Have you tried arrow (my favorite), dolorean or a third one the name escapes me right now?

I use arrow whenever I need to process a date, no matter the usage. Having a consistent interface is golden.

EDIT I just realized that the author of moment in Python (you link to) also mentions arrow. I have to remember the name of the third package, it addressed some weaknesses in arrow (particularly issues with failed parsing which does not output an error)