Function to add 'toYMD()' method to a Date object to get the format 'yyyy-mm-dd' (Mysql date format)

toymd.js

// http://stackoverflow.com/a/2280117/918072
// Function to add 'toYMD()' method to a Date object to get the format 'yyyy-mm-dd' 
(function() {
    Date.prototype.toYMD = Date_toYMD;
    function Date_toYMD() {
        var year, month, day;
        year = String(this.getFullYear());
        month = String(this.getMonth() + 1);
        if (month.length == 1) {
            month = "0" + month;
        }
        day = String(this.getDate());
        if (day.length == 1) {
            day = "0" + day;
        }
        return year + "-" + month + "-" + day;
    }
})();

// var dt = new Date();
// var str = dt.toYMD();