add alternative for date-fns or other moments alternatives

[weihsth]

Hey there! Very nice component you wrote here! Would it be hard to also allow other date libraries like date-fns, which is based on native JavaScript Date object.

[weihsth]

If you ask the "why" question, here is a nice overview: https://github.com/you-dont-need/You-Dont-Need-Momentjs