Difference between revisions of "Unix tools/Date"
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| + | Example use of the System.Time library. | ||
| + | <haskell> | ||
| + | -- | ||
| + | -- 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 | ||
| + | </haskell> | ||
| + | |||
| + | Running this code: | ||
| + | |||
| + | <haskell> | ||
| + | $ 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 | ||
| + | </haskell> | ||
| + | |||
| + | [[Category:Code]] | ||
| + | [[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