AIX

pwdadm -q Username | grep lastupdate

perl -le 'print scalar localtime shift'

#! /bin/ksh
# This script reads a list of usernames from a file and applies your command

typeset fIn="$1"
typeset chUser=""

cat "$fIn" | sed 's/#.*$//;s/^[<spc><tab>][<spc><tab>]*//;s/[<spc><tab>][<spc><tab>]*$//;/^$/d' |\
while read chUser ; do
     pwdadm -q "$chUser" | grep lastupdate | perl -le 'print scalar localtime shift'
done

exit 0

for host in $(cat /home/user); do ssh $host 'hostname 1>&2; for user in $(cat /home/user/service_account); do sudo lsuser -a lastupdate $user | grep lastupdate; done'; done | perl -MPOSIX -e 'while (<STDIN>) { $_ =~ "^([^=]*)=(.*)\$"; print $1; print strftime(" %a %b %e %H:%M:%S %Y\n", localtime($2)); };'