JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-2.2.3.min.js"></script>
  <input type="date" name="bday" id="bday">

JavaScript

$(document).ready(function()  {
   $("#bday").blur(function()  {
     result=$("#bday").val();
     result=result.substr(5,2)+"-"+result.substr(8, 2)+"-"+result.substr(0, 4);
     alert(result);
   });
 });