`.pyc` file in zipapp can be marked as stale if opened in a different timezone than the one it was created in

Bug report

Bug description:

_get_mtime_and_size_of_source uses localtime rather than UTC --- in a zipapp, if the pyc was created in a timezone that is different than the timezone of the computer that it is being run on, it can be marked as 'stale', even though it shouldn't be --- for example, if the source file was last modified at 3:30 EST, that 3:30 EST will be stored in the pyc file as a Unix timestamp. However, if the zipapp is then transferred to a computer running PST, the modification time of the source file will be read from the zip file as 3:30 PST in unix time (through time.mktime), which will obviously be different than the 3:30 EST read from the pyc file directly (since it is never passed through time.mktime).

This seems to be because zip files do not store timezones with mtime, so Python is forced to interpret it as local time.

CPython versions tested on:

3.11, 3.13

Operating systems tested on:

Linux, macOS

Linked PRs

• gh-143868
• gh-143953

Beginne bei _get_mtime_and_size_of_source und verfolge, wie die mtime der zipapp-Quelle mit time.mktime im Vergleich zu pyc-Zeitstempeln umgewandelt werden. Reproduziere den beschriebenen Zeitzonenunterschied für Python 3.11 oder 3.13 unter Linux oder macOS und verifiziere anschließend, dass ein zwischen Zeitzonen übertragenes pyc nicht mehr fälschlicherweise als veraltet markiert wird.