js 求两个日期相差的天数

转载 http://www.cnblogs.com/caoyuzhi/archive/2012/12/25/2831928.html  


<script type="text/javascript">

              function getDays(strDateStart, strDateEnd) {
                  var strSeparator = "-"; //日期分隔符
                  var oDate1;
                  var oDate2;
                  var iDays;
                  oDate1 = strDateStart.split(strSeparator);
                  oDate2 = strDateEnd.split(strSeparator);
                  var strDateS = new Date(oDate1[0], oDate1[1] - 1, oDate1[2]);
                  var strDateE = new Date(oDate2[0], oDate2[1] - 1, oDate2[2]);
                  iDays = parseInt(Math.abs(strDateS - strDateE) / 1000 / 60 / 60 / 24)//把相差的毫秒数转换为天数 
                  return iDays;
              }


              alert(getDays("2011-12-31", "2012-1-1"));

    </script>