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分享<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>日期差计算器</title>
</head>
<body>
<script>
var hzWeek= new Array("日","一","二","三","四","五","六","日");function cweekday(wday){return hzWeek[wday];}
function cala()
{
y=document.getElementById("SY").value;
m=document.getElementById("SM").value;
d=document.getElementById("SD").value;
ddd=document.getElementById("decday").value;
ttt=new Date(y,m-1,d).getTime()+ddd*24000*3600;
theday=new Date();
theday.setTime(ttt);
document.getElementById("result1").innerHTML=theday.getFullYear()+"年"+(1+theday.getMonth())+"月"+theday.getDate()+"日"+"星期"+cweekday(theday.getDay());
}
function calb()
{
y2=document.getElementById("SY2").value;
m2=document.getElementById("SM2").value;
d2=document.getElementById("SD2").value;
y3=document.getElementById("SY3").value;
m3=document.getElementById("SM3").value;
d3=document.getElementById("SD3").value;
day2=new Date(y2,m2-1,d2);
day3=new Date(y3,m3-1,d3);
document.getElementById("result2").innerHTML=(day3-day2)/86400000+"天";
}
</script>
<b>根据相差天数计算日期:</b>
<br>
距离:
<input size=8 id=SY value=2015>年
<input size=4 id=SM value=11>月
<input size=4 id=SD value=8>日
<b style="color:red;">(缺省为今天)</b>
<br>相差:
<input size=8 id=decday value=100>天
<b style="color:red;">(输入负数则往前计算)</b>
<br />日期是:
<b><span id=result1> </span></b>
<br>
<input type=button value="计算" onclick="cala()">
<br><br><br>
<b>根据日期计算相差天数:</b>
<br>
开始日期:
<input size=8 id=SY2 value=2015>年
<input size=4 id=SM2 value=11>月
<input size=4 id=SD2 value=8>日
<br>结束日期:
<input size=8 id=SY3 value=2016 >年
<input size=4 id=SM3 value=1>月
<input size=4 id=SD3 value=1>日
<br />相差天数:
<b><span id=result2> </span></b>
<br>
<input type=button value="计算" onclick="calb()">
<br>
<br>
</bodY>
</html>

protected void Page_Load(object sender, EventArgs e)
{
DateTime datetime1 = DateTime.Parse(this.TextBox1.Text);
DateTime datetime2 = DateTime.Parse(this.TextBox2.Text);
TimeSpan timespan = datetime2 - datetime1;
this.TextBox3.Text = timespan.ToString();
}