Are you having the data as a String in your model? In the post link that was provided, you can see that it is recommended to hold the values as 'Date' objects in the model. When that is done, rendering is automatically done by displaying the date in the short format. If you still need your own renderer, you can do that with table.setDefaultRenderer which takes a 'class' type as the first argument.
You can checkout this tutorial page to know more about this.