Format JavaScript Date to yyyy-mm-dd

DateFormat.js

function formatDate(date){
    var d = new Date(date);
    var month = '' + (d.getMonth() + 1);
    var day = '' + d.getDate();
    var year = d.getFullYear();

    if (month.length < 2)
        month = '0' + month;
    if (day.length < 2)
        day = '0' + day;
    return [year, month, day].join('-');
}