time-1.11.1.1: A time library
Safe HaskellSafe
LanguageHaskell2010

Data.Time.Clock

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

Instances details
Eq UniversalTime # 
Instance details

Defined in Data.Time.Clock.Internal.UniversalTime

Data UniversalTime # 
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 :: forall r r'. (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 # 
Instance details

Defined in Data.Time.Clock.Internal.UniversalTime

Read UniversalTime # 
Instance details

Defined in Data.Time.Format.Parse

Show UniversalTime # 
Instance details

Defined in Data.Time.LocalTime.Internal.LocalTime

NFData UniversalTime # 
Instance details

Defined in Data.Time.Clock.Internal.UniversalTime

Methods

rnf :: UniversalTime -> () Source #

ParseTime UniversalTime # 
Instance details

Defined in Data.Time.Format.Parse.Instances

FormatTime UniversalTime # 
Instance details

Defined in Data.Time.Format.Format.Instances

Methods

formatCharacter :: Bool -> Char -> Maybe (FormatOptions -> UniversalTime -> String) Source #

Absolute intervals

data DiffTime Source #

This is a length of time, as measured by a clock. Conversion functions such as fromInteger and realToFrac will treat it as seconds. For example, (0.010 :: DiffTime) corresponds to 10 milliseconds.

It has a precision of one picosecond (= 10^-12 s). Enumeration functions will treat it as picoseconds.

Instances

Instances details
Enum DiffTime # 
Instance details

Defined in Data.Time.Clock.Internal.DiffTime

Eq DiffTime # 
Instance details

Defined in Data.Time.Clock.Internal.DiffTime

Fractional DiffTime # 
Instance details

Defined in Data.Time.Clock.Internal.DiffTime

Data DiffTime # 
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 :: forall r r'. (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 # 
Instance details

Defined in Data.Time.Clock.Internal.DiffTime

Ord DiffTime # 
Instance details

Defined in Data.Time.Clock.Internal.DiffTime

Read DiffTime # 
Instance details

Defined in Data.Time.Clock.Internal.DiffTime

Real DiffTime # 
Instance details

Defined in Data.Time.Clock.Internal.DiffTime

RealFrac DiffTime # 
Instance details

Defined in Data.Time.Clock.Internal.DiffTime

Show DiffTime # 
Instance details

Defined in Data.Time.Clock.Internal.DiffTime

NFData DiffTime # 
Instance details

Defined in Data.Time.Clock.Internal.DiffTime

Methods

rnf :: DiffTime -> () Source #

ParseTime DiffTime # 
Instance details

Defined in Data.Time.Format.Parse.Instances

FormatTime DiffTime # 
Instance details

Defined in Data.Time.Format.Format.Instances

Methods

formatCharacter :: Bool -> Char -> Maybe (FormatOptions -> DiffTime -> String) 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

Instances details
Eq UTCTime # 
Instance details

Defined in Data.Time.Clock.Internal.UTCTime

Methods

(==) :: UTCTime -> UTCTime -> Bool #

(/=) :: UTCTime -> UTCTime -> Bool #

Data UTCTime # 
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 :: forall r r'. (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 # 
Instance details

Defined in Data.Time.Clock.Internal.UTCTime

Read UTCTime # 
Instance details

Defined in Data.Time.Format.Parse

Show UTCTime # 
Instance details

Defined in Data.Time.LocalTime.Internal.ZonedTime

NFData UTCTime # 
Instance details

Defined in Data.Time.Clock.Internal.UTCTime

Methods

rnf :: UTCTime -> () Source #

ParseTime UTCTime # 
Instance details

Defined in Data.Time.Format.Parse.Instances

FormatTime UTCTime # 
Instance details

Defined in Data.Time.Format.Format.Instances

Methods

formatCharacter :: Bool -> Char -> Maybe (FormatOptions -> UTCTime -> String) Source #

ISO8601 UTCTime #

yyyy-mm-ddThh:mm:ss[.sss]Z (ISO 8601:2004(E) sec. 4.3.2 extended format)

Instance details

Defined in Data.Time.Format.ISO8601

data NominalDiffTime Source #

This is a length of time, as measured by UTC. It has a precision of 10^-12 s.

Conversion functions such as fromInteger and realToFrac will treat it as seconds. For example, (0.010 :: NominalDiffTime) corresponds to 10 milliseconds.

It has a precision of one picosecond (= 10^-12 s). Enumeration functions will treat it as picoseconds.

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

Instances details
Enum NominalDiffTime # 
Instance details

Defined in Data.Time.Clock.Internal.NominalDiffTime

Eq NominalDiffTime # 
Instance details

Defined in Data.Time.Clock.Internal.NominalDiffTime

Fractional NominalDiffTime # 
Instance details

Defined in Data.Time.Clock.Internal.NominalDiffTime

Data NominalDiffTime # 
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 :: forall r r'. (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 # 
Instance details

Defined in Data.Time.Clock.Internal.NominalDiffTime

Ord NominalDiffTime # 
Instance details

Defined in Data.Time.Clock.Internal.NominalDiffTime

Read NominalDiffTime # 
Instance details

Defined in Data.Time.Clock.Internal.NominalDiffTime

Real NominalDiffTime # 
Instance details

Defined in Data.Time.Clock.Internal.NominalDiffTime

RealFrac NominalDiffTime # 
Instance details

Defined in Data.Time.Clock.Internal.NominalDiffTime

Show NominalDiffTime # 
Instance details

Defined in Data.Time.Clock.Internal.NominalDiffTime

NFData NominalDiffTime # 
Instance details

Defined in Data.Time.Clock.Internal.NominalDiffTime

Methods

rnf :: NominalDiffTime -> () Source #

ParseTime NominalDiffTime # 
Instance details

Defined in Data.Time.Format.Parse.Instances

FormatTime NominalDiffTime # 
Instance details

Defined in Data.Time.Format.Format.Instances

Methods

formatCharacter :: Bool -> Char -> Maybe (FormatOptions -> NominalDiffTime -> String) Source #

secondsToNominalDiffTime :: Pico -> NominalDiffTime Source #

Create a NominalDiffTime from a number of seconds.

Since: time-1.9.1

nominalDiffTimeToSeconds :: NominalDiffTime -> Pico Source #

Get the seconds in a NominalDiffTime.

Since: time-1.9.1

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. On UNIX systems this uses clock_getres, which may be wrong on WSL2.