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Use the 'utime' function to change the timestamp of a file.

'utime' needs at least 3 parameters; the first 2 parameters must be the access and modification time respectively (in seconds, as returned by the 'time' function), the rest of the parameters are the files you want to change.

Example:

#-- change timestamp to current time
$current = time;
utime $current, $current, "file1.txt", "file2.txt";