$actionLog = new CRM_Core_DAO_ActionLog();
$params['action_date_time'] = CRM_Utils_Array::value('action_date_time', $params, date('YmdHis'));
$actionLog = new CRM_Core_DAO_ActionLog();
$params['action_date_time'] = CRM_Utils_Array::value('action_date_time', $params, date('YmdHis'));