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Unix tools/Date

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Example use of the System.Time library. 

--
-- Implement the unix 'date' command in Haskell
--
 
import System.IO
import System.Time
import System.Locale
import System.Environment
 
main = do
    [s]  <- getArgs
    time <- getClockTime >>= toCalendarTime
    putStrLn $ formatCalendarTime defaultTimeLocale s time

Running this code: 

$ ghc -O A.hs
 
$ ./a.out "%a %b %e %H:%M:%S %Z %Y"
Thu Dec 14 12:09:02 EST 2006
 
$ ./a.out "%y-%m-%d"               
06-12-14
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