It was brought to my attention that, for Python2, midnight was also considered “false”.

>>> from datetime import time
>>> t0 = time(0)
>>> t0.isoformat()
'00:00:00'
>>> t0.strftime("%I:%M:%S")
'12:00:00'
>>> bool(t0)
False

Python3 has changed this so that all times are truthy. There’s a good article about it here:

“A False Midnight” https://lwn.net/Articles/590299/

You know what is still False in Python? Zero-length duration instances of the Timedelta class:

>>> import datetime
>>> p0 = datetime.timedelta(0)
>>> bool(p0)
False

https://docs.python.org/3/library/datetime.html#datetime.timedelta

Since they are identity elements of datetime addition, we can add these zero-size timedeltas to our table of identities.

More on that kind of thing later.