formatDate.js

// formats Date object in format "yyyy-mm-dd"
function format_date(date) {
    var day = date.getDate().toString();
    var month = (date.getMonth() + 1).toString();
    var year = date.getFullYear().toString();
    if (day.length === 1) day = "0" + day;
    if (month.length === 1) month = "0" + month;
    return [day, month, year].join('-');
}