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https://bugs.launchpad.net/bugs/2047314

Title:
  tzdata 2023d release (leap-second.list expiring this week)

Status in tzdata package in Ubuntu:
  Fix Released
Status in tzdata source package in Focal:
  Fix Released
Status in tzdata source package in Jammy:
  Fix Released
Status in tzdata source package in Lunar:
  Fix Released
Status in tzdata source package in Mantic:
  Fix Released

Bug description:
  [ Impact ]

  leap-seconds.list shipped by tzdata 2023c expired on Dec 28th 2023.

  The 2023d release contains the following changes:

     Briefly:
       Ittoqqortoormiit, Greenland changes time zones on 2024-03-31.
       Vostok, Antarctica changed time zones on 2023-12-18.
       Casey, Antarctica changed time zones five times since 2020.
       Code and data fixes for Palestine timestamps starting in 2072.
       A new data file zonenow.tab for timestamps starting now.

     Changes to future timestamps

       Ittoqqortoormiit, Greenland (America/Scoresbysund) joins most of
       the rest of Greenland's timekeeping practice on 2024-03-31, by
       changing its time zone from -01/+00 to -02/-01 at the same moment
       as the spring-forward transition.  Its clocks will therefore not
       spring forward as previously scheduled.  The time zone change
       reverts to its common practice before 1981.

       Fix predictions for DST transitions in Palestine in 2072-2075,
       correcting a typo introduced in 2023a.

     Changes to past and future timestamps

       Vostok, Antarctica changed to +05 on 2023-12-18.  It had been at
       +07 (not +06) for years.  (Thanks to Zakhary V. Akulov.)

       Change data for Casey, Antarctica to agree with timeanddate.com,
       by adding five time zone changes since 2020.  Casey is now at +08
       instead of +11.

     Changes to past tm_isdst flags

       Much of Greenland, represented by America/Nuuk, changed its
       standard time from -03 to -02 on 2023-03-25, not on 2023-10-28.
       This does not affect UTC offsets, only the tm_isdst flag.
       (Thanks to Thomas M. Steenholdt.)

     New data file

       A new data file zonenow.tab helps configure applications that use
       timestamps dated from now on.  This simplifies configuration,
       since users choose from a smaller Zone set.  The file's format is
       experimental and subject to change.

  [ Test Plan ]

  Test cases were added to autopkgtest to cover the testing:

  * python: test_2023d

  So the test plan is to check that all autopkgtest succeeds.

  [ Other Info ]

  The autopkgtest for chrony is flaky on jammy and newer (see bug
  #2002910).

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