calculate date and display

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Javascript

I have a dropdown list that shows the number of months from 12 months upto 72 months.. when i select 12 months it should display the date calculating from current date to the specified date and year..


Suppose i select 12 months then label should display:
21 September 2012 To 21 September 2013 This is the required format of date too.

This is the code am doing now;

function SetDuration() {
        try {
            var month = document.getElementById("ddlContractDuration").value;
            var CurrentDate = new Date();
            var toDate = new Date();
            toDate.setMonth(Number(toDate.getMonth()) + Number(month));
            document.getElementById('txtDuration').value =toDate.toString('mm/dd/yyyy');
        }
        catch (ex) {
            alert(ex.Message());
        }
    }

but the calculation is correct but the format is not correct.