public function actionSignup()
    {
        $model = new User();

    // collect user input data
    if(isset($_POST['User']))
    {
        $model->attributes=$_POST['User'];

        // validate user input and redirect to the previous page if valid
        $model->setAttributes(array(
            'datereg' => time(), //additional data you want to insert
            'lastlogin' => time() //additional

        ));

        if($model->save())
        {
                           //optional
            $login=new LoginForm;
            $login->username = $_POST['User']['username'];
            $login->password = $_POST['User']['password'];
            if($login->validate() && $login->login())
                $this->redirect('/telephone/add');
        }

    }
    else
 {
        return $this->render('register');
 }
    }

<div class="container">
<div class="row">
<h2> New User Signup</h2><br>
    <form class="formclass" method="POST" action="<?php echo Yii::$app->request->baseUrl;?>/telephone/signup/" role="form"  id="register-form" novalidate="novalidate">
                      <label> UserName:</label>     <input type="name" name="username" id="username" placeholder="UserName" required><br><br>
                      <label>    Password: </label>       <input type="password" name="password" id="password" placeholder="Password" required><br><br>
           <button type="submit" class="btn btn-default">Sign Up</button><BR><BR>
                            </form>

</div>
</div>