JSFiddle - React, Tailwind, and code Playground

HTML

<h3>Please enter the project Notice to Proceed (NTP) date: <input     id="NtpDate" type= "date" name="NtpDate"></h3>

<h3>Please enter the Report date: <input type= "date" name="ReportDate" id="abc"></h3>
<div id="show">

</div>

JavaScript

$("#abc").on("change", function () {
  var olddate = new Date($("#NtpDate").val());
  var newdate = new Date($(this).val());
  var timeDiff = Math.abs(newdate.getTime() - olddate.getTime());
  var diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24));
  $("#show").text('Difference in days = ' + diffDays + ' Days');
});