knockoutjs databind with jquery controls

http://stackoverflow.com/questions/6399078/knockoutjs-databind-with-jquery-controls

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.11/themes/base/jquery-ui.css">
<script src="http://knockoutjs.com/downloads/knockout-2.2.1.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/moment.js/2.4.0/moment.js"></script>

<input data-bind="datepicker: myDate" />
<input data-bind="timepicker: myDate" type="time" />
<hr />
<button data-bind="click: setToCurrentDate">Set To Current Date</button>
<button data-bind="click: showCurrentDateTime">Show current date</button>
<hr />
<div data-bind="text: myDate"></div>

CSS

td, th {
    padding: 5px;
    border: solid 1px black;
}
th {
    color: #666;
}
a {
    font-size: .75em;
}

JavaScript

ko.bindingHandlers.datepicker = {
    init: function (element, valueAccessor, allBindingsAccessor) {
   
        var $el = $(element);

        //initialize datepicker with some optional options
        var options = allBindingsAccessor().datepickerOptions || {};
        $el.datepicker(options);

        //handle the field changing
        ko.utils.registerEventHandler(element, "change", function () {
        	
            var observable = valueAccessor();
            var oldDate = observable();
          	var newDate = $el.datepicker("getDate");
            var newDate = new Date(newDate.toLocaleDateString() + " " + oldDate.toLocaleTimeString());
            
            observable(newDate);
        });

        //handle disposal (if KO removes by the template binding)
        ko.utils.domNodeDisposal.addDisposeCallback(element, function () {
            $el.datepicker("destroy");
        });

    },
    update: function (element, valueAccessor) {
    var d = viewModel.myDate();
    if (d!=null) alert(d);
        var value = ko.utils.unwrapObservable(valueAccessor()),
            $el = $(element),
            current = $el.datepicker("getDate");
				
        if (value - current !== 0) {
        	
            $el.datepicker("setDate", value);
        }
    }
};

ko.bindingHandlers.timepicker = {
    init: function (element, valueAccessor, allBindingsAccessor) {
        // Get the value of the value binding
        var value = valueAccessor();
        var thisElement = $(element);
        console.log('The value of the element should be here - ', value());
        // If the value is not a valid moment in time,
        console.log(!moment(value()).isValid());
        //handle the field changing
        ko.utils.registerEventHandler(element, "change", function () {
            var observable = valueAccessor();
            console.log('observable - ', observable());
        var tzdstOffset = (observable().getTimezoneOffset() + (moment(observable()).isDST() ? 60 :...