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Language  Haskell2010 
Types and functions for UTC and UT1
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.
ModJulianDate  
Fields 
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.
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 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 No table of these corrections is provided, as any program compiled with it would become out of date in six months.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.
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.
UTCTime  
Fields

Eq UTCTime  
Data UTCTime  
Defined in Data.Time.Clock.Internal.UTCTime Methodsgfoldl :: (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  
Defined in Data.Time.Clock.Internal.UTCTime  
Read UTCTime  
Show UTCTime  
NFData UTCTime  
Defined in Data.Time.Clock.Internal.UTCTime  
ParseTime UTCTime  
Defined in Data.Time.Format.Parse  
FormatTime UTCTime  
Defined in Data.Time.Format MethodsformatCharacter :: Char > Maybe (TimeLocale > Maybe NumericPadOption > Maybe Int > UTCTime > String) Source 
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 leapseconds, 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 leapsecond intervened.
nominalDay :: NominalDiffTime Source
One day in NominalDiffTime
.
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
© The University of Glasgow and others
Licensed under a BSDstyle license (see top of the page).
https://downloads.haskell.org/~ghc/8.6.1/docs/html/libraries/time1.8.0.2/DataTimeClock.html