Date.prototype.format = function (format) {

    var o = {

        "M+": this.getMonth() + 1,

        "d+": this.getDate(),

        "h+": this.getHours(),

        "m+": this.getMinutes(),

        "s+": this.getSeconds(),

        "q+": Math.floor((this.getMonth() + 3) / 3),

        "S": this.getMilliseconds()

    };

    if (/(y+)/.test(format)) {

        format = format.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));

    }

    for (var k in o) {

        if (new RegExp("(" + k + ")").test(format)) {

            format = format.replace(RegExp.$1, RegExp.$1.length == 1 ? o[k] : ("00" + o[k]).substr(("" + o[k]).length));

        }

    }

    return format;

};