gistfile1.txt

Python 3.8.1 (default, Dec 31 2019, 18:44:59) 
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import datetime
>>> samoa = datetime.timezone(datetime.timedelta(hours=14))
>>> before = datetime.datetime(2011, 12, 29, tzinfo=samoa)
>>> before + datetime.timedelta(days=1)
datetime.datetime(2011, 12, 30, 0, 0, tzinfo=datetime.timezone(datetime.timedelta(seconds=50400)))
>>> 

The conclusion is that, unsurprisingly, dates are bullshit, and the less anyone can have to do with them, the better. If someone else has written something to handle dates, use that.

We're Python. We shouldn't be scared of dependencies.