I am getting the date instead of date and time data in a POST request

I have a date range picker on my website.

When a user inputs the date and time range, I want to send separately within the form the startDate and the endDate

daterangepicker code:

    $('input[name="datetimes"]').daterangepicker({
        timePicker: true,
        timePickerIncrement: 5,
        startDate: moment().startOf('hour'),
        endDate: moment().startOf('hour').add(32, 'hour'),
        locale: {
          format: 'YYYY-MM-DD hh:mm'
        },
        opens: 'center',
        drops: 'auto'
    });

And this is what I tried:

$('#formid').submit(function(e) {
    e.preventDefault();
    let startDate = ($('#datetimes').data('daterangepicker').startDate).format('YYYY-MM-DD hh:mm');
    let endDate = ($('#datetimes').data('daterangepicker').endDate).format('YYYY-MM-DD hh:mm');
    $(this).append('<input type="hidden" name="start_date" value='+startDate+' /> ');
    $(this).append('<input type="hidden" name="end_date" value='+endDate+' /> ');
    this.submit();
});

Before the this.submit(); I did a console.log(startDate) and thi is what I am getting:

I am getting the date and the time (as expected), but then if I try doing a print(request.POST) in the view (django back-end), this is what I get:

Somehow, during the POST the HH:mm disappeared.

How can I keep the values of hh:mm during the POST?