My97DaePicker 用js实现文本框日期相减求天数

 <tr>
                <td align="center" style="background-color: #cccccc;font-size:16px;">
                    开始时间：</td>
                <td style="padding-left: 5px; background-color: #ffffff">
                    <asp:TextBox ID="txtStartDate" runat= "server"  Width="20%" Font-Size="16px" onclick="WdatePicker({el:'txtStartDate',dateFmt:'yyyy-MM-dd'})"></asp:TextBox>
                    <img align="absmiddle" height="22"  onclick="WdatePicker({el:'txtStartDate',dateFmt:'yyyy-MM-dd'})" src="../My97DatePicker/skin/datePicker.gif" width="16" />
                    <asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server"
                        ControlToValidate="txtStartDate" ErrorMessage="*不能为空"></asp:RequiredFieldValidator>
              </td>
                     
            </tr>
            <tr>
                <td align="center" style="height: 25px; background-color: #cccccc;font-size:16px;">
                    结束时间：</td>
                <td style="padding-left: 5px; background-color: #ffffff">
                    <asp:TextBox ID="txtEndDate" runat="server"  Width="20%" Font-Size="16px"
                        onclick="WdatePicker({el:'txtEndDate',dateFmt:'yyyy-MM-dd',onpicked:PickedFunc2})"></asp:TextBox>
                    &nbsp;<img align="absmiddle" height="22" onclick="WdatePicker({el:'txtEndDate',dateFmt:'yyyy-MM-dd',onpicked:PickedFunc2})"src="../My97DatePicker/skin/datePicker.gif" width="16" />
                    <asp:RequiredFieldValidator ID="RequiredFieldValidator5" runat="server"
                        ControlToValidate="txtEndDate" ErrorMessage="*不能为空"></asp:RequiredFieldValidator>
                </td>
            </tr>

第一种：jquery

<script  type="text/javascript">
        
            function PickedFunc2(){
            $dp.$('txtEndDate').value=$dp.cal.getP('y')+"-"+$dp.cal.getP('M')+"-"+$dp.cal.getP('d');
             if($("input[id$='txStartDate']").val()!= ""&&$("input[id$='txtEndDate']").val() != "")
                {
                    var arrDate,objDate1,objDate2,intDays;
                    arrDate=$("input[id$='txtStartDate']").val().split("-");
                    objDate1=new Date(arrDate[1]+'-'+arrDate[2]+'-'+arrDate[0]);
                    arrDate=$("input[id$='txtEndDate']").val().split("-");
                    objDate2=new Date(arrDate[1] + '-'+arrDate[2]+'-'+arrDate[0]);
                     $("input[id$='txtTotalDays']").val(parseInt(Math.abs(objDate2-objDate1)/1000/60/60/24));
                }
                               }        
</script>

第二种：

<script type="text/javascript">   
    var getOffDays = function(startDate, endDate) {    
    var mmSec = (endDate.getTime() - startDate.getTime()); //得到时间戳相减得到以毫秒为单位的差    
      return (mmSec / 3600000 / 24); //单位转换为天并返回    
    };    
    alert(getOffDays(new Date(2010,10,24), new Date(2010,12,3)));    

第三种：

<script type="text/javascript">

function DateDiff(sDate1,sDate2)
{ 
    var arrDate,objDate1,objDate2,intDays;
    arrDate=sDate1.split("-");
    objDate1=new Date(arrDate[1]+'-'+arrDate[2]+'-'+arrDate[0]);
    arrDate=sDate2.split("-");
    objDate2=new Date(arrDate[1] + '-'+arrDate[2]+'-'+arrDate[0]);
    intDays=parseInt(Math.abs(objDate1-objDate2)/1000/60/60/24);
    return intDays;
}
function check() 
{

     var beginday = document.getElementByIdx_x("Text1").value;
     var lastday = document.getElementByIdx_x("Text4").value;
     var DayNum = DateDiff(beginday,lastday);
      alert(DayNum);      
     //就可以判断出相差的天数,然后你再判断时间,如果结束时间的小时数,小于开始时间的小时数,那么天数就减一天,开始小时数加24,

}

    </script>