Date.prototype.format =function(format)
{
    var o = {
            "M+" : this.getMonth()+1, //month
            "d+" : this.getDate(), //day
            "h+" : this.getHours(), //hour
            "m+" : this.getMinutes(), //minute
            "s+" : this.getSeconds(), //second
            "q+" : Math.floor((this.getMonth()+3)/3), //quarter
            "S" : this.getMilliseconds() //millisecond
    };
    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;
};