time-1.8.0.2: A time library

Safe HaskellSafe
LanguageHaskell2010

Data.Time.Clock

Contents

Description

Types and functions for UTC and UT1

Synopsis

Universal Time

Time as measured by the Earth.

newtype UniversalTime Source #

The Modified Julian Date is the day with the fraction of the day, measured from UT midnight. It's used to represent UT1, which is time as measured by the earth's rotation, adjusted for various wobbles.

Constructors

ModJulianDate 
Instances
Eq UniversalTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.UniversalTime

Data UniversalTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.UniversalTime

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> UniversalTime -> c UniversalTime Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c UniversalTime Source #

toConstr :: UniversalTime -> Constr Source #

dataTypeOf :: UniversalTime -> DataType Source #

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c UniversalTime) Source #

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c UniversalTime) Source #

gmapT :: (forall b. Data b => b -> b) -> UniversalTime -> UniversalTime Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> UniversalTime -> r Source #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> UniversalTime -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> UniversalTime -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> UniversalTime -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> UniversalTime -> m UniversalTime Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> UniversalTime -> m UniversalTime Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> UniversalTime -> m UniversalTime Source #

Ord UniversalTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.UniversalTime

Read UniversalTime Source # 
Instance details

Defined in Data.Time.Format.Parse

Show UniversalTime Source # 
Instance details

Defined in Data.Time.LocalTime.Internal.LocalTime

NFData UniversalTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.UniversalTime

Methods

rnf :: UniversalTime -> () Source #

ParseTime UniversalTime Source # 
Instance details

Defined in Data.Time.Format.Parse

FormatTime UniversalTime Source # 
Instance details

Defined in Data.Time.Format

Absolute intervals

data DiffTime Source #

This is a length of time, as measured by a clock. Conversion functions will treat it as seconds. It has a precision of 10^-12 s.

Instances
Enum DiffTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.DiffTime

Eq DiffTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.DiffTime

Fractional DiffTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.DiffTime

Data DiffTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.DiffTime

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> DiffTime -> c DiffTime Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c DiffTime Source #

toConstr :: DiffTime -> Constr Source #

dataTypeOf :: DiffTime -> DataType Source #

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c DiffTime) Source #

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c DiffTime) Source #

gmapT :: (forall b. Data b => b -> b) -> DiffTime -> DiffTime Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> DiffTime -> r Source #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> DiffTime -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> DiffTime -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> DiffTime -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> DiffTime -> m DiffTime Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> DiffTime -> m DiffTime Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> DiffTime -> m DiffTime Source #

Num DiffTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.DiffTime

Ord DiffTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.DiffTime

Real DiffTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.DiffTime

RealFrac DiffTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.DiffTime

Show DiffTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.DiffTime

NFData DiffTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.DiffTime

Methods

rnf :: DiffTime -> () Source #

secondsToDiffTime :: Integer -> DiffTime Source #

Create a DiffTime which represents an integral number of seconds.

picosecondsToDiffTime :: Integer -> DiffTime Source #

Create a DiffTime from a number of picoseconds.

diffTimeToPicoseconds :: DiffTime -> Integer Source #

Get the number of picoseconds in a DiffTime.

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.

data UTCTime Source #

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.

Constructors

UTCTime 

Fields

Instances
Eq UTCTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.UTCTime

Data UTCTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.UTCTime

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> UTCTime -> c UTCTime Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c UTCTime Source #

toConstr :: UTCTime -> Constr Source #

dataTypeOf :: UTCTime -> DataType Source #

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c UTCTime) Source #

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c UTCTime) Source #

gmapT :: (forall b. Data b => b -> b) -> UTCTime -> UTCTime Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> UTCTime -> r Source #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> UTCTime -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> UTCTime -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> UTCTime -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> UTCTime -> m UTCTime Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> UTCTime -> m UTCTime Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> UTCTime -> m UTCTime Source #

Ord UTCTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.UTCTime

Read UTCTime Source # 
Instance details

Defined in Data.Time.Format.Parse

Show UTCTime Source # 
Instance details

Defined in Data.Time.LocalTime.Internal.ZonedTime

NFData UTCTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.UTCTime

Methods

rnf :: UTCTime -> () Source #

ParseTime UTCTime Source # 
Instance details

Defined in Data.Time.Format.Parse

FormatTime UTCTime Source # 
Instance details

Defined in Data.Time.Format

data NominalDiffTime Source #

This is a length of time, as measured by UTC. Conversion functions will treat it as seconds. It has a precision of 10^-12 s. It ignores leap-seconds, so it's not necessarily a fixed amount of clock time. For instance, 23:00 UTC + 2 hours of NominalDiffTime = 01:00 UTC (+ 1 day), regardless of whether a leap-second intervened.

Instances
Enum NominalDiffTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.NominalDiffTime

Eq NominalDiffTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.NominalDiffTime

Fractional NominalDiffTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.NominalDiffTime

Data NominalDiffTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.NominalDiffTime

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> NominalDiffTime -> c NominalDiffTime Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c NominalDiffTime Source #

toConstr :: NominalDiffTime -> Constr Source #

dataTypeOf :: NominalDiffTime -> DataType Source #

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c NominalDiffTime) Source #

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c NominalDiffTime) Source #

gmapT :: (forall b. Data b => b -> b) -> NominalDiffTime -> NominalDiffTime Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> NominalDiffTime -> r Source #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> NominalDiffTime -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> NominalDiffTime -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> NominalDiffTime -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> NominalDiffTime -> m NominalDiffTime Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> NominalDiffTime -> m NominalDiffTime Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> NominalDiffTime -> m NominalDiffTime Source #

Num NominalDiffTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.NominalDiffTime

Ord NominalDiffTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.NominalDiffTime

Real NominalDiffTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.NominalDiffTime

RealFrac NominalDiffTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.NominalDiffTime

Show NominalDiffTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.NominalDiffTime

NFData NominalDiffTime Source # 
Instance details

Defined in Data.Time.Clock.Internal.NominalDiffTime

Methods

rnf :: NominalDiffTime -> () Source #

addUTCTime :: NominalDiffTime -> UTCTime -> UTCTime Source #

addUTCTime a b = a + b

diffUTCTime :: UTCTime -> UTCTime -> NominalDiffTime Source #

diffUTCTime a b = a - b

getCurrentTime :: IO UTCTime Source #

Get the current UTCTime from the system clock.

getTime_resolution :: DiffTime Source #

The resolution of getSystemTime, getCurrentTime, getPOSIXTime