public static function clearSessions()
 {
     try {
         $sql = 'DELETE FROM ' . recordarMeTableClass::getNameTable() . ' WHERE localtimestamp(0) > (' . recordarMeTableClass::CREATED_AT . ' + INTERVAL :timeSeconds)';
         $params = array(':timeSeconds' => config::getCookieTime() . ' seconds');
         $answer = model::getInstance()->prepare($sql);
         $answer->execute($params);
         return true;
     } catch (PDOException $exc) {
         throw $exc;
     }
 }