Ok
In my controller 
/**
     * @return \Phalcon\Http\ResponseInterface
     */
    public function saveAction()
    {
        //  Is not $_POST
        if (!$this->request->isPost()) {
            $this->view->disable();
            return $this->response->redirect($this->router->getControllerName());
        }
        $id = $this->request->getPost('id', 'int', null);
        $date = date('Y-m-d H:i:s');
        if (!empty($id)) {
            $object = User::findFirstById($id);
        } else {
            $object = new User;
            $registerHash = md5(uniqid(rand(), true));
            $randomPasswd = substr(md5(microtime()), 0, 7);
            $object->setIdRole(2); //Role::ROLE_ADMINISTRATOR
            $object->setPasswd($this->security->hash($randomPasswd));
            $object->setRegisterhash($registerHash);
            $object->setDateAdd($date);
            $object->setStatus(User::STATUS_PENDING);
        }
        $object->setGender($this->request->getPost('gender'));
        $object->setDateUpd($date);
        $form = new UserForm($object);
        $form->bind($_POST, $object);
        //  Form isn't valid
        if (!$form->isValid($this->request->getPost())) {
            foreach ($form->getMessages() as $message) {
                $this->flashSession->error($message->getMessage());
            }
            // Redirect to edit form if we have an ID in page, otherwise redirect to add a new item page
            return $this->response->redirect(
                $this->router->getControllerName() . (!is_null($id) ? '/edit/' . $id : '/new')
            );
        } else {
            if (!$object->save()) {
                foreach ($object->getMessages() as $message) {
                    $this->flashSession->error($message->getMessage());
                }
                return $this->dispatcher->forward(
                    ['controller' => $this->router->getControllerName(), 'action' => 'new']
                );
            } else {
                $this->flashSession->success(t('Data was successfully saved'));
                return $this->response->redirect($this->router->getControllerName());
            }
        }
    }
Are you sure format date in Mysql $date = date('Y-m-d H:i:s');