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

[Brian Murray]

tzdata verification for focal:

bdmurray at clean-focal-amd64:~$ zdump -v Africa/Juba | grep 2021
bdmurray at clean-focal-amd64:~$ sudo apt-get install tzdata
[sudo] password for bdmurray: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages will be upgraded:
  tzdata
1 upgraded, 0 newly installed, 0 to remove and 30 not upgraded.
Need to get 295 kB of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 http://192.168.10.7/ubuntu focal-proposed/main amd64 tzdata all 2021a-0ubuntu0.20.04 [295 kB]
Fetched 295 kB in 0s (9,897 kB/s)
Preconfiguring packages ...
(Reading database ... 223660 files and directories currently installed.)
Preparing to unpack .../tzdata_2021a-0ubuntu0.20.04_all.deb ...
Unpacking tzdata (2021a-0ubuntu0.20.04) over (2020f-0ubuntu0.20.04.1) ...
Setting up tzdata (2021a-0ubuntu0.20.04) ...

Current default time zone: 'America/Los_Angeles'
Local time is now:      Thu Jan 28 09:33:43 PST 2021.
Universal Time is now:  Thu Jan 28 17:33:43 UTC 2021.
Run 'dpkg-reconfigure tzdata' if you wish to change it.

bdmurray at clean-focal-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

verification of the icu-data change:

bdmurray at clean-focal-amd64:~$ python3 -c "from datetime import datetime; from icu import ICUtzinfo, TimeZone; tz = ICUtzinfo(TimeZone.create
TimeZone('Africa/Juba')); print(str(tz.utcoffset(datetime(2021, 2, 1))))"
2:00:00


** Tags removed: verification-needed-focal
** Tags added: verification-done-focal

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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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