JSFiddle - React, Tailwind, and code Playground

by Superman

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.16/themes/base/jquery-ui.css">
<p>Choose your dates and hit <em>go</em>.</p>
<input type="text" id="arr_date">
<input type="text" id="dep_date">
<button>go</button>

JavaScript

$(function() {
    $( "#arr_date" ).datepicker({ dateFormat: 'dd-mm-yy' });
    $( "#dep_date" ).datepicker({ dateFormat: 'dd-mm-yy' });
});
$('button').click(function() {
    var start = $('#arr_date').datepicker('getDate');
    var end   = $('#dep_date').datepicker('getDate');
    var days   = (end - start)/1000/60/60/24;
    var weeks = days/7;
    alert(days);
    alert(weeks);
});