Display Date of article in Yootheme Widgetkit 2 sliderset (wordpress Plugin)

The Problem i need to solve is to display the Date of an Article in YooThmes Widgetkit 2 slider to make it look like a news slider.

screenshot

I tried the Wordpress reference date data but it didn´t work.

<?php the_date('Y-m-d', '<h2>', '</h2>'); ?>

Maybe the solution is the same like in other Wordpress plugins but iam not very familiar with php or plugin development so i don´t really know.

via Chebli Mohamed