[Bug 1986984] Re: [FFe] tzdata 2022c update

[Simon Chopin]

This update has been prepared in the following PPA:
https://launchpad.net/~schopin/+archive/ubuntu/tzdata

The kinetic upload has been prepared as a full merge from Debian,
however I kept the other series' diff as small as possible by doing a
plain "upstream update". Notably, I didn't pick up the Debian changes
renaming Kiev to Kyiv in the older releases.

You'll note that the ICU data has only been updated 'til 2022b. That's
because they haven't picked up 2022c yet, and probably won't since that
last release is more of a bugfix release, with no data changes.

** Also affects: tzdata (Ubuntu Kinetic)
   Importance: Undecided
       Status: Confirmed

** Also affects: tzdata (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: tzdata (Ubuntu Jammy)
   Importance: Undecided
       Status: New

** Also affects: tzdata (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: tzdata (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: tzdata (Ubuntu Xenial)
       Status: New => Confirmed

** Changed in: tzdata (Ubuntu Bionic)
       Status: New => Confirmed

** Changed in: tzdata (Ubuntu Focal)
       Status: New => Confirmed

** Changed in: tzdata (Ubuntu Jammy)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1986984

Title:
  [FFe] tzdata 2022c update

Status in tzdata package in Ubuntu:
  Confirmed
Status in tzdata source package in Xenial:
  Confirmed
Status in tzdata source package in Bionic:
  Confirmed
Status in tzdata source package in Focal:
  Confirmed
Status in tzdata source package in Jammy:
  Confirmed
Status in tzdata source package in Kinetic:
  Confirmed

Bug description:
  New timezone data, with the following timezones impacted:
  - Chile will spring forward on 2022-09-11, not 2022-09-04 (America/Santiago)
  - Iran no longer observes DST (Asia/Tehran)

  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 Asia/Gaza'.] 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 America/Santiago | grep 'Sep.*2022'
    -> should indicate Sep 11, not Sep 4
  2) zdump -v Asia/Tehran | tail
    -> last dates should be in 2022, not in 2499

  [Test Case for releases >= 20.04 LTS]

  For releases with ICU timezone data verification is done using the following with dates before and after the change:
  1) sudo apt-get install python3-icu
  2) Run the following python script:

  from datetime import datetime
  from icu import ICUtzinfo, TimeZone
  tz = ICUtzinfo(TimeZone.createTimeZone("America/Santiago"))
  always_before = datetime(2022, 9, 1)
  now_before = datetime(2022, 9, 8)
  always_after = datetime(2022, 9, 12)
  assert(tz.utcoffset(always_before) == tz.utcoffset(now_before))
  assert(tz.utcoffset(now_before) != tz.utcoffset(always_after))

  The assertions would crash on 2022a.

  [Test Case for releases <= 20.04 LTS]

  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:
  diff <(zdump -v America/Phoenix | cut -d' ' -f2-) <(zdump -v SystemV/MST7 | cut -d' ' -f2-)

  Nothing should be returned by the above command.

  [Original report]
  tzdata 2022b and 2022c were just released that includes some timezone changes for Chile. According to the tzdata lib listed for Ubuntu 20.04, the latest package is 2022a. Any idea when 2022b or 2022c will be available? Chile made a change to the start of their daylight savings and pushed it from Sept 4th to the 11th, so we really need our servers updated before the 4th.

  Thanks

  Jason

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