Comment 6 for bug 1945527

bdmurray@clean-focal-amd64:~$ apt-cache policy tzdata
tzdata:
  Installed: 2021a-0ubuntu0.20.04
  Candidate: 2021a-2ubuntu0.20.04
  Version table:
     2021a-2ubuntu0.20.04 500
        500 http://192.168.10.7/ubuntu focal-proposed/main amd64 Packages
        500 http://192.168.10.7/ubuntu focal-proposed/main i386 Packages
 *** 2021a-0ubuntu0.20.04 500
        500 http://192.168.10.7/ubuntu focal-updates/main amd64 Packages
        500 http://192.168.10.7/ubuntu focal-updates/main i386 Packages
        500 http://192.168.10.7/ubuntu focal-security/main amd64 Packages
        500 http://192.168.10.7/ubuntu focal-security/main i386 Packages
        100 /var/lib/dpkg/status
     2019c-3ubuntu1 500
        500 http://192.168.10.7/ubuntu focal/main amd64 Packages
        500 http://192.168.10.7/ubuntu focal/main i386 Packages
bdmurray@clean-focal-amd64:~$ zdump -v Pacific/Apia | grep 2021
Pacific/Apia Sat Apr 3 13:59:59 2021 UT = Sun Apr 4 03:59:59 2021 +14 isdst=1 gmtoff=50400
Pacific/Apia Sat Apr 3 14:00:00 2021 UT = Sun Apr 4 03:00:00 2021 +13 isdst=0 gmtoff=46800
Pacific/Apia Sat Sep 25 13:59:59 2021 UT = Sun Sep 26 02:59:59 2021 +13 isdst=0 gmtoff=46800
Pacific/Apia Sat Sep 25 14:00:00 2021 UT = Sun Sep 26 04:00:00 2021 +14 isdst=1 gmtoff=50400
bdmurray@clean-focal-amd64:~$ python3 -c "from datetime import datetime; from icu import ICUtzinfo, TimeZone; tz = ICUtzinfo(TimeZone.createTimeZone('Pacific/Apia')); print(str(tz.utcoffset(datetime(2021, 9, 27))))"
14:00:00
bdmurray@clean-focal-amd64:~$ apt-cache policy tzdata
tzdata:
  Installed: 2021a-2ubuntu0.20.04
  Candidate: 2021a-2ubuntu0.20.04
  Version table:
 *** 2021a-2ubuntu0.20.04 500
        500 http://192.168.10.7/ubuntu focal-proposed/main amd64 Packages
        500 http://192.168.10.7/ubuntu focal-proposed/main i386 Packages
        100 /var/lib/dpkg/status
     2021a-0ubuntu0.20.04 500
        500 http://192.168.10.7/ubuntu focal-updates/main amd64 Packages
        500 http://192.168.10.7/ubuntu focal-updates/main i386 Packages
        500 http://192.168.10.7/ubuntu focal-security/main amd64 Packages
        500 http://192.168.10.7/ubuntu focal-security/main i386 Packages
     2019c-3ubuntu1 500
        500 http://192.168.10.7/ubuntu focal/main amd64 Packages
        500 http://192.168.10.7/ubuntu focal/main i386 Packages
bdmurray@clean-focal-amd64:~$ zdump -v Pacific/Apia | grep 2021
Pacific/Apia Sat Apr 3 13:59:59 2021 UT = Sun Apr 4 03:59:59 2021 +14 isdst=1 gmtoff=50400
Pacific/Apia Sat Apr 3 14:00:00 2021 UT = Sun Apr 4 03:00:00 2021 +13 isdst=0 gmtoff=46800
bdmurray@clean-focal-amd64:~$ python3 -c "from datetime import datetime; from icu import ICUtzinfo, TimeZone; tz = ICUtzinfo(TimeZone.createTimeZone('Pacific/Apia')); print(str(tz.utcoffset(datetime(2021, 9, 27))))"
13:00:00
And the regression check:
bdmurray@clean-focal-amd64:~$ diff <(zdump -v America/Phoenix | cut -d' ' -f2-) <(zdump -v SystemV/MST7 | cut -d' ' -f2-)