module Data.Time.Clock.Internal.UTCTime
(
    -- * UTC
    -- | UTC is time as measured by a clock, corrected to keep pace with the earth by adding or removing
    -- occasional seconds, known as \"leap seconds\".
    -- These corrections are not predictable and are announced with six month's notice.
    -- No table of these corrections is provided, as any program compiled with it would become
    -- out of date in six months.
    --
    -- If you don't care about leap seconds, use 'UTCTime' and 'NominalDiffTime' for your clock calculations,
    -- and you'll be fine.
    UTCTime(..),
) where

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


-- | This is the simplest representation of UTC.
-- It consists of the day number, and a time offset from midnight.
-- Note that if a day has a leap second added to it, it will have 86401 seconds.
data UTCTime = UTCTime {
    -- | the day
    UTCTime -> Day
utctDay :: Day,
    -- | the time from midnight, 0 <= t < 86401s (because of leap-seconds)
    UTCTime -> DiffTime
utctDayTime :: DiffTime
} deriving (Typeable UTCTime
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instance NFData UTCTime where
    rnf :: UTCTime -> ()
rnf (UTCTime Day
d DiffTime
t) = Day -> ()
forall a. NFData a => a -> ()
rnf Day
d () -> () -> ()
`seq` DiffTime -> ()
forall a. NFData a => a -> ()
rnf DiffTime
t () -> () -> ()
`seq` ()

instance Eq UTCTime where
    (UTCTime Day
da DiffTime
ta) == :: UTCTime -> UTCTime -> Bool
== (UTCTime Day
db DiffTime
tb) = (Day
da Day -> Day -> Bool
forall a. Eq a => a -> a -> Bool
== Day
db) Bool -> Bool -> Bool
&& (DiffTime
ta DiffTime -> DiffTime -> Bool
forall a. Eq a => a -> a -> Bool
== DiffTime
tb)

instance Ord UTCTime where
    compare :: UTCTime -> UTCTime -> Ordering
compare (UTCTime Day
da DiffTime
ta) (UTCTime Day
db DiffTime
tb) = case (Day -> Day -> Ordering
forall a. Ord a => a -> a -> Ordering
compare Day
da Day
db) of
        Ordering
EQ -> DiffTime -> DiffTime -> Ordering
forall a. Ord a => a -> a -> Ordering
compare DiffTime
ta DiffTime
tb
        Ordering
cmp -> Ordering
cmp