Edit date and time query

I'm using the following line in a hack I wrote that I am rewriting and I need to know how I can pull out the $post[editdate] and $post[edittime] in the editpost.php. I think the editedbysql handles that but when I use this code, it doesn't pull anything out. Could it be because I am an Admin and I have the editedby turned off for Admins?

PHP Code:

$updatedate="Last edited: $post[editdate] at $post[edittime] by $edituser[username]"; 

[pawel]

Which pages do you want to put these variables on?

[Boofo]

I want this to show up in the message that has been edited. I have the code I have done so far if you would like to see it. I can pm it if that will work.