[Bug 1913482] Re: Update tzdata to version 2021a

[Brian Murray]

Verification for Bionic:

bdmurray at clean-bionic-amd64:~$ apt-cache policy tzdata
tzdata:
  Installed: 2021a-0ubuntu0.18.04
  Candidate: 2021a-0ubuntu0.18.04
  Version table:
 *** 2021a-0ubuntu0.18.04 500
        500 http://ubuntu.osuosl.org/ubuntu bionic-proposed/main amd64 Packages
        500 http://ubuntu.osuosl.org/ubuntu bionic-proposed/main i386 Packages
        100 /var/lib/dpkg/status
     2020f-0ubuntu0.18.04 500
        500 http://ubuntu.osuosl.org/ubuntu bionic-updates/main amd64 Packages
        500 http://ubuntu.osuosl.org/ubuntu bionic-updates/main i386 Packages
        500 http://ubuntu.osuosl.org/ubuntu bionic-security/main amd64 Packages
        500 http://ubuntu.osuosl.org/ubuntu bionic-security/main i386 Packages
     2018d-1 500
        500 http://ubuntu.osuosl.org/ubuntu bionic/main amd64 Packages
        500 http://ubuntu.osuosl.org/ubuntu bionic/main i386 Packages
bdmurray at clean-bionic-amd64:~$ zdump -v Africa/Juba | grep 2021
Africa/Juba  Sun Jan 31 20:59:59 2021 UT = Sun Jan 31 23:59:59 2021 EAT isdst=0 gmtoff=10800
Africa/Juba  Sun Jan 31 21:00:00 2021 UT = Sun Jan 31 23:00:00 2021 CAT isdst=0 gmtoff=7200

System V Test Case:

bdmurray at clean-bionic-amd64:~$ diff <(zdump -v America/Phoenix | cut -d' ' -f2-) <(zdump -v SystemV/MST7 | cut -d' ' -f2-)
bdmurray at clean-bionic-amd64:~$

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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 Committed
Status in tzdata source package in Groovy:
  Fix Committed

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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