Safe Haskell	None

Penny.Lincoln.Bits.DateTime

Synopsis

Documentation

data TimeZoneOffset Source

The number of minutes that this timezone is offset from UTC. Can be positive, negative, or zero.

Instances

Eq TimeZoneOffset
Ord TimeZoneOffset
Show TimeZoneOffset

minsToOffset :: Int -> Maybe TimeZoneOffset Source

Convert minutes to a time zone offset. I'm having a hard time deciding whether to be liberal or strict in what to accept here. Currently it is somewhat strict in that it will fail if absolute value is greater than 840 minutes; currently the article at http:en.wikipedia.orgwikiList_of_time_zones_by_UTC_offset says there is no offset greater than 14 hours, or 840 minutes.

noOffset :: TimeZoneOffset Source

data Hours Source

Instances

Eq Hours
Ord Hours
Show Hours

intToHours :: Int -> Maybe Hours Source

succeeds if 0 <= x < 24

zeroHours :: Hours Source

data Minutes Source

Instances

Eq Minutes
Ord Minutes
Show Minutes

intToMinutes :: Int -> Maybe Minutes Source

succeeds if 0 <= x < 60

zeroMinutes :: Minutes Source

data Seconds Source

Instances

Eq Seconds
Ord Seconds
Show Seconds

intToSeconds :: Int -> Maybe Seconds Source

succeeds if 0 <= x < 61 (to allow for leap seconds)

zeroSeconds :: Seconds Source

midnight :: (Hours, Minutes, Seconds)Source

data DateTime Source

A DateTime is a a local date and time, along with a time zone offset. The Eq and Ord instances are derived; therefore, two DateTime instances will not be equivalent if the time zone offsets are different, even if they are the same instant. To compare one DateTime to another, you probably want to use toUTC and compare those. To see if two DateTime are the same instant, use sameInstant.

Constructors

DateTime
Fields day :: Day hours :: Hours minutes :: Minutes seconds :: Seconds timeZone :: TimeZoneOffset

Instances

Eq DateTime
Ord DateTime
Show DateTime

dateTimeMidnightUTC :: Day -> DateTime Source

toUTC :: DateTime -> UTCTime Source

toZonedTime :: DateTime -> ZonedTime Source

fromZonedTime :: ZonedTime -> Maybe DateTime Source

sameInstant :: DateTime -> DateTime -> Bool Source

Are these DateTimes the same instant in time, after adjusting for local timezones?

showDateTime :: DateTime -> String Source

Shows a DateTime in a pretty way.