Safe Haskell	Safe
Language	Haskell2010

Data.Time.Clock.System

Description

Fast access to the system clock.

Synopsis

systemEpochDay :: Day
data SystemTime = MkSystemTime {
- systemSeconds :: !Int64
- systemNanoseconds :: !Word32
}
truncateSystemTimeLeapSecond :: SystemTime -> SystemTime
getSystemTime :: IO SystemTime
systemToUTCTime :: SystemTime -> UTCTime
utcToSystemTime :: UTCTime -> SystemTime
systemToTAITime :: SystemTime -> AbsoluteTime

Documentation

systemEpochDay :: Day Source #

The day of the epoch of SystemTime, 1970-01-01

data SystemTime Source #

SystemTime is time returned by system clock functions. Its semantics depends on the clock function, but the epoch is typically the beginning of 1970. Note that systemNanoseconds of 1E9 to 2E9-1 can be used to represent leap seconds.

Constructors

MkSystemTime
Fields systemSeconds :: !Int64 systemNanoseconds :: !Word32

Instances

Eq SystemTime Source #
Instance details Defined in Data.Time.Clock.Internal.SystemTime Methods (==) :: SystemTime -> SystemTime -> Bool # (/=) :: SystemTime -> SystemTime -> Bool #
Ord SystemTime Source #
Instance details Defined in Data.Time.Clock.Internal.SystemTime Methods compare :: SystemTime -> SystemTime -> Ordering # (<) :: SystemTime -> SystemTime -> Bool # (<=) :: SystemTime -> SystemTime -> Bool # (>) :: SystemTime -> SystemTime -> Bool # (>=) :: SystemTime -> SystemTime -> Bool # max :: SystemTime -> SystemTime -> SystemTime # min :: SystemTime -> SystemTime -> SystemTime #
Show SystemTime Source #
Instance details Defined in Data.Time.Clock.Internal.SystemTime Methods showsPrec :: Int -> SystemTime -> ShowS # show :: SystemTime -> String # showList :: [SystemTime] -> ShowS #
NFData SystemTime Source #
Instance details Defined in Data.Time.Clock.Internal.SystemTime Methods rnf :: SystemTime -> () #

truncateSystemTimeLeapSecond :: SystemTime -> SystemTime Source #

Map leap-second values to the start of the following second. The resulting systemNanoseconds will always be in the range 0 to 1E9-1.

getSystemTime :: IO SystemTime Source #

Get the system time, epoch start of 1970 UTC, leap-seconds ignored. getSystemTime is typically much faster than getCurrentTime.

systemToUTCTime :: SystemTime -> UTCTime Source #

Convert SystemTime to UTCTime, matching zero SystemTime to midnight of systemEpochDay UTC.

utcToSystemTime :: UTCTime -> SystemTime Source #

Convert UTCTime to SystemTime, matching zero SystemTime to midnight of systemEpochDay UTC.

systemToTAITime :: SystemTime -> AbsoluteTime Source #

Convert SystemTime to AbsoluteTime, matching zero SystemTime to midnight of systemEpochDay TAI.