    {-# LANGUAGE Safe #-}

    -- | 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 Control.DeepSeq
    import Data.Data
    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 -> ()
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    a) = DiffTime -> ()
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    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
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    -- | addAbsoluteTime a b = a + b
    addAbsoluteTime :: DiffTime -> AbsoluteTime -> AbsoluteTime
    addAbsoluteTime :: DiffTime -> AbsoluteTime -> AbsoluteTime
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    -- | diffAbsoluteTime a b = a - b
    diffAbsoluteTime :: AbsoluteTime -> AbsoluteTime -> DiffTime
    diffAbsoluteTime :: AbsoluteTime -> AbsoluteTime -> DiffTime
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