General Support: Sorting collections

How do I go about sorting the collections on date submitted? I have looked in the code of gallery.php and plog-functions.php and changed the sort order to 'id' DESC. But that didn't take any effect.
I have tried to restart my browser without any result.

I did however manage to change the album sort order in gallery.php:

$sql = "SELECT * FROM `".$TABLE_PREFIX."albums` WHERE `parent_id` = '$id' AND id IN ($imlist) ORDER BY `id` DESC LIMIT ".$from.",".$config["thumb_num"];