JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-datetimepicker/2.5.4/build/jquery.datetimepicker.full.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/jquery-datetimepicker/2.5.4/build/jquery.datetimepicker.min.css">
	<h3>Deadline:</h3>
	<input type="text" id="datetimepicker"/>

JavaScript

$('#datetimepicker').datetimepicker({
	timepicker:false,
	format:'d/m/Y',
	formatDate:'Y/m/d',
	minDate:'+1970/01/00',
  onSelectDate:function( ct ){
  
  var dateFrom = "06/08/2017";
  var dateTo = "06/11/2017";
  var dateCheck = "06/09/2017";

  var d1 = dateFrom.split("/");
  var d2 = dateTo.split("/");
  var c = dateCheck.split("/");

  var from = new Date(d1[2], parseInt(d1[1])-1, d1[0]);  // -1 because months are from 0 to 11
  var to   = new Date(d2[2], parseInt(d2[1])-1, d2[0]);
  var check = new Date(c[2], parseInt(c[1])-1, c[0]);

    alert(check > from && check < to);
  },
});