How do I format date from Ajax Calendar Extender as Day dd/mm/yyyy

I want to add Day name to the date provided by the AJAX calendar extender.  An output example would be Wednesday 2/20/2013.  Although a shortened day example is certainly acceptable like Wed 2/20/2013.  Ideally there is a simple format string to add to the control's html.  However, code behind (JavaScript or VB) could work too.  I've searched the forums and found a number of suggestions for formatting the calendar extender, but nothing that adds the day name to its output without a time component.  Am I attempting the impossible?  Thank you for any ideas or suggestions you wish to provide, they are greatly appreciated...................Phil Hoop