The only perl thing I can find is utime and all of the documentation I have seen on this tells how to modify existing times rather than retrieve existing times.
sugarkane
8:58 am on Apr 29, 2002 (gmt 0)
Check out the 'stat' function (perldoc -f stat). Briefly, it returns an array full of useful info about a file: [perl] @array=stat($filehandle); [/perl]
The modification time is stored in unix format in $array[9]