gistfile1.js

ko.bindingHandlers.date = {
    init: function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {

        var observable = valueAccessor();
        // alternately setup jquery-ui-date here
        element.addEventListener('change', function() {
           var date = new Date(element.value);
           observable(date.getTime());
        });
    },

    update: function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
        var timeStamp = ko.utils.unwrapObservable(valueAccessor());
        var date = new Date(timeStamp);
        element.value = [date.getMonth() + 1, date.getDate(), date.getFullYear()].join('/');
    }
};

<input type="text" data-bind="date: someDateObserbable " />