[tomlagier]

A couple of references for why building a time-based application is difficult:

Falsehoods programmers believe about time: https://infiniteundo.com/post/25326999628/falsehoods-program...

Falsehoods programmers believe about time part 2 (this one contains most of the timezone related madness): https://infiniteundo.com/post/25509354022/more-falsehoods-pr...