Finding last time users logged in

Here is a trick I picked up from Ygor:

#! /usr/bin/ksh

raw=1046099951
TIMESTAMP=$(perl -e '($ss, $mm, $hh, $DD, $MM, $YY) = localtime('$raw');
          printf "%04d%02d%02d%02d%02d", $YY + 1900 , $MM +1 , $DD, $hh, $mm')

echo $TIMESTAMP
exit 0