| Safe Haskell | None |
|---|
Data.Time.Calendar
Contents
- newtype Day = ModifiedJulianDay {}
- addDays :: Integer -> Day -> Day
- diffDays :: Day -> Day -> Integer
- toGregorian :: Day -> (Integer, Int, Int)
- fromGregorian :: Integer -> Int -> Int -> Day
- fromGregorianValid :: Integer -> Int -> Int -> Maybe 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
The Modified Julian Day is a standard count of days, with zero being the day 1858-11-17.
Constructors
| ModifiedJulianDay | |
Fields | |
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 -> DaySource
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.
fromGregorianValid :: Integer -> Int -> Int -> Maybe DaySource
convert from proleptic Gregorian calendar. First argument is year, second month number (1-12), third day (1-31). Invalid values will return Nothing
showGregorian :: Day -> StringSource
show in ISO 8601 format (yyyy-mm-dd)
gregorianMonthLength :: Integer -> Int -> IntSource
The number of days in a given month according to the proleptic Gregorian calendar. First argument is year, second is month.
addGregorianMonthsClip :: Integer -> Day -> DaySource
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 -> DaySource
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 -> DaySource
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 -> DaySource
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 -> BoolSource
Is this year a leap year according to the proleptic Gregorian calendar?