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Module: Directory
Function: getModificationTime
Type: FilePath -> IO ClockTime
Description: returns the clock time at which the file/directory was last modified
Related:

Example 1
Program source: 

import IO
import Directory

main = do x <- getModificationTime "/tmp/foo.txt"
	  print x
          hdl <- openFile "/tmp/foo.txt" AppendMode
	  hPutStr hdl "Hello"
	  hClose hdl
	  y <- getModificationTime "/tmp/foo.txt"
	  print y

Output: Tue Apr 16 08:34:03 GMT 2002

Output: Tue Apr 16 08:37:17 GMT 2002