December 2024 - tz - lists.iana.org

Chile's Aysén Region polled about switching from -04/-03 to -03 all year
by Paul Eggert March 20, 2025

March 20, 2025

Beginning this week and continuing through the end of the month, the citizens of Chile's Aysén Region are being polled virtually for a non-binding resolution[1] to switch from the their current timekeeping regime TZ="America/Santiago" (-04 in winter, -03 in summer) to permanent -03 (like TZ="America/Punta_Arenas"). If this happens, we'll need to create a new Zone America/Coyhaique to record the change, which would likely have practical effect on 2025-04-05 at the earliest. Unfortunately, the SurveyMonkey form used for the poll requires no authentication, which raised plausible worries this week about ballot-stuffing[2]. [1]: https://www.diarioregionalaysen.cl/noticia/actualidad/2024/11/lanzan-consul… [2]: https://www.diarioregionalaysen.cl/noticia/actualidad/2024/11/encuesta-sobr…

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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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Paraguay may adopt permanent DST soon
by Heitor David Pinto Jan. 13, 2025

Jan. 13, 2025

Today the Congress of Paraguay passed a bill to observe UTC-3 permanently, equivalent to permanent DST. The bill still needs to be approved by the president. https://www.abc.com.py/politica/2024/09/24/congreso-sanciona-horario-de-ver… The text of the bill says that it would enter into force on the first Sunday in October 2024, the same date currently scheduled to start DST. But in practice, it would only make a difference from the fourth Sunday of March 2025, the date currently scheduled to end DST. https://silpy.congreso.gov.py/web/expediente/132531

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Y2K on the radio
by Arthur Olson Dec. 31, 2024

Dec. 31, 2024

With a New Year looming, an NPR Y2K review. (Alas, no mention of T2G in 2038.) @dashdashado https://www.npr.org/2024/12/28/nx-s1-5116271/y2k-year-2000-preparations

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[PROPOSED] For timestamps compare to HEAD not to index
by Paul Eggert Dec. 30, 2024

Dec. 30, 2024

Problem reported by Bruno Haible in: https://lists.gnu.org/r/bug-gnulib/2024-12/msg00245.html * Makefile (set-timestamps.out): When comparing working file to repository, Use ‘git diff HEAD’ instead of plain ‘git diff’. --- Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Makefile b/Makefile index ffdbfe3b..e00b0f32 100644 --- a/Makefile +++ b/Makefile @@ -1104,7 +1104,7 @@ set-timestamps.out: $(EIGHT_YARDS) touch -md @1 test.out; then \ rm -f test.out && \ for file in $$files; do \ - if git diff --quiet $$file; then \ + if git diff --quiet HEAD $$file; then \ time=$$(TZ=UTC0 git log -1 \ --format='tformat:%cd' \ --date='format:%Y-%m-%dT%H:%M:%SZ' \ -- 2.47.1

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Deprecate two digit year formats %D %g %y
by Brian Inglis Dec. 29, 2024

Dec. 29, 2024

Hi folks, [Spurred by NPR Y2K review article.] Could we please all make a New Year's resolution to stop people from reviving two digit year formats that are starting to reappear, making it impossible to figure out some intended dates, and officially deprecate all two digit year formats %D %g %y across all standards, and tools default to options like gcc's and clang's -Wformat-y2k (included in -Wformat=2) and clang's -Wdeprecate. -- 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 inclusion of Trivandrum in the IANA Time Zone Database
by Anish shivaraj Dec. 28, 2024

Dec. 28, 2024

Dear tzdata Maintainers, I am writing to propose the inclusion of Trivandrum (Thiruvananthapuram) as a new entry in the IANA Time Zone Database (tzdata). As the capital city of Kerala, Trivandrum holds significant historical, economic, and technological importance, and its addition to the database would reflect its growing prominence. Justification for Inclusion Population and Prominence With a population exceeding 1 million, Trivandrum is well above the 300,000 threshold for inclusion.The city serves as a political, cultural, and economic hub in southern India. Economic Growth and Commercial Significance Vizhinjam International Seaport: Trivandrum is home to India’s first transshipment port, the Vizhinjam International Seaport, which is expected to position the city as a major player in global shipping and logistics. Emerging Commercial Hub: The growth of the Vizhinjam port has already made Trivandrum an important center for commerce, attractingsignificant investments and fostering local economic development. Technological and Space Research Importance India’s First IT Park: Technopark in Trivandrum is the country’s first and one of the largest IT parks, contributing greatly to India’s IT industry. Space Research and Education: The city houses the Vikram Sarabhai Space Centre (VSSC), a key institution for India’s space exploration efforts. Trivandrum also hosts the Indian Institute of Space Science and Technology (IIST) and the Kerala Space Park, making it a critical hub for space research and innovation. Eligibility Based on Time Zone Criteria Unique Timekeeping History: Trivandrum once had its own local mean time before the adoption of Indian Standard Time (IST), making this distinction relevant for its case. Representative Need: As an emerging commercial, technological,and research center, a separate time zone entry would provide better representation for the region’s users and applications. Alignment with tzdata Objectives - Trivandrum meets the criteria of significant population, historical relevance, and global contributions to shipping, IT, and space research, making it a suitable candidate for inclusion. Proposed Time Zone Entry We suggest adding the following entry: Zone Asia/Trivandrum +05:30 - Trivandrum Standard Time Including Trivandrum in the tzdata database would provide better localization and reflect its growing importance. Thank you for considering this request. Should you require further information or clarification, please do not hesitate to reach out. Best regards, Anish Sivarajan

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Re: Iana build failures on Windows
by Paul Eggert Dec. 19, 2024

Dec. 19, 2024

On 2024-12-17 07:53, Manuela Friedrich wrote: > It's worth noticing that I had to add -DHAVE_SYS_STAT_H=0 to the tools.ini > file we use on Windows. Thanks for mentioning that, but unfortunately I don't know why -DHAVE_SYS_STAT_H=0 was needed (I don't use MS-Windows). Some fumbling with Microsoft documentation eventually led me to <https://learn.microsoft.com/en-us/cpp/c-runtime-library/compatibility?view=…> which hints (but does not say) that by default MS-Windows <sys/stat.h> doesn't define the 'stat' function if you use some compilation options. I installed the attached patch to try to work around this portability problem. Does this patch fix things so that -DHAVE_SYS_STAT_H=0 need not be added to tools.ini? If not, what problems do you observe? With the patch, do you see warnings when compiling? Does compiling with -D_CRT_SECURE_NO_WARNINGS cut down on the number of warnings? What's in your tools.ini file for building tzcode?

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Re: Iana build failures on Windows
by Paul Eggert Dec. 17, 2024

Dec. 17, 2024

On 2024-12-15 23:11, Manuela Friedrich wrote: > localtime.c > d:\devsrc\treasure_test\iana\tmp\private.h(872): warning C4005: 'max': > macro redefinition > C:\Program Files (x86)\Windows > Kits\10\include\10.0.16299.0\ucrt\stdlib.h(1300): note: see previous > definition of 'max' > d:\devsrc\treasure_test\iana\tmp\private.h(873): warning C4005: 'min': > macro redefinition > C:\Program Files (x86)\Windows > Kits\10\include\10.0.16299.0\ucrt\stdlib.h(1301): note: see previous > definition of 'min' > localtime.c(418): error C2065: 'utc': undeclared identifier > localtime.c(418): warning C4047: ':': 'const char *' differs in levels of > indirection from 'int' > localtime.c(1449): error C2065: 'utc': undeclared identifier > localtime.c(1449): warning C4047: 'function': 'const char *' differs in > levels of indirection from 'int' > localtime.c(1449): warning C4024: 'strcpy': different types for formal and > actual parameter 2 > NMAKE : U1077: '"C:\Program Files (x86)\Microsoft Visual > Studio\2017\Professional\VC\Tools\MSVC\14.12.25827\bin\HostX64\x64\cl.EXE"' > : return code '0x2' Thanks for reporting these build glitches on MS-Windows. I installed the attached patches; please give them a try, as I don't use that platform.

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Daylight Saving in the news
by Arthur Olson Dec. 15, 2024

Dec. 15, 2024

"Trump vows to end 'very costly' daylight saving time" (While Mexico may not pay for it, Mexico and Canada may follow suit.) https://www.bbc.com/news/articles/cn9gjvgv4neo @dashdashado

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