The previous one is not working properly (maroon actually told me it wasn't going to work that way but I forgot I guess), it's not showing "yyyy/mm/dd" so, this one works just fine:

Code
on *:TEXT:*:#:{
  if ($me isin $strip($1-)) {
    echo -dt $+ $msgstamp $+($chr(3),4,#,$chr(3) < $+ $chr(3),2,$nick,$chr(3),> $chr(3),7,$1-)
  }
}