JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://www.eyecon.ro/datepicker/js/datepicker.js"></script>
<link rel="stylesheet" href="http://www.eyecon.ro/datepicker/css/datepicker.css">
<div class="Fecha2"></div> <!-- esto SI funca -->

<input type="text" id="date3" class="Fecha" > <!-- esto NO funca -->

JavaScript

$(document).ready(function() {
$('.Fecha').DatePicker({
    date: ['2008-07-28','2008-07-31'],
    current: '2008-07-31',
    mode: 'range',
    calendars: 3,
    starts: 1
});
});