NominalDiffTime -is:exact -package:hledger-web -package:netwire package:turtle
This is a length of time, as measured by UTC. It has a precision of
10^-12 s.
Conversion functions will treat it as seconds. For example, (0.010
:: NominalDiffTime) corresponds to 10 milliseconds.
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.