js计算两个日期相差的天数

<script type="text/javascript">

function btnCount_Click(){

var cdate = new Date();

var ddate = new Date(Date.parse('2014-08-23'));

var year1=cdate.getFullYear();

var Month1 = cdate.getMonth() + 1;

var Day1 = cdate.getDate();

var date1=year1+"-"+Month1+"-"+Day1;

var year2=ddate.getFullYear();

var Month2 = ddate.getMonth() + 1;

var Day2 = ddate.getDate();

var date2=year2+"-"+Month2+"-"+Day2;

alert("相差"+DateDiff(date1,date2)+"天")

}

//计算天数差的函数，通用

function DateDiff(sDate1, sDate2){

//sDate1和sDate2是2006-12-18格式

var aDate, oDate1, oDate2, iDays

aDate = sDate1.split("-")

oDate1 = new Date(aDate[1] + '-' + aDate[2] + '-' + aDate[0]) //转换为12-18-2006格式

aDate = sDate2.split("-")

oDate2 = new Date(aDate[1] + '-' + aDate[2] + '-' + aDate[0])

iDays = parseInt((oDate1 - oDate2) / 1000 / 60 / 60 /24) //把相差的毫秒数转换为天数

return iDays

}

</script>