[Haskell-cafe] Adding to / subtracting from a LocalTime?
roma at ro-che.info
Sun Aug 19 19:42:07 CEST 2012
On Sat, Aug 18, 2012 at 8:27 PM, Adde Nilsson <trialcodr at gmail.com> wrote:
> How do you add to or subtract from a LocalTime?
> I'm trying to subtract a second from a LocalTime value but the only API's
> I can find act only on the TimeOfDay part.
> subSec :: LocalTime -> LocalTime
> subSec (LocalTime d t) = LocalTime d $ timeToTimeOfDay ((timeOfDayToTime
> t) - (secondsToDiffTime 1))
> I'm obviously on the wrong track as this looks way too complex for what
> it's trying to achieve.
> Calling with '2012-08-18 00:00:00' gives '2012-08-18 -01:59:59' which
> isn't very helpful. How do I get to '2012-08-17 23:59:59'?
The time-lens  package should do what you need.
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