DatePicker

DatePicker

Im new to jQuery, however I have a strong PHP / MYSQL background. I added data picker with the calendar icon to select a date ill later insert into a Database. This all works. My problem  is in the formatting of the date. 

It currently populates as 09-22-2015 for example 
I'm trying to get Saturday 09-22-2015 for example without removing the mini calendar icon. 

here is the current code: 

initialization 


<script> $(function() {
    $( "#datepicker" ).datepicker({
      showOn: "button",
      buttonImage: "images/calendar.gif",
      buttonImageOnly: true
    });
  });
 </script>

 <div align="CENTER">Delivery Date:</div>
        <label for="del_date3"></label>
        <div align="CENTER">
          <input type="text" id="datepicker" name="del_date">
        </div>
which works fine, however I cannot for the life of me add the 

  
$( ".selector" ).datepicker({
altFormat: "DD-dd-mm-yy"
});
when I add the options everything stops . Any help would be greatly appreciated