gentelella/vendors/bootstrap-datetimepicker/test/screen-capture/t3.html

<div class='input-group date' data-datetimepicker>
                    <input type='text' class="form-control" />
                    <span class="input-group-addon">
                        <span class="glyphicon glyphicon-calendar" data-click-target></span>
                    </span>
                </div>