45 lines
1.1 KiB
Haskell
45 lines
1.1 KiB
Haskell
{- timestamp parsing and formatting
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-
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- Copyright 2015-2016 Joey Hess <id@joeyh.name>
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-
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- License: BSD-2-clause
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-}
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{-# LANGUAGE CPP #-}
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module Utility.TimeStamp where
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import Utility.PartialPrelude
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import Utility.Misc
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import Data.Time.Clock.POSIX
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import Data.Time
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import Data.Ratio
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#if ! MIN_VERSION_time(1,5,0)
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import System.Locale
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#endif
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{- Parses how POSIXTime shows itself: "1431286201.113452s"
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- Also handles the format with no fractional seconds. -}
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parsePOSIXTime :: String -> Maybe POSIXTime
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parsePOSIXTime = uncurry parsePOSIXTime' . separate (== '.')
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{- Parses the integral and decimal part of a POSIXTime -}
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parsePOSIXTime' :: String -> String -> Maybe POSIXTime
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parsePOSIXTime' sn sd = do
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n <- fromIntegral <$> readi sn
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let sd' = takeWhile (/= 's') sd
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if null sd'
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then return n
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else do
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d <- readi sd'
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let r = d % (10 ^ (length sd'))
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return $ if n < 0
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then n - fromRational r
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else n + fromRational r
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where
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readi :: String -> Maybe Integer
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readi = readish
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formatPOSIXTime :: String -> POSIXTime -> String
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formatPOSIXTime fmt t = formatTime defaultTimeLocale fmt (posixSecondsToUTCTime t)
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