Calculate days difference between two Dates 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("09/23/2019");
        var d2 = new Date("09/28/2019");
        var time = d2.getTime() - d1.getTime();
        var days = time / (1000 * 3600 * 24);
        $("#lblDays").html("Number of Days between <br/>" + d1 + " <br/>" + d2 + "<br/><b>" + days);
        $("#hfDays").val(days);
    });
</script>
<div>
    <span id="lblDays"></span>
    <input type="hidden" name="p1" value="1" id="hfDays" />
</div>