JSFiddle - React, Tailwind, and code Playground

HTML

Date1: <input type="date" id="date1" value="2013-01-08"> 
<br>
Date2:<input type="date" id="date2" value="2013-01-09">
    

    
<button> GEt Difference</button>

JavaScript

$("button").click(function(){
        var date1 = parseInt( $('#date1').val());
    alert(date1);
        var date2 = parseInt($('#date2').val());
        var diff = Math.round((date1 - date2 ) / 1000 / 60 / 60 / 24);
     alert(diff);
        return diff;


})