haskell - haskell，如何将 POSIXTime 类型转换为字符串

Question

Prelude> import Data.Time.Clock.POSIX (getPOSIXTime)
Prelude Data.Time.Clock.POSIX> ptime <- getPOSIXTime
Prelude Data.Time.Clock.POSIX> ptime
1360059876.245525s
Prelude Data.Time.Clock.POSIX> :t ptime
ptime :: Data.Time.Clock.POSIX.POSIXTime
Prelude Data.Time.Clock.POSIX> 

我想将 ptime 转换为字符串类型，怎么做？

Answer 1

posixSecondsToUTCTime在 Data.Time.Clock.POSIX 中也使用将 转换POSIXTime为UTCTime; 然后formatTime从 Data.Time.Format 将其格式化UTCTime为String.

例如

formatTime defaultTimeLocale "%FT%T" (posixSecondsToUTCTime ptime)
-- ^ ISO 8601
formatTime defaultTimeLocale "%s%Qs" (posixSecondsToUTCTime ptime)
-- ^ fractional seconds since the epoch (but see caveat noted in documentation)

（defaultTimeLocale来自 System.Locale。）