Knockout Datepicker update not triggerred

In a project which uses knockout datepicker binding mentioned at
http://stackoverflow.com/questions/6612705/jquery-ui-datepicker-change-event-not-caught-by-knockoutjs the datepicker update event was not triggered and hence observable value was not being updated.

I found a solution by changing "changeDate" event to simply "change".

so finally the binding handler looks like

ko.bindingHandlers.datepicker = {
    init: function(element, valueAccessor, allBindingsAccessor) {
        //initialize datepicker with some optional options
        var options = allBindingsAccessor().datepickerOptions || {},
            $el = $(element);

        $el.datepicker(options);

        //handle the field changing by registering datepicker's changeDate event
        ko.utils.registerEventHandler(element, "change", function () {
            var observable = valueAccessor();
            observable($el.datepicker("getDate"));
        });

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

    },
    update: function(element, valueAccessor) {
        var value = ko.utils.unwrapObservable(valueAccessor()),
            $el = $(element);

        //handle date data coming via json from Microsoft
        if (String(value).indexOf('/Date(') == 0) {
            value = new Date(parseInt(value.replace(/\/Date\((.*?)\)\//gi, "$1")));
        }

        var current = $el.datepicker("getDate");

        if (value - current !== 0) {
            $el.datepicker("setDate", value);
        }
    }
};

and html looks like

<input data-bind="datepicker: myDate, datepickerOptions: { minDate: new Date() }" />