I’ve started a new library called Tempo that has some lofty goals that may not work out:
- Unify
Date,Time,NaiveDateTimeandDateTimeinto a single structure - Represent time as intervals and sets of intervals, not scalars
- Make times composable, enumerable and comparable with interval algebra
- Support discontinuous times and recurring times
A grand unifying theory of time 
I’ve started a blog to explain my reasoning at https://kipcole9.github.io/tempo
