How to change date format in JavaScript [duplicate]

Possible Duplicate:
Formatting a date in javascript

I have this:

HTML

Start Date:  <input type="date" id="startDate" name="startDate" ></p>

JavaScript

var  mydate = new Date(form.startDate.value);

After that mydate becomes

"05/05/2010"

Now, I want to change this format to

May 2010

Is there a way of doing it in JavaScript?

You can certainly format the date yourself..

var mydate = new Date(form.startDate.value);
var month = ["January", "February", "March", "April", "May", "June",
"July", "August", "September", "October", "November", "December"][mydate.getMonth()];
var str = month + ' ' + mydate.getFullYear();

You can also use an external library, such as DateJS.

Here's a DateJS example:

<script src="http://www.datejs.com/build/date.js" type="text/javascript"></script>
<script>
   var mydate = new Date(form.startDate.value);
   var str = mydate.toString("MMMM yyyy");
   window.alert(str);
</script>

Using the Datejs library, this can be as easy as:

Date.parse("05/05/2010").toString("MMMM yyyy");
//          parse date             convert to
//                                 string with
//                                 custom format

var month = mydate.getMonth(); // month (in integer 0-11)
var year = mydate.getFullYear(); // year

Then all you would need to have is an array of months:

var months = ['Jan', 'Feb', 'Mar', ...];

And then to show it:

alert(months[month] + "  " + year);