/8536">Internet -<abbr>RFC</abbr> 8536</a>. +are in a special format specified by +<a href="https://datatracker.ietf.org/doc/html/8536">The +Time Zone Information Format (<abbr>TZif</abbr>)</a> +(Internet <abbr title="Request For Comments">RFC</abbr> 8536). The code also lets you read a <abbr>TZif</abbr> file and interpret timestamps for that location.</p> @@ -262,8 +263,8 @@ Studio Code</a>. <p> For further information about updates, please see <a href="https://datatracker.ietf.org/doc/html/rfc6557">Procedures for -Maintaining the Time Zone Database</a> (Internet <abbr -title="Request For Comments">RFC</abbr> 6557). More detail can be +Maintaining the Time Zone Database</a> (Internet <abbr>RFC</abbr> 6557). +More detail can be found in <a href="theory.html">Theory and pragmatics of the <code><abbr>tz</abbr></code> code and data</a>. <a href="https://a0.github.io/a0-tzmigration/">A0 TimeZone Migration</a> @@ -1174,9 +1175,12 @@ headers.</li> <li> <a href="https://datatracker.ietf.org/doc/html/rfc3339">Date and Time on the Internet: Timestamps</a> (Internet <abbr>RFC</abbr> 3339) -specifies an <abbr>ISO</abbr> 8601 -profile for use in new Internet -protocols.</li> +specifies an <abbr>ISO</abbr> 8601 profile for use in new Internet protocols. +An extension, <a href="https://datatracker.ietf.org/doc/html/rfc9557">Date +and Time on the Internet: Timestamps with Additional Information</a> +(Internet <abbr>RFC</abbr> 9557) extends this profile +to let you specify the <code><abbr>tzdb</abbr></code> timezone of a timestamp +via suffixes like "<code>[Asia/Tokyo]</code>". <li> <a href="https://web.archive.org/web/20190130042457/https://www.hackcraft.net/web/da…">Date & Time Formats on the Web</a> surveys web- and Internet-oriented date and time -- 2.43.0

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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 3, 2024

July 3, 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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