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{-# LANGUAGE Safe #-}
module Data.Time.LocalTime.Internal.CalendarDiffTime (
-- * Calendar Duration
module Data.Time.LocalTime.Internal.CalendarDiffTime,
) where
import Control.DeepSeq
import Data.Data
import Data.Fixed
import Data.Time.Calendar.CalendarDiffDays
import Data.Time.Clock.Internal.NominalDiffTime
data CalendarDiffTime = CalendarDiffTime
{ ctMonths :: Integer
, ctTime :: NominalDiffTime
}
deriving
( Eq
, -- | @since 1.9.2
Data
, -- | @since 1.9.2
Typeable
)
instance NFData CalendarDiffTime where
rnf (CalendarDiffTime m t) = rnf m `seq` rnf t `seq` ()
-- | Additive
instance Semigroup CalendarDiffTime where
CalendarDiffTime m1 d1 <> CalendarDiffTime m2 d2 = CalendarDiffTime (m1 + m2) (d1 + d2)
-- | Additive
instance Monoid CalendarDiffTime where
mempty = CalendarDiffTime 0 0
mappend = (<>)
instance Show CalendarDiffTime where
show (CalendarDiffTime m t) = "P" ++ show m ++ "MT" ++ showFixed True (realToFrac t :: Pico) ++ "S"
calendarTimeDays :: CalendarDiffDays -> CalendarDiffTime
calendarTimeDays (CalendarDiffDays m d) = CalendarDiffTime m $ fromInteger d * nominalDay
calendarTimeTime :: NominalDiffTime -> CalendarDiffTime
calendarTimeTime dt = CalendarDiffTime 0 dt
-- | Scale by a factor. Note that @scaleCalendarDiffTime (-1)@ will not perfectly invert a duration, due to variable month lengths.
scaleCalendarDiffTime :: Integer -> CalendarDiffTime -> CalendarDiffTime
scaleCalendarDiffTime k (CalendarDiffTime m d) = CalendarDiffTime (k * m) (fromInteger k * d)
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