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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
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

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.

fromGregorianValid :: Integer -> Int -> Int -> Maybe Day | Source

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 -> 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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