Difference between revisions of "Unix tools/Date"

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Example use of the System.Time library.
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<haskell>
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--
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-- Implement the unix 'date' command in Haskell
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--
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import System.IO
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import System.Time
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import System.Locale
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import System.Environment
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main = do
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[s] <- getArgs
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time <- getClockTime >>= toCalendarTime
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putStrLn $ formatCalendarTime defaultTimeLocale s time
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</haskell>
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Running this code:
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<haskell>
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$ ghc -O A.hs
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$ ./a.out "%a %b %e %H:%M:%S %Z %Y"
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Thu Dec 14 12:09:02 EST 2006
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$ ./a.out "%y-%m-%d"
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06-12-14
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</haskell>
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[[Category:Code]]
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[[Category:Tutorials]]

Latest revision as of 15:19, 6 February 2021

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