You might alread have a solution, but this worked for me.
I'm am also using a timestamp type in my db.
i wanted the date to look like this:
10/9/02
$date = date("m/j/y",time($date_string));
for some reason, when i'd do
$date = date("m-d-Y h:i A",$date_string);
it would display some bad data and i'm not sure why.
I'm just showing you another, possible, option.