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;
}

 var day="";
 var month="";
 var ampm="";
 var ampmhour="";
 var myweekday="";
 var year="";
 mydate=new Date();
 myweekday=mydate.getDay();
 mymonth=mydate.getMonth()+1;
 myday= mydate.getDate();
 myyear= mydate.getYear();
 year=(myyear > 200) ? myyear : 1900 + myyear;
 if(myweekday == 0)
 weekday=" 星期日";
 else if(myweekday == 1)
 weekday=" 星期一";
 else if(myweekday == 2)
 weekday=" 星期二";
 else if(myweekday == 3)
 weekday=" 星期三";
 else if(myweekday == 4)
 weekday=" 星期四";
 else if(myweekday == 5)
 weekday=" 星期五";
 else if(myweekday == 6)
 weekday=" 星期六";
year=mydate.format('yyyy');
document.write(year+"年"+mymonth+"月"+myday+"日"+weekday);