[Haskell-cafe] Adding to / subtracting from a LocalTime?
paolo.veronelli at gmail.com
Sat Aug 18 19:53:26 CEST 2012
This is a part of a solution, with explicit TimeZone
Prelude Data.Time> :t \z s t -> utcToLocalTime z $ addUTCTime (fromIntegral
s) (localTimeToUTC z t)
\z s t -> utcToLocalTime z $ addUTCTime (fromIntegral s) (localTimeToUTC z
:: Integral a => TimeZone -> a -> LocalTime -> LocalTime
where the Integral arguments is in seconds, by docs
2012/8/18 Adde Nilsson <trialcodr at gmail.com>
> 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'?
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> Haskell-Cafe at haskell.org
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