[chybber]

Originally Posted by DND

$dst_in_use = localtime(time() + ((int)$time_offset * 3600) , true);

But show me your entire timezone block

if(isset($_POST["user_timezone"]) && preg_match('#^\-?\d{1,2}(?:\.\d{1,2})?$#', $_POST['user_timezone'])){
    $time_offset = sqlesc($_POST['user_timezone']);
    }else{
    $time_offset = isset($TBDEV['time_offset']) ? sqlesc($TBDEV['time_offset']) : '0';
}
    $dst_in_use = localtime(time() + ($time_offset * 3600),

that?