DiffTime package:rebase

This is a length of time, as measured by a clock. Conversion functions such as fromInteger and realToFrac will treat it as seconds. For example, (0.010 :: DiffTime) corresponds to 10 milliseconds. It has a precision of one picosecond (= 10^-12 s). Enumeration functions will treat it as picoseconds.
Get the number of picoseconds in a DiffTime.
This is a length of time, as measured by UTC. It has a precision of 10^-12 s. Conversion functions such as fromInteger and realToFrac will treat it as seconds. For example, (0.010 :: NominalDiffTime) corresponds to 10 milliseconds. It has a precision of one picosecond (= 10^-12 s). Enumeration functions will treat it as picoseconds. It ignores leap-seconds, so it's not necessarily a fixed amount of clock time. For instance, 23:00 UTC + 2 hours of NominalDiffTime = 01:00 UTC (+ 1 day), regardless of whether a leap-second intervened.
Get the seconds in a NominalDiffTime.
Create a DiffTime from a number of picoseconds.
Scale by a factor. Note that scaleCalendarDiffTime (-1) will not perfectly invert a duration, due to variable month lengths.
Create a DiffTime which represents an integral number of seconds.
Create a NominalDiffTime from a number of seconds.