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

        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);

        }

    }

};

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