time-1.6: 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 # 
Data 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 # 
NFData UniversalTime # 

Methods

rnf :: UniversalTime -> () Source #

ParseTime UniversalTime # 
FormatTime UniversalTime # 

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 # 
Eq DiffTime # 
Fractional DiffTime # 
Data 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 # 
Ord DiffTime # 
Real DiffTime # 
RealFrac DiffTime # 
Show DiffTime # 
NFData 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 # 

Methods

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

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

Data 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 # 
NFData UTCTime # 

Methods

rnf :: UTCTime -> () Source #

ParseTime UTCTime # 
FormatTime UTCTime # 

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 # 
Eq NominalDiffTime # 
Fractional NominalDiffTime # 
Data 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 # 
Ord NominalDiffTime # 
Real NominalDiffTime # 
RealFrac NominalDiffTime # 
Show NominalDiffTime # 
NFData 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 UTC time from the system clock.