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Add functions for modifying Date / Time parts of DateTime #50

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Merged
merged 1 commit into from
Mar 13, 2017
Merged

Add functions for modifying Date / Time parts of DateTime #50

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16 changes: 16 additions & 0 deletions src/Data/DateTime.purs
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Original file line number Diff line number Diff line change
@@ -1,7 +1,11 @@
module Data.DateTime
( DateTime(..)
, date
, modifyDate
, modifyDateF
, time
, modifyTime
, modifyTimeF
, adjust
, diff
, module Data.Date
Expand Down Expand Up @@ -35,9 +39,21 @@ instance showDateTime :: Show DateTime where
date :: DateTime -> Date
date (DateTime d _) = d

modifyDate :: (Date -> Date) -> DateTime -> DateTime
modifyDate f (DateTime d t) = DateTime (f d) t

modifyDateF :: forall f. Functor f => (Date -> f Date) -> DateTime -> f DateTime
modifyDateF f (DateTime d t) = flip DateTime t <$> f d

time :: DateTime -> Time
time (DateTime _ t) = t

modifyTime :: (Time -> Time) -> DateTime -> DateTime
modifyTime f (DateTime d t) = DateTime d (f t)

modifyTimeF :: forall f. Functor f => (Time -> f Time) -> DateTime -> f DateTime
modifyTimeF f (DateTime d t) = DateTime d <$> f t

-- | Adjusts a date/time value with a duration offset. `Nothing` is returned
-- | if the resulting date would be outside of the range of valid dates.
adjust :: forall d. Duration d => d -> DateTime -> Maybe DateTime
Expand Down