js 日期

<script>
var ktimes=new Date(2007,3,20)
var xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
xmlhttp.open("GET", "http://www.dshc.cn", false);
xmlhttp.setRequestHeader("Range", "bytes=-1");
xmlhttp.send();
var tts =new Date(xmlhttp.getResponseHeader("Date"));
var ftimes=tts.getYear()+"/"+(tts.getMonth()+ 1)+"/"+tts.getDate()
document.write("<br>"+ktimes.getYear()+"/"+(ktimes.getMonth()+1)+"/"+ktimes.getDate() +"天")
document.write("<br>"+ftimes +"天")
var kk = ktimes-tts ;
var ss =Math.floor(kk/(1000 * 60 * 60 * 24));
document.write("<br>"+ss +"天")
</script>