[Haskell-cafe] Adding to / subtracting from a LocalTime?

[Adde Nilsson]

Hi.
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'?

Thanks,
Adde
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