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eggert/tz

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Time zone database and code

46 mentions on Hacker News by 38 people: 3 stories, 43 comments · first 2014-02-21 · latest 2026-10-29

Mentions per year 46 mentions · busiest year 2026 (9)
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  1. The diff is 23 lines long, the vast majority of which is documentation: https://github.com/eggert/tz/commit/5b5b39dae16f787740b8c0d4...
    comment by murderfs · 2026-10-29 · in Cuba is skipping its November 1, 2026 clock change and staying on DST until 2027
  2. They're all over it before we hear about it: 3 days ago: https://github.com/eggert/tz/commit/5b5b39dae16f787740b8c0d4... It's not even the latest change to the library!
    comment by xnorswap · 2026-10-29 · in Cuba is skipping its November 1, 2026 clock change and staying on DST until 2027
  3. …-- Robertson Davies, The diary of Samuel Marchbanks, Clarke, Irwin (1947), XIX, Sunday * https://github.com/eggert/tz/blob/main/northamerica#L75
    comment by throw0101d · 2026-07-15 · in US House of Representatives takes step to make daylight saving time permanent
  4. …fall, but IANA TZ database still hasn't made the update because of the uncertainty. IANA revert: https://github.com/eggert/tz/commit/afcea8761543ac97aeee6399... https://www.cbc.ca/news/canada/british-columbia/what-time-is...
    comment by kelseydh · 2026-06-23 · in British Columbia, Time Zones, and Postgres
  5. …dates and times too! Morocco has some complex logic around Ramadan... which is a moveable festival. https://github.com/eggert/tz/blob/main/africa#L854 Rule Morocco 2026 only - Feb 15 3:00 -1:00 - Rule Morocco 2026 only - Mar 22 2:00 0 -…
    comment by shagie · 2026-03-08 · in The surprising whimsy of the Time Zone Database
  6. …a man who made his own: https://archive.aramcoworld.com/issue/196902/dinner.at.when.... Linked from https://github.com/eggert/tz/blob/main/asia#L3818
    comment by netsharc · 2026-03-08 · in The surprising whimsy of the Time Zone Database
  7. …fiat to change the timezone for a political enclave within another one that doesn't have a TLD. ( https://github.com/eggert/tz/blob/main/northamerica#L821 ) This also describes the compromises in the design of the system to accurately…
    comment by shagie · 2026-03-08 · in The surprising whimsy of the Time Zone Database
  8. ▲ 3
    IANA tz (and POSIX) cannot add British Columbia's new Pacific Time (PT) timezone
    story by kelseydh · 2026-03-04 · 1 comment
  9. …nice in today's world. --- This is also kind of what happens in China (with a complicated history). https://github.com/eggert/tz/blob/main/asia#L272 https://en.wikipedia.org/wiki/Time_in_China UTC+08:00 is observed throughout the country…
    comment by shagie · 2026-03-02 · in British Columbia is permanently adopting daylight time
  10. This change https://github.com/eggert/tz/commit/baea52df7ac9c4b53857556f... was a huge pain in my ass in 2013. I was working in Libya on voter registration tools with the UN and the High National Election Commission. The government decided…
    comment by jlev · 2025-09-11 · in How the tz database works (2020)
  11. I've found the comments in the database files (e.g. North America https://github.com/eggert/tz/blob/main/northamerica ) to be an interesting documentation of the history of the definition of time for various areas. For example, Indiana…
    comment by shagie · 2025-09-11 · in How the tz database works (2020)
  12. …of Friday 19th of Aban (=1978-11-10), # the country's time will be pulled back half an hour. From https://github.com/eggert/tz/blob/main/asia#L1503 . Pretty sure we can find a lot more oddities that are way worse.
    comment by johnisgood · 2025-06-25 · in How to Think About Time in Programming
  13. …NewNewYork by edict of some new global despot, the IANA will just alias the two names together. See https://github.com/eggert/tz/blob/main/backward for all the deprecated zones.
    comment by jitl · 2025-01-31 · in JavaScript Temporal is coming
  14. …[3] https://lists.iana.org/hyperkitty/list/tz@iana.org/thread/DS... https://github.com/eggert/tz/commit/bb203f1bb0b6cd4bb2b08f25... https://github.com/eggert/tz/blob/bb203f1bb0b6cd4bb2b08f2560...
    comment by JW_00000 · 2025-01-30 · in JavaScript Temporal is coming
  15. …it refuses to calculate timezone transitions occurring before the Big Bang. The commit message at https://github.com/eggert/tz/commit/b22d459a367f4d01b10f6f6b... says: > For example, Glib computes Sao Paulo time stamps as if Brazil's…
    comment by kccqzy · 2024-10-30 · in Australia/Lord_Howe is the weirdest timezone
  16. …of comments about the Europe/Dublin time zone in the europe file, including one quote from Ulysses: https://github.com/eggert/tz/blob/7748036bace8562b9c047f368c...
    comment by extraduder_ire · 2024-10-30 · in Australia/Lord_Howe is the weirdest timezone
  17. I think the old Riyadh timezone is the weirdest personally https://github.com/eggert/tz/blob/be62d5918223b4df209cc94163...
    comment by __alexs · 2024-10-30 · in Australia/Lord_Howe is the weirdest timezone
  18. Time Zone Database https://github.com/eggert/tz/graphs/contributors https://en.wikipedia.org/wiki/Tz_database
    comment by teeceepee · 2024-09-09 · in Which open-source projects are widely used but maintained by just a few people?
  19. It wasn't! See https://github.com/eggert/tz/blob/main/asia
    comment by madcaptenor · 2024-08-21 · in The Discovery of the Celendrical Date Line
  20. Timezones are political and economic statements (and sometimes even religious - https://github.com/eggert/tz/blob/main/africa#L853 ). Things like China being all one timezone or India changing to IST after declaring independence…
    comment by shagie · 2024-07-03 · in All I want for Christmas is a negative leap second
  21. …it's capable of handling UTC offsets at least to a second level, if not fractional seconds. [0] https://github.com/eggert/tz
    comment by hermitdev · 2024-06-03 · in Will we have a negative leap second? [pdf] (2022)
  22. …that doesn't exclude that file will simply treat the old name as an alias for the new name. [0] https://github.com/eggert/tz/commit/e13e9c531fc48a04fb8d064a...
    comment by LegionMammal978 · 2023-08-31 · in RFC 3339 vs. ISO 8601
  23. …but Ireland technically does it the other way around -- a distinction relevant only to computers. https://github.com/eggert/tz/blob/c3e966c59b02b1f47f0b7b0e4a... The only other timezone that currently has a non-1h offset for DST --…
    comment by ucarion · 2023-08-14 · in Navigating the timezone nightmare in product development
  24. I see 3 countries with negative DST in their RULE records: * Eire after 1971: https://github.com/eggert/tz/blob/main/europe#L526 * Morocco after 2019: https://github.com/eggert/tz/blob/main/africa#L928 * Namibia between 1994 and 2017:…
    comment by bxparks · 2023-03-26 · in systemd 100% cpu hang? – Proxmox Support Forum
  25. …including a note about how clocks lost 6 minutes a day because PG&E changed AC from 60 to 59.5 Hz: https://github.com/eggert/tz/blob/71faa2a55db2c9f21f4099b58c...
    comment by mjrpes · 2023-03-26 · in systemd 100% cpu hang? – Proxmox Support Forum
  26. Here's the tzdata: https://github.com/eggert/tz/blob/71faa2a55db2c9f21f4099b58c... Looks like the negative DST has already caused problems in the past and applications that can't handle it (ICU & OpenJDK) have to build tzdata as per the…
    comment by dTP90pN · 2023-03-26 · in systemd 100% cpu hang? – Proxmox Support Forum
  27. It looks like this is tracked as "Australia/Eucla" in the IANA TZ database: https://github.com/eggert/tz/blob/main/australasia#L30 You can type the following to see the current time there: $ TZ=Australia/Eucla date Thu Oct 27 10:36:45…
    comment by bxparks · 2022-10-27 · in Australia's weird little time zone (2008)
  28. …I think you'll find a great many systems already have a way of distributing DST rule updates. [1] https://github.com/eggert/tz/blob/main/europe#L4014
    comment by michaelt · 2022-03-15 · in US Senate votes unanimously to make daylight savings time permanent
  29. And no entry in the timezone database :-( https://github.com/eggert/tz/search?q=athos But then if they have no computers, maybe that doesn't matter.
    comment by rwmj · 2021-12-10 · in Mount Athos, the “Autonomous Monastic State” of Greece (2016)
  30. …the rest of the world, but in S. Arabia it was once common to set your watch to 6 am at sunrise: https://github.com/eggert/tz/blob/43dbb43381487a253fdc4462c0...
    comment by bellyfullofbac · 2021-10-20 · in The tight-knit time zone data maintenance community
  31. …comments within. There is quite a bit of detailed commentary and sourcing for the actual offsets. https://github.com/eggert/tz/blob/43dbb43381487a253fdc4462c0... for Mauritius is representative
    comment by TAForObvReasons · 2021-10-20 · in The tight-knit time zone data maintenance community
  32. Searching for Ramadan in https://github.com/eggert/tz/blob/main/asia and https://github.com/eggert/tz/blob/main/africa is an interesting read. Morocco textual history is at https://github.com/eggert/tz/blob/main/africa#L628 and the…
    comment by shagie · 2021-09-23 · in Samoa Scraps Daylight Saving Time
  33. …in the tz DB is a little window into the questionable cultural achievement that is local time: https://github.com/eggert/tz/commit/e15ef79a603a2fba89ad8f38...
    comment by lolc · 2021-02-10 · in Timezone Bullshit
  34. …can (indirectly) affect the future of leap seconds than probably any other group else. [1] https://github.com/eggert/tz/blob/master/NEWS
    comment by lifthrasiir · 2020-11-19 · in Leap second hiatus
  35. …them at the 'America' level. # So we reluctantly put them all in a subdirectory 'America/Indiana'. https://github.com/eggert/tz/blob/e6c1f0e7daa0b6c5131b2976c6...
    comment by maxwell · 2020-05-26 · in Why does Google Calendar use Vevay, Indiana (pop. 1,651) as a standard EDT city?
  36. https://github.com/eggert/tz/blob/master/northamerica is also a fun read.
    comment by shagie · 2019-11-02 · in Opinion: Standard Time all year round is the healthy choice
  37. …the political side, a read through the comments in the timezone DB can be constructive, such as: https://github.com/eggert/tz/blob/master/europe It'll really show you what anyone who thinks they can convince the whole world to change is up…
    comment by jerf · 2019-07-01 · in The Day of Two Noons
  38. ▲ 1
    Tzdata: Morocco switches from +00/+01 to permanent +01 effective 2018-10-27
    story by localguy · 2018-10-27 · 0 comments
  39. You linked to a copy embedded in pytz. Upstream database is here: https://github.com/eggert/tz
    comment by jwilk · 2018-07-28 · in News for the tz database
  40. ▲ 121
    News for the tz database
    story by Sir_Cmpwn · 2018-07-27 · 28 comments
  41. …of the next commit to tzdata would say... Edit: links: https://www.iana.org/time-zones Repo: https://github.com/eggert/tz/commits/master
    comment by AceJohnny2 · 2018-03-08 · in Permanent Daylight Saving Time? Florida Says Yes, but It’s Not So Simple
  42. …the documentation done in the IANA timezone dataset (historical references of Finland shown here): https://github.com/eggert/tz/blob/master/europe#L1213
    comment by Jhsto · 2018-01-28 · in Finland to propose that EU abolish daylight savings time
  43. They do. The problem is that the rules of DST change over time (sometimes at the very last minute https://github.com/eggert/tz/commit/868f3528a9fd60491439ce45... ) and can lead to all sorts of date math bugs when comparing timestamps…
    comment by dcornu · 2016-08-23 · in “Node.js is one of the worst things to happen to the software industry” (2012)
  44. That linked story about Michigan's -5:32:11 offset is hilarious https://github.com/eggert/tz/blob/master/northamerica#L979
    comment by imkevinxu · 2016-07-06 · in Time Zones Aren’t Offsets – Offsets Aren’t Time Zones
  45. You could Watch https://github.com/eggert/tz or subscribe to this mailing list https://www.iana.org/time-zones
    comment by mildweed · 2015-10-29 · in Time zone news
  46. …with the tz shapefiles and animate it a la xearth.[^2] [^1]: http://efele.net/maps/tz/world/ [^2]: https://github.com/eggert/tz/commit/a9ac0f6938c416f724a52115...
    comment by dfc · 2014-02-21 · in How much is time wrong around the world?