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1. Commits on Oct 23, 2026

   • gh-160420: Reject drive letters in ZoneInfo key components on Windows (GH-160421)

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     gpshead

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     0615b5cView commit details

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2. Commits on Oct 21, 2026

   • gh-159706: Fix pure-Python ZoneInfo.fromutc() fold detection for single-transition zones (#159828)

     lazerg

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     1c5b959View commit details

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   • gh-159714: Fix `ZoneInfo` Julian day 59 in leap years (#159721)

     pganssle

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     16c0adcView commit details

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3. Commits on Jul 2, 2026

   • gh-152847: Reject POSIX TZ rule with non-digit day-of-year in `_zoneinfo.py` (#152848)

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     tonghuaroot

     and

     StanFromIreland

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     31864bdView commit details

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4. Commits on Jun 30, 2026

   • gh-152248: Reject a POSIX TZ abbreviation with non-ASCII-letters in pure-Python `zoneinfo` (#152249)

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     tonghuaroot

     and

     StanFromIreland

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     449122eView commit details

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5. Commits on Jun 27, 2026

   • gh-152212: Reject a POSIX TZ footer with a missing std offset in pure-Python `zoneinfo` (#152213)

     tonghuaroot

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     93454feView commit details

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6. Commits on Jun 26, 2026

   • gh-152246: Fix pure-Python `zoneinfo` accepting invalid seperators in POSIX TZ rules (#152247)

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     tonghuaroot

     and

     StanFromIreland

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     f47acc7View commit details

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7. Commits on Jun 15, 2026

   • gh-140145: Use repr of the key in `zoneinfo` "No time zone found" error (#140433)

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     LamentXU123

     and

     StanFromIreland

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     585e14cView commit details

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8. Commits on Apr 4, 2026

   • gh-145883: Fix two heap-buffer-overflows in `_zoneinfo` (#145885)

     StanFromIreland

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     fe9befcView commit details

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9. Commits on Mar 10, 2026

   • gh-142763: Fix race in ZoneInfo cache eviction (gh-144978)

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     colesbury

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10. Commits on Dec 28, 2025

    • gh-143241: Fix infinite loop in `zoneinfo._common.load_data` (#143243)

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11. Commits on Sep 18, 2025

    • gh-137976: Explicitly exclude `localtime` from `available_timezones` (#138012)

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12. Commits on Sep 11, 2025

    • gh-138432: Improved invalid path checking in zoneinfo.reset_tzpath() (GH-138433)

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      tungol

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13. Commits on Aug 23, 2025

    • gh-137754: Fix import of zoneinfo if _datetime is not available (GH-137845)

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      serhiy-storchaka

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14. Commits on Aug 17, 2025

    • GH-137841: Open tzdata/zones file with UTF-8 encoding (#137872)

      AA-Turner

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      25b9728View commit details

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15. Commits on Jun 30, 2025

    • gh-85702: Catch PermissionError in zoneinfo.load_tzdata() (#136117)

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      vstinner

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      ZeroIntensity

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      ee47670View commit details

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16. Commits on Jun 19, 2025

    • gh-135273: Unify `ZoneInfo.from_file` signatures (#135274)

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      hrimov

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      7cc8949View commit details

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17. Commits on May 3, 2025

    • gh-114713: Revert gh-114731 (#133330)

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      Eclips4

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18. Commits on Apr 15, 2025

    • gh-114713: Handle case of an empty string passed to `zoneinfo.ZoneInfo` (#114731)

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19. Commits on Apr 14, 2025

    • gh-85702: Catch IsADirectoryError in zoneinfo (#131333)

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      StanFromIreland

      and

      vstinner

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20. Commits on Feb 6, 2024

    • gh-106233: Fix stacklevel in zoneinfo.InvalidTZPathWarning (GH-106234)

      sobolevn

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      d7334e2View commit details

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21. Commits on Oct 14, 2023

    • bpo-42663: Fix parsing TZ strings in zoneinfo module (GH-23825)

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      serhiy-storchaka

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22. Commits on Mar 2, 2023

    • Fix typos in documentation and comments (GH-102374)

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      michael-k

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      7325000View commit details

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23. Commits on Jan 21, 2022

    • bpo-46124: Update zoneinfo to rely on importlib.resources traversable API. (GH-30190)

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      jaraco

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      00b2b57View commit details

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24. Commits on Oct 6, 2021

    • Fix typos in the Lib directory (GH-28775)

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      cclauss

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      terryjreedy

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      745c9d9View commit details

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25. Commits on Apr 25, 2021

    • fix typo in warning (#20620)

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      aboddie

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26. Commits on Jun 23, 2020

    • bpo-41065: Use zip-strict in zoneinfo (GH-21031)

      cool-RR

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      bc43f6eView commit details

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27. Commits on Jun 3, 2020

    • Update error message in _zoneinfo.py to use f-string (GH-20577)

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      aboddie

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28. Commits on May 29, 2020

    • Further de-linting of zoneinfo module (#20499)

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      pganssle

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29. Commits on May 24, 2020

    • bpo-40443: Remove unused imports in the zoneinfo (GH-20354)

      corona10

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      3436f5fView commit details

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30. Commits on May 18, 2020

    • bpo-40536: Add zoneinfo.available_timezones (GH-20158)

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      pganssle

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      e527ec8View commit details

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31. Commits on May 16, 2020

    • bpo-40503: PEP 615: Tests and implementation for zoneinfo (GH-19909)

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      pganssle

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      62972d9View commit details

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