knocjout js date issue

<script type="text/javascript">
    var EmpViewModel = function () {
        //Make the self as 'this' reference
        var self = this;       
         self.startdate = ko.observable(new Date()),         
         self.enddate = ko.observable(''),     

        


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

                //handle the field changing
                ko.utils.registerEventHandler(element, "change", function () {
                    var observable = valueAccessor();
                    var elementValue = $(element).datepicker("getDate");
                    if (ko.isWriteableObservable(observable))
                        observable(elementValue);
                });

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

            },
            //update the control when the view model changes
            update: function (element, valueAccessor) {
                var value = ko.utils.unwrapObservable(valueAccessor());
                $(element).datepicker("setDate", value);
            }
        };

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

                //handle the field changing
                ko.utils.registerEventHandler(element, "change", function () {
                    var observable = valueAccessor();
                    var elementValue = $(element).datepicker("getDate");
                    if (ko.isWriteableObservable(observable))
                        observable(elementValue);
                });

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

            },
            //update the control when the view model changes
            update: function (element, valueAccessor) {
                var value = ko.utils.unwrapObservable(valueAccessor());
                $(element).datepicker("setDate", value);
            }
        };
</script>

in json resule we have receive date formats like /Date(605125800000)/ and we convert this date using knockout custom binding with date picker and we bind date to my grid but whenever we change my date then it will only affect my first record. suppose we have 3 record in grid.

1
2

3

in third row we change date then it will affect first row and third row remaining as it is. please solve my problem.

if any other way please tell me.