Make web logs timestamps DST aware

[sgaist]

What do these changes do?

Make web logs timestamps DST aware using the tm_gmtoff value rather than the static timezone information.

Are there changes in behavior for the user?

There might be a jump in timestamps where DST changes

Is it a substantial burden for the maintainers to support this?

There should be no burden for maintainers as there is no new code.

Related issue number

Fixes #11283

Checklist

• [X] I think the code is well written
• [X] Unit tests for the changes exist
• [X] Documentation reflects the changes
• [X] If you provide code modification, please add yourself to CONTRIBUTORS.txt
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• [X] Add a new news fragment into the CHANGES/ folder

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    • .misc: Changes that are hard to assign to any of the above categories.

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    Fixed issue with non-ascii contents in doctest text files
    -- by :user:`contributor-gh-handle`.
    

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[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 98.80%. Comparing base (281479a) to head (d7319a7). :white_check_mark: All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11557      +/-   ##
==========================================
- Coverage   98.80%   98.80%   -0.01%     
==========================================
  Files         127      127              
  Lines       43380    43383       +3     
  Branches     2326     2326              
==========================================
+ Hits        42861    42863       +2     
  Misses        370      370              
- Partials      149      150       +1     

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[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #11557 will not alter performance

_{Comparing sgaist:11283-make-weblog-dst-aware (0e6e313) with master (a7c21bb)}

Summary

✅ 59 untouched

[Dreamsorcerer]

Can we have a regression test showing that DST is taken into account?

We have freezegun installed for tests, so we could use that to write a test dated in DST and one out of DST.

[Dreamsorcerer]

If you have time to finish this off by tomorrow, I'll get it included in the 3.13 release.

[sgaist]

@Dreamsorcerer I'll try, just need to check how to use freezegun.

[Dreamsorcerer]

@Dreamsorcerer I'll try, just need to check how to use freezegun.

In test_cookiejar.py, we just use the context manager to set the date.

[sgaist]

@Dreamsorcerer I have modified the implementation as using freezgun unearthed an interesting issue with tm_gmtoff: it can be empty.

I added a test to check that DST is reflected however I have not been able to make it work as I wanted with regard to adjusting the hour.