On: 2020 Leap Day Bugs

[user982]

  Python 2.7.17 (default, Dec 31 2019, 23:59:25) 
  Type "help", "copyright", "credits" or "license" for more information.
  >>> from datetime import datetime
  >>> datetime.strptime('Sat 29 Feb 12:00:00 PM', '%a %d %b %I:%M:%S %p')
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
  ValueError: day is out of range for month

[park_94110 → user982]

This is because 1900 is the default year in datetime. 1900 was not a leap year.

[user982 → park_94110]

I know, I'm just providing a counterexample to phoobahr.