Shrink hour bug
Shrink hour bug

Shrink datetime at hour level wrong.

jhamm/FsCheck,ploeh/FsCheck,fscheck/FsCheck,ErikSchierboom/FsCheck,forki/FsCheck,yukitos/FsCheck,forki/FsCheck,paulyoung/FsCheck,cloudRoutine/FsCheck,yukitos/FsCheck,yukitos/FsCheck,cloudRoutine/FsCheck,fscheck/FsCheck,fsharp/FsCheck,sideeffffect/FsCheck,paulyoung/FsCheck