time-1.4.2: A time library

Safe HaskellSafe-Inferred

Data.Time.LocalTime

Contents

Synopsis

Time zones

data TimeZone Source

A TimeZone is a whole number of minutes offset from UTC, together with a name and a "just for summer" flag.

Constructors

TimeZone 

Fields

timeZoneMinutes :: Int

The number of minutes offset from UTC. Positive means local time will be later in the day than UTC.

timeZoneSummerOnly :: Bool

Is this time zone just persisting for the summer?

timeZoneName :: String

The name of the zone, typically a three- or four-letter acronym.

timeZoneOffsetString :: TimeZone -> StringSource

Text representing the offset of this timezone, such as "-0800" or "+0400" (like %z in formatTime)

timeZoneOffsetString' :: NumericPadOption -> TimeZone -> StringSource

Text representing the offset of this timezone, such as "-0800" or "+0400" (like %z in formatTime), with arbitrary padding

minutesToTimeZone :: Int -> TimeZoneSource

Create a nameless non-summer timezone for this number of minutes

hoursToTimeZone :: Int -> TimeZoneSource

Create a nameless non-summer timezone for this number of hours

utc :: TimeZoneSource

The UTC time zone

getTimeZone :: UTCTime -> IO TimeZoneSource

Get the local time-zone for a given time (varying as per summertime adjustments)

getCurrentTimeZone :: IO TimeZoneSource

Get the current time-zone

Time of day

data TimeOfDay Source

Time of day as represented in hour, minute and second (with picoseconds), typically used to express local time of day.

Constructors

TimeOfDay 

Fields

todHour :: Int

range 0 - 23

todMin :: Int

range 0 - 59

todSec :: Pico

Note that 0 <= todSec < 61, accomodating leap seconds. Any local minute may have a leap second, since leap seconds happen in all zones simultaneously

midday :: TimeOfDaySource

Hour twelve

utcToLocalTimeOfDay :: TimeZone -> TimeOfDay -> (Integer, TimeOfDay)Source

Convert a ToD in UTC to a ToD in some timezone, together with a day adjustment.

localToUTCTimeOfDay :: TimeZone -> TimeOfDay -> (Integer, TimeOfDay)Source

Convert a ToD in some timezone to a ToD in UTC, together with a day adjustment.

timeToTimeOfDay :: DiffTime -> TimeOfDaySource

Get a TimeOfDay given a time since midnight. Time more than 24h will be converted to leap-seconds.

timeOfDayToTime :: TimeOfDay -> DiffTimeSource

Find out how much time since midnight a given TimeOfDay is.

dayFractionToTimeOfDay :: Rational -> TimeOfDaySource

Get a TimeOfDay given the fraction of a day since midnight.

timeOfDayToDayFraction :: TimeOfDay -> RationalSource

Get the fraction of a day since midnight given a TimeOfDay.

Local Time

data LocalTime Source

A simple day and time aggregate, where the day is of the specified parameter, and the time is a TimeOfDay. Conversion of this (as local civil time) to UTC depends on the time zone. Conversion of this (as local mean time) to UT1 depends on the longitude.

Constructors

LocalTime 

utcToLocalTime :: TimeZone -> UTCTime -> LocalTimeSource

show a UTC time in a given time zone as a LocalTime

localTimeToUTC :: TimeZone -> LocalTime -> UTCTimeSource

find out what UTC time a given LocalTime in a given time zone is

ut1ToLocalTime :: Rational -> UniversalTime -> LocalTimeSource

1st arg is observation meridian in degrees, positive is East

localTimeToUT1 :: Rational -> LocalTime -> UniversalTimeSource

1st arg is observation meridian in degrees, positive is East