public function init()
    {
        parent::init();

        $this->datetimeFormat = (empty(Yii::$app->params['site']->datetimeFormat)) ? $this->datetimeFormat : Yii::$app->params['site']->datetimeFormat;
        $this->timezone = (empty(Yii::$app->params['site']->timezone)) ? $this->timezone : Yii::$app->params['site']->timezone;
    }