<link href="//netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/css/bootstrap-combined.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/js/bootstrap.min.js"></script> <script src="//code.jquery.com/jquery-1.11.1.min.js"></script> <!------ Include the above in your HEAD tag ----------> <div class="container"> <div class="row"> <h2>Bootstrap v4 datepicker </h2> <br/> <br/> <div class="col-12"> <div class="form-group"> <label >Begin voorverkoop periode</label> <input type="date" name="bday" max="3000-12-31" min="1000-01-01" class="form-control"> </div> <div class="form-group"> <label >Einde voorverkoop periode</label> <input type="date" name="bday" min="1000-01-01" max="3000-12-31" class="form-control"> </div> </div> </div> </div> <script> window.alert("aaaaa") </script>