Calculate days difference between current and specified Date in JavaScript and jQuery

<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script type="text/javascript">
    $(function () {
        var d1 = new Date();
        var d2 = new Date("09/28/2019");
        var time = d2.getTime() - d1.getTime();
        var days = time / (1000 * 3600 * 24);
        if (parseInt(days) > parseInt(30)) {
           $("#hfTime").val("M");
        }else{
           $("#hfTime").val("D");
        }
        $("#lblDays").html("Number of Days between <br/>" + d1.toLocaleDateString() + " <br/>" + d2.toLocaleDateString() + "<br/><b>" + parseInt(days));
        $("#hfDays").val(parseInt(days));
    });
</script>
<div>
    <span id="lblDays"></span>
    <input type="hidden" name="p1" value="1" id="hfDays" />
    <input type="hidden" name="t1" value="D" id="hfTime" />
</div>