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[Launchpad Bug Tracker <1913482@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package tzdata - 2021a-0ubuntu0.20.10

---------------
tzdata (2021a-0ubuntu0.20.10) groovy; urgency=medium

  * New upstream version (LP: #1913482), affecting the following future timestamp:
    - South Sudan changes from +03 to +02 on 2021-02-01 at 00:00.
  * Update ICU timezone data files which are utilized by php and update them
    to 2021a.

 -- Brian Murray <brian@xxxxxxxxxx>  Wed, 27 Jan 2021 11:53:19 -0800

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

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https://bugs.launchpad.net/bugs/1913482

Title:
  Update tzdata to version 2021a

Status in tzdata package in Ubuntu:
  In Progress
Status in tzdata source package in Xenial:
  Fix Committed
Status in tzdata source package in Bionic:
  Fix Committed
Status in tzdata source package in Focal:
  Fix Released
Status in tzdata source package in Groovy:
  Fix Released

Bug description:
  New upstream version affecting the following timestamp:

  - South Sudan changes from +03 to +02 on 2021-02-01 at 00:00.

  $region/$timezone = Africa/Juba

  Verification is done with 'zdump'. The first timezone that gets
  changed in the updated package is dumped with 'zdump -v
  $region/$timezone_that_changed' (this needs to be greped for in
  /usr/share/zoneinfo/). [For example: 'zdump -v Africa/Juba'.] This is
  compared to the same output after the updated package got installed.
  If those are different the verification is considered done.

  [Test Case for all releases]
  1) zdump -v Africa/Juba | grep 2021

  For releases with ICU timezone data verification is done using the following with dates before and after the change:
  [Test Case for releases >= 20.04 LTS]
  1) sudo apt-get install python3-icu
  2) python3 -c 'from datetime import datetime; from icu import ICUtzinfo, TimeZone; tz = ICUtzinfo(TimeZone.creat eTimeZone('Africa/Juba')); print(str(tz.utcoffset(datetime(2021, 2, 1))))'

  Additionally, an upstream update of tzdata removed the 'old' SystemV
  timezones, so we should ensure that they are kept in Ubuntu 20.04 LTS
  and earlier releases. Subsequently, these should be checked for using
  the following:

  [Test Case for releases <= 20.04 LTS]
  diff <(zdump -v America/Phoenix | cut -d' ' -f2-) <(zdump -v SystemV/MST7 | cut -d' ' -f2-)

  Nothing should be returned by the above command.

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