JQuery UI - Set minTime on timepicker based on other timepicker value

Question

I'm trying to set the minTime of my End Time timepicker based on what I've selected in the Start Time timepicker.

I have this, based on something that works for the regular datepicker, but it's not working.

$('#confirmed_time_start').timepicker({
    timeFormat: 'hh:mm',
    stepHour: 1,
    stepMinute: 15,
    hour: 8,
    minute: 0,
    hourMin: 8,
    hourMax: 18,
    onSelect: function(timeStr) {

        var newTime = $(this).timepicker('getDate');
        if (newTime) { // Not null
        newTime.setDate(newTime.getDate());
        }
        $('#confirmed_time_end').timepicker('minTime', newTime)
        }

    });

$('#confirmed_time_end').timepicker({
    timeFormat: 'hh:mm',
    stepHour: 1,
    stepMinute: 15,
    hour: 8,
    minute: 0,
    hourMin: 8,
    hourMax: 18 
    });

The error I'm receiving is:

Object doesn't support this property or method

Solution 1

var time = new Date();
$('#from').timepicker({
    ampm: true,
    hourMin: 9,
    hourMax: 19,
    timeFormat: 'hh:mm TT',
    onClose: function(dateText, inst) {
        var startDateTextBox = $('#to');
        if (startDateTextBox.val() != '') {
            var testStartDate = new Date(startDateTextBox.val());
            var testEndDate = new Date(dateText);
            if (testStartDate > testEndDate)
                startDateTextBox.val(dateText);
        }
        else {
            startDateTextBox.val(dateText);
        }
    },
    onSelect: function(dateText){
        var time = new Date($(this).datetimepicker('getDate').getTime());
        $('#to').timepicker('option', 'minDateTime',time);
    }
});
$('#to').timepicker({
    ampm: true,
    hourMin: 10,
    hourMax: 21,
    timeFormat: 'hh:mm TT',
    onClose: function(dateText, inst) {
        var startDateTextBox = $('#from');
        if (startDateTextBox.val() != '') {
            var testStartDate = new Date(startDateTextBox.val());
            var testEndDate = new Date(dateText);
            if (testStartDate > testEndDate)
                startDateTextBox.val(dateText);
        }
        else {
            startDateTextBox.val(dateText);
        }
    },
    onSelect: function(dateText){
        var time = new Date($(this).datetimepicker('getDate').getTime());
        $('#from').timepicker('option', 'maxDateTime',time);
    }
});

Solution 2

$('#confirmed_time_start').timepicker({
timeFormat: 'hh:mm',
stepHour: 1,
stepMinute: 15,
hour: 8,
minute: 0,
hourMin: 8,
hourMax: 18,
onSelect: function(timeStr) {

    var newTime = $(this).timepicker('getDate');
    if (newTime) { // Not null
    newTime.setDate(newTime.getDate());
    }
   $('#confirmed_time_end').timepicker('setTime', newTime);
    }

});