public static function updateclass($cls_id, $classdate, $classtime, $spots, $note)
{
global $database;
$cls_id = $database->escape_value($cls_id);
$classdate = $database->escape_value($classdate);
$classtime = $database->escape_value($classtime);
$spots = $database->escape_value($spots);
$note = $database->escape_value($note);
$timestmp = DateManager::convertdateandtime2tmstp($classdate, $classtime);
$insert_query = "UPDATE classes SET `date` = '" . $timestmp . "', `spots` = '" . $spots . "', `note` = '" . $note . "' WHERE `classes`.`id` ='" . $cls_id . "'";
return $database->query($insert_query);
}
