if (isset($_REQUEST['event_start_date']) && $_REQUEST['event_start_date'] != '') {
      if (DateTime::createFromFormat("Y-m-d", trim($_REQUEST['event_start_date']))) {
        $event_start_date = DateTime::createFromFormat("Y-m-d", trim($_REQUEST['event_start_date']))->getTimestamp();
      } else {
        $ok = false;