Knockout bindingHandlers para Date

gistfile1.js

ko.bindingHandlers.date = {
    update: function(element, valueAccessor) {
        ko.bindingHandlers.value.update.apply(this, arguments);

        var value = ko.utils.unwrapObservable(valueAccessor());
        var prop = $(element).is('input') ? 'value' : 'innerText';

        if (Date.isDate(value))
            element[prop] = $.datepicker.formatDate("dd/mm/yy", value);
    }
};