[GHC] #1486: utcToLocalTime converting in the wrong direction on Windows

[GHC]

#1486: utcToLocalTime converting in the wrong direction on Windows
--------------------------------+-------------------------------------------
  Reporter:  Olivier Boudry     |          Owner:         
      Type:  bug                |         Status:  new    
  Priority:  normal             |      Milestone:         
 Component:  libraries (other)  |        Version:  6.6.1  
  Severity:  normal             |       Keywords:         
Difficulty:  Unknown            |             Os:  Windows
  Testcase:                     |   Architecture:  x86    
--------------------------------+-------------------------------------------
I found a strange UTC to Local Time conversion bug on the Windows version
 of GHC 6.6.1.

 Code to reproduce it:

     import Monad
     import Data.Time
     import Locale

     main = do
         t <- (liftM2 utcToLocalTime) getCurrentTimeZone getCurrentTime
         let s = formatTime defaultTimeLocale "%r" t
         putStrLn s
         z <- (liftM timeZoneName) getCurrentTimeZone
         putStrLn z

 Running this program around 04:35 PM I get the following results

 On Linux (a recent Ubuntu with GHC 6.6.1 compiled from source)

 04:35:48 PM
 EDT

 On Windows (GHC 6.6.1 from installer) I get

 12:36:04 AM
 Eastern Daylight Time

 Looks like the Windows version is counting in the wrong direction. I made
 some tests in GHCi on both machines an get this:

 On Windows:
 Prelude> :m Monad Data.Time Locale
 Prelude Locale Data.Time Monad> z <- getCurrentTimeZone
 Eastern Daylight Time
 Prelude Locale Data.Time Monad> timeZoneMinutes z
 240

 On Linux: (same commands)
 Prelude Locale Data.Time Monad> timeZoneMinutes z
 -240

 Cheers,

 Olivier.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1486>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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