Maybe you should change the timeformat of the timestamp which is displayed after adding a ban (I mean the summary).
Actually it shows the Unix timestamp
date('m/d/y',
$timestamp); // would do it
And btw.: When you edit this file, could you add a stripslashes() and a nl2br() to the "other Information"?
(maybe there is a missing htmlspecialchars() or htmlentities() too, I haven't tested this, just a hint
)