private function getSupportedAttribute($event)
    {
        $model = $event->getModel();

        // Not a metamodel model.
        if (!$model instanceof Model) {
            return null;
        }

        $property  = $event->getProperty();
        $attribute = $model->getItem()->getAttribute($property);

        if ($attribute instanceof Timestamp) {
            return $attribute;
        }

        return null;
    }