- m <- case w3cMonth w3c of
- Just m -> return m
- Nothing -> convError "No month info" w3c
- d <- case w3cDay w3c of
- Just d -> return d
- Nothing -> convError "No day info" w3c
- return $ fromGregorian y m d
\ No newline at end of file
+ m <- fetch "month" w3cMonth w3c
+ d <- fetch "day" w3cDay w3c
+ return (fromGregorian y m d)
+
+instance Convertible UTCTime W3CDateTime where
+ safeConvert u
+ = let (y, m, d) = toGregorian (utctDay u)
+ hms = timeToTimeOfDay (utctDayTime u)
+ in
+ return W3CDateTime {
+ w3cYear = y
+ , w3cMonth = Just m
+ , w3cDay = Just d
+ , w3cHour = Just (todHour hms)
+ , w3cMinute = Just (todMin hms)
+ , w3cSecond = Just (todSec hms)
+ , w3cTimeZone = Just utc
+ }
+
+instance Convertible W3CDateTime UTCTime where
+ safeConvert w3c
+ = do day <- safeConvert w3c
+ tod <- do h <- fetch "hour" w3cHour w3c
+ m <- fetch "minute" w3cMinute w3c
+ s <- fetch "second" w3cSecond w3c
+ case makeTimeOfDayValid h m s of
+ Just tod -> return tod
+ Nothing -> convError "Invalid time of day" w3c
+ tz <- fetch "timezone" w3cTimeZone w3c
+ let lt = LocalTime day tod
+ return (localTimeToUTC tz lt)