knoppix@Microknoppix:~$ ls -l xxx
-rw-r--r-- 1 knoppix knoppix 11 Jul 30 00:01 xxx
knoppix@Microknoppix:~$ perl -MPOSIX=strftime -E '
> say strftime q{%c}, localtime( ( stat q{xxx} )[ 9 ] );'
Sat 30 Jul 2011 00:01:18 UTC
knoppix@Microknoppix:~$