You will find a discussion here Find and check timestamps of files. The answer is basically

$mod = (stat "$path/$filename")[9];
 
# this prints result in usual date format
# like -> Tue Jun 12 23:50:10 2001

print scalar localtime $mod;
[download]

If you use Super Search you will find heaps of examples on this topic floating around the monastery. This is also in the Perl FAQ at How do I get a file's timestamp in perl?. If you have not discoverd the Perl FAQ you are missing out on heaps of goodies.

cheers

tachyon