JSFiddle - React, Tailwind, and code Playground

HTML

<div id="selectedDate"></div>
<div id="datepicker">Hey</div>
<div class="selectedDate2"></div>

JavaScript

$(function() {
    $("#datepicker").datepicker({dateFormat: 'dd-mm-yy',
        onSelect: function(dateText, inst) {
              var d = $(this).datepicker("getDate");
              var s = parseInt(d/1000);
              $("#selectedDate").text("on " + dateText + "");
              $(".selectedDate2").text(s);
        }
    });
});