Making bootstrap datetimepicker to select only time got Invalid date format error

Hello, In laravel 6, Bootstrap / Jquery app I want to make bootstrap-datetimepicker with time only selection as in this https://eonasdan.github.io/bootstrap-datetimepicker/#time-only example

and with blade code :

                <div class="form-group row">
                    <label class="col-form-label col-md-6">Time<small>(utc) </small></label>
                    <div class="col-md-6">
                        <div class="input-group date" id="time_utc">
                            <input type="text" class="form-control"/>
                            <span class="input-group-addon">
                                <span class="glyphicon glyphicon-time"></span>
                            </span>
                        </div>
                    </div>
                </div>

I open modal with several fields and datetimepicker, which I want to show only as time picker (as in link above):

  $('#add_noon_report').on('click', function () {
    $('#add_noon_report_lat').val('')
    $('#add_noon_report_lng').val('')
    $('#add_noon_report_lat_degrees').val('')
    ...
    $('#datereported_utc').val('')
    $('#time_utc').val('6:20')  // I TRIED DIFFERENT FORMAT OF DEFAULT VALUE - BUT EMPTY PREDERABLE
    // $('#time_utc').val('6:20 PM')
    // $('#time_utc').val(null)



    $('#add-noon-report-modal').modal('toggle')
    $('#datereported_utc').datetimepicker({
      todayHighlight: true,
      autoclose: true,
      format: 'yyyy-mm-dd hh:ii'
    }).on('change', function () {
    })

    $('#time_utc').datetimepicker({
      format: 'LT'
    });

  }); // $('#add_noon_report').on('click', function () {

But I got error in console :

app.js:10140 Uncaught Error: Invalid date format.
    at Object.parseFormat (app.js:10140)
    at new Datetimepicker (app.js:8655)
    at HTMLDivElement.<anonymous> (app.js:10043)
    at Function.each (app.js:69700)
    at jQuery.fn.init.each (app.js:69535)
    at jQuery.fn.init.$.fn.datetimepicker (app.js:10038)
    at HTMLButtonElement.<anonymous> (trip-details.js:1078)
    at HTMLButtonElement.dispatch (app.js:74570)
    at HTMLButtonElement.elemData.handle (app.js:74377)

In package.json I have :

        "jquery": "^3.3.1",
        "jquery-form": "^4.2.2",
        "jquery-ui": "^1.12.1",
        "jquery-validation": "1.19.0",


        "bootstrap": "^4.4.1",
        "bootstrap-datepicker": "^1.8.0",
        "bootstrap-daterangepicker": "^3.0.3",
        "bootstrap-datetime-picker": "^2.4.4",
        "bootstrap-datetimepicker": "^0.0.7",

Any ideas how to fix this error ?