Replace uses of deprecated datetime.utcnow()
#2468
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dgw
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Housekeeping
dgw
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datetime.utcnow()
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Description
As @SnoopJ mentioned on IRC right after opening #2457,
datetime.utcnow()is deprecated in Python 3.12 (and alsodatetime.utcfromtimestamp()). The recommended replacements for those items have been usable for most of Python 3's history—though we don't get to usedatetime.UTCinstead ofdatetime.timezone.utcuntil Python 3.11 is our minimum version.Checklist
make qa(runsmake qualityandmake test)Notes
As often happens when I poke at stuff, there are some minor documentation corrections lumped in here that I didn't think warranted (a) separate PR(s).
I wanted to go further with this and get rid of
pytz, butzoneinfoisn't available until Python 3.9. (There is abackports.zoneinfopackage, but it hasn't been updated in a while and its issue tracker is starting to fill with reports of errors & warnings.)