full calendar event description description

Today I am working with Full calendar, I made a small modal window so that when I clicked on an event, it showed me its different data, here is my JavaScript code for the calendar:

    $(document).ready(function () {

        $('#calendar').fullCalendar({
            header: {
                left: 'prev,next today',
                center: 'title',
                right: 'month,agendaWeek,agendaDay'
            },
            // defaultDate: '2017-09-12',
            navLinks: true, // can click day/week names to navigate views
            editable: true,
            eventLimit: true, // allow "more" link when too many events
            selectable: true,
            events: {
                url: 'data',
                error: function () {
                    console.log("error")
                }
            },


                eventClick: function (event, jsEvent, view) {
                //alert("nombre del evento" + event.start.format("YYYY-MM-DD HH:MM:SS") );
                //$('#myModalLabel').html(event.title);
                $('#ModalTitle').html(event.title);    
                $('#start').html(event.start.format("YYYY-DD-MM h\ hh:mm:ss") );
                $('#Modalevent').modal('show');
            },
        });

    });

With this I get the following calendar:

When I press an event I get the following:

Well, now my problem is that, I want to get the DATE within a input and not in a label , but when I place it and do exactly the same as with the label , it does not show me the date , show me this:

And I want to get it in an input, since I work with python and send that data through the request method to python, I attach an example of another modal window that I already made:

@app.route('/send', methods=['GET','POST'])
    def send():  
       if request.method == 'POST':


        bay= request.form['Bay']
        rack= request.form['Rack']
        status= request.form['Status']
        user= request.form['User']
        comment= request.form['Comment']
        hostname= request.form['Hostname']
        hostname = str(hostname)

but for this, I need to have the data in the input, does anyone know how I can make it appear in the input correctly? or because it does not appear to me. I attach the html code:

SAMPLE WITH LABEL:

<div class="modal fade" id="Modalevent">
    <div class="modal-dialog modal-sm" role="document">
        <div class="modal-content">
            <div class="modal-header bg-inverse">
                <h3 class="modal-title text-center" id="ModalTitle">
                </h3>
            </div>
            <div class="modal-body">
                <div class="form-group">
                    <h3 class="text-center"> DATE</h3>

                    **<h4 class="text-center" id="start"  name="date"> DATE: </h1>**
                        <br>
                        <h3 class="text-center"> CATEGORY</h3>
                        <select class="form-control" name="category">

                          <option>Work</option>
                          <option>Schedule_Downtime</option>              
                          <option>Non_Schedule_Downtime</option>           
                          <option>Overtime</option>                                            

                    </select>
                </div>
            </div>
            <div class="modal-footer ">
                <button type="button" class="btn btn-primary">Save changes</button>
                <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
            </div>
        </div>
    </div>
</div>

SAMPLE WITH INPUT:

<!-- Ventana modal -->
    <div class="modal fade" id="Modalevent">
        <div class="modal-dialog modal-sm" role="document">
            <div class="modal-content">
                <div class="modal-header bg-inverse">
                    <h3 class="modal-title text-center" id="ModalTitle">
                    </h3>
                </div>
                <div class="modal-body">
                    <div class="form-group">
                        <h3 class="text-center"> DATE</h3>
                        **<input class="form-control" name"start">**
                            <br>
                            <h3 class="text-center"> CATEGORY</h3>
                            <select class="form-control" name="category">

                              <option>Work</option>
                              <option>Schedule_Downtime</option>              
                              <option>Non_Schedule_Downtime</option>           
                              <option>Overtime</option>                                            

                        </select>
                    </div>
                </div>
                <div class="modal-footer ">
                    <button type="button" class="btn btn-primary">Save changes</button>
                    <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
                </div>
            </div>
        </div>
    </div>