Huh, now I've got an idea...
Open /inc/class.users.php and go to the function Add.
There you'll have to replace this line:
PHP Code:
dbquery("INSERT INTO users (username,password,mail,auth_ticket,rank,look,gender,motto,credits,activity_points,last_online,account_created) VALUES ('" . $username . "','" . $passwordHash . "','" . $email . "','','" . $rank . "','" . $figure . "','" . $sex . "','','500','1000','','" . date('d-M-Y') . "')");
with
PHP Code:
dbquery("INSERT INTO users (username,password,mail,auth_ticket,rank,look,gender,motto,credits,activity_points,last_online,account_created) VALUES ('" . $username . "','" . $passwordHash . "','" . $email . "','','" . $rank . "','" . $figure . "','" . $sex . "','','500','1000',".time().",'" . date('d-M-Y') . "')");
EDIT:
Please do NOT forget to make a BACKUP