-- | TAI and leap-second maps for converting to UTC: most people won't need this module.
module Data.Time.Clock.Internal.AbsoluteTime
(
    -- TAI arithmetic
    AbsoluteTime,taiEpoch,addAbsoluteTime,diffAbsoluteTime,
    taiNominalDayStart,
) where

import Data.Typeable
import Data.Data
import Control.DeepSeq
import Data.Time.Calendar.Days
import Data.Time.Clock.Internal.DiffTime


-- | AbsoluteTime is TAI, time as measured by a clock.
newtype AbsoluteTime = MkAbsoluteTime DiffTime deriving (AbsoluteTime -> AbsoluteTime -> Bool
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instance NFData AbsoluteTime where
    rnf :: AbsoluteTime -> ()
rnf (MkAbsoluteTime DiffTime
a) = DiffTime -> ()
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rnf DiffTime
a

-- | The epoch of TAI, which is 1858-11-17 00:00:00 TAI.
taiEpoch :: AbsoluteTime
taiEpoch :: AbsoluteTime
taiEpoch = DiffTime -> AbsoluteTime
MkAbsoluteTime DiffTime
0

taiNominalDayStart :: Day -> AbsoluteTime
taiNominalDayStart :: Day -> AbsoluteTime
taiNominalDayStart Day
day = DiffTime -> AbsoluteTime
MkAbsoluteTime (DiffTime -> AbsoluteTime) -> DiffTime -> AbsoluteTime
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$ Integer -> DiffTime
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toModifiedJulianDay Day
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-- | addAbsoluteTime a b = a + b
addAbsoluteTime :: DiffTime -> AbsoluteTime -> AbsoluteTime
addAbsoluteTime :: DiffTime -> AbsoluteTime -> AbsoluteTime
addAbsoluteTime DiffTime
t (MkAbsoluteTime DiffTime
a) = DiffTime -> AbsoluteTime
MkAbsoluteTime (DiffTime
a DiffTime -> DiffTime -> DiffTime
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t)

-- | diffAbsoluteTime a b = a - b
diffAbsoluteTime :: AbsoluteTime -> AbsoluteTime -> DiffTime
diffAbsoluteTime :: AbsoluteTime -> AbsoluteTime -> DiffTime
diffAbsoluteTime (MkAbsoluteTime DiffTime
a) (MkAbsoluteTime DiffTime
b) = DiffTime
a DiffTime -> DiffTime -> DiffTime
forall a. Num a => a -> a -> a
- DiffTime
b