Updates for Python 3.12 - #3288
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Now that python/cpython#105808 is fixed in beta 3.
Python 3.12 deprecates the utcnow and utcfromtimestamp methods and discourages the use of naive datetimes to represent UTC. This was previously the main way that Tornado used datetimes (since it was the only option available in Python 2 before the introduction of datetime.timezone.utc in Python 3.2). - httpclient_test: Test-only change to test that both kinds of datetimes are supported in If-Modified-Since (this just calls httputil.format_timestamp) - httputil: No functional changes, but format_timestamp's support for both naive and aware datetimes is now tested. - locale: format_timestamp now supports aware datetimes (in addition to the existing support for naive datetimes). - web: Cookie expirations internally use aware datetimes. StaticFileHandler.get_modified_time now supports both and the standard implementation returns aware. It feels fragile that "naive" and "aware" datetimes are not distinct types but subject to data-dependent behavior. This change uses "aware" datetimes throughout Tornado, but some operations (comparisons and subtraction) fail with mixed datetime types and if I missed any in this change may cause errors if naive datetimes were used (where previously naive datetimes would have been required). But that's apparently the API we have to work with.
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This was referenced Oct 3, 2023
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Now that the gzip bug (python/cpython#105808) is fixed in 3.12b3, we can bring that version back to CI. We also need to pick up a newer version of tox and make some changes to datetime handling to avoid deprecation warnings.
Fixes #3278
Closes #3277