time-1.1.3: A time library Source code Contents Index

Data.Time.Calendar

Contents Days Gregorian calendar

Synopsis

newtype Day = ModifiedJulianDay { toModifiedJulianDay :: Integer } addDays :: Integer -> Day -> Day diffDays :: Day -> Day -> Integer toGregorian :: Day -> (Integer, Int, Int) fromGregorian :: Integer -> Int -> Int -> Day showGregorian :: Day -> String gregorianMonthLength :: Integer -> Int -> Int addGregorianMonthsClip :: Integer -> Day -> Day addGregorianMonthsRollOver :: Integer -> Day -> Day addGregorianYearsClip :: Integer -> Day -> Day addGregorianYearsRollOver :: Integer -> Day -> Day isLeapYear :: Integer -> Bool

Days

newtype Day Source

The Modified Julian Day is a standard count of days, with zero being the day 1858-11-17. Constructors ModifiedJulianDay toModifiedJulianDay :: Integer Instances Enum Day Eq Day Ord Day Read Day Show Day Ix Day Typeable Day ParseTime Day FormatTime Day

addDays :: Integer -> Day -> Day Source

diffDays :: Day -> Day -> Integer Source

Gregorian calendar

toGregorian :: Day -> (Integer, Int, Int) Source

convert to proleptic Gregorian calendar. First element of result is year, second month number (1-12), third day (1-31).

fromGregorian :: Integer -> Int -> Int -> Day Source

convert from proleptic Gregorian calendar. First argument is year, second month number (1-12), third day (1-31). Invalid values will be clipped to the correct range, month first, then day.

showGregorian :: Day -> String Source

show in ISO 8601 format (yyyy-mm-dd)

gregorianMonthLength :: Integer -> Int -> Int Source

The number of days in a given month according to the proleptic Gregorian calendar. First argument is year, second is month.

addGregorianMonthsClip :: Integer -> Day -> Day Source

Add months, with days past the last day of the month clipped to the last day. For instance, 2005-01-30 + 1 month = 2005-02-28.

addGregorianMonthsRollOver :: Integer -> Day -> Day Source

Add months, with days past the last day of the month rolling over to the next month. For instance, 2005-01-30 + 1 month = 2005-03-02.

addGregorianYearsClip :: Integer -> Day -> Day Source

Add years, matching month and day, with Feb 29th clipped to Feb 28th if necessary. For instance, 2004-02-29 + 2 years = 2006-02-28.

addGregorianYearsRollOver :: Integer -> Day -> Day Source

Add years, matching month and day, with Feb 29th rolled over to Mar 1st if necessary. For instance, 2004-02-29 + 2 years = 2006-03-01.

isLeapYear :: Integer -> Bool Source

Is this year a leap year according to the proleptic Gregorian calendar?

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