javascript date + 7 days

Question

What\'s wrong with this script?

When I set my clock to say 29/04/2011 it adds 36/4/2011 in the week input! but the correct date should be 6/

Answer 1

var days = 7;
var date = new Date();
var res = date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));

var d = new Date(res);
var month = d.getMonth() + 1;
var day = d.getDate();

var output = d.getFullYear() + '/' +
    (month < 10 ? '0' : '') + month + '/' +
    (day < 10 ? '0' : '') + day;

$('#txtEndDate').val(output);