gentelella/vendors/bootstrap-datetimepicker/test/screen-capture/t4.html

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