public function actionGetMessageByDate()
 {
     $criteria = new EMongoCriteria();
     // find the single user with the personal_number == 12345
     $criteria->from('==', $_POST["message_date"]);
     $message_date = Message::model()->findAll($criteria);
     $this->render('GetMessageByDate', array('message_date' => CJSON::encode($message_date)));
 }