Is there a Haskell Time Typeclass

Question

I want to build a function with type signature Time t => t -> Bool. When looking at the documentation of Data.Time there are several different types that work on time, such as: UTCTime, LocalTime, and ZonedTime, but I find no typeclass that unifies them. Is there any such one or should I treat time just as a Num? (i.e. a continuum)

Answer 1

The vector-space package has a affine space typeclass.

Diff p is here the time duration type (which should be an instance of VectorSpace), and p is the time point type. You'll need an extra Ord instance for comparisons.

This provides you with linear interpolation between time points for free.