[Bug 2017999] Re: tzdata 2023c-0ubuntu0.22.04.1 might have some inconsistency

[Launchpad Bug Tracker]

This bug was fixed in the package tzdata - 2023c-4exp1ubuntu1

---------------
tzdata (2023c-4exp1ubuntu1) mantic; urgency=medium

  * Merge with Debian experimental. Remaining changes:
    - Ship 2023c ICU timezone data which are utilized by PHP in tzdata-icu
    - Add autopkgtest test case for ICU timezone data
    - Do not rename NEWS into changelog.gz, this fixes a build failure on
      moment-timezone.js
    - Point Vcs-Browser/Git to Launchpad
    - generate_debconf_templates: Work around AttributeError on icu import

tzdata (2023c-4exp1) experimental; urgency=medium

  * Drop /usr/share/zoneinfo/posix (identical to /usr/share/zoneinfo)
    (LP: #2008076)
  * Split right/* timezones into separate tzdata-legacy package (LP: #2008076)
  * Drop providing tzdata-bookworm from tzdata

tzdata (2023c-4) unstable; urgency=medium

  * Sort timezones naturally in debconf
  * Add explanation for plus/minus used by Etc/GMT timezones
    (Closes: #540305, LP: #1325949)
  * Build tzdata with PACKRATLIST=zone.tab. In combination with
    PACKRATDATA=backzone (which is used since 2022g-3), time zones that differ
    pre-1970 and had been resurrected will not incur changes to data from 1970
    on. This also removes Asia/Hanoi again. (LP: #2017999)
  * Update Croatian debconf translation. Thanks to Tomislav Krznar.

tzdata (2023c-3) unstable; urgency=medium

  * test_timezone_conversions: Print all failures before failing
  * Add Romanian debconf translation. Thanks to Remus-Gabriel Chelu
    (Closes: #1034094)
  * Add Language metadata to all debconf translation files
  * Convert Pacific/Ponape to Pacific/Pohnpei on upgrade
  * Convert Asia/Ujung_Pandang to Asia/Makassar on upgrade
  * Convert Pacific/Truk to Pacific/Chuuk on upgrade
  * Fix or drop wrong translations
  * Check debconf translation files for inconsistencies
  * Fix German translation of Christmas and Easter Island

 -- Benjamin Drung <bdrung at ubuntu.com>  Wed, 10 May 2023 00:26:05 +0200

** Changed in: tzdata (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/2017999

Title:
  tzdata 2023c-0ubuntu0.22.04.1 might have some inconsistency

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

Bug description:
  [ Impact ]

  Recent updates have been using `PACKRATDATA=backzone` in order to add
  all out-of-scope lower-quality pre-1970 data back that existed in
  earlier tzadata releases (see bug #2003797). However it also leads to
  time zones like America/Ensenada, Atlantic/Jan_Mayen, Europe/Tiraspol,
  and Pacific/Enderbury to change:

  compared to 2023c-0ubuntu0.22.04.0
  - America/Ensenada->only dst changes until 2022 are shown
  - Atlantic/Jan_Mayen->now valid data is shown
  - Europe/Tiraspol->only dst changes until 2010 are shown

  [ Test Plan ]

  Add an autopkgtest test case for post-1970 symlink consistency: Check
  that the timezones for today and in half a year (= to cover DST
  changes) do not change compared to building them without
  `PACKRATDATA=backzone`.

  The mentioned timezones that differed can also be tested manually.
  Running following commands should have the same output (the output
  mentioned here is from tzdata 2023c-0ubuntu0.22.04.1):

  ```
  $ TZ=America/Ensenada date -d "2023-04-28 13:49 Z"
  Fri Apr 28 05:49:00 PST 2023
  $ TZ=Atlantic/Jan_Mayen date -d "2023-04-28 13:49 Z"
  Fri Apr 28 12:49:00 -01 2023
  $ TZ=Europe/Tiraspol date -d "2023-04-28 13:49 Z"
  Fri Apr 28 16:49:00 MSK 2023
  ```

  [ Where problems could occur ]

  Timezone data could be wrong. Systems with incorrect timezone set may
  observe unexpected time shift when updating the package.

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