The below method sends date to text box in this format Wed Sep 14 2016 00:00:00 GMT+0400.
So i tried to use substring method to get date in this format Sep 14 2016

i have tried to it in below code but it didn't work

it return this error Uncaught TypeError: date.substring is not a function

<script>

    $(document).ready(function () {

        var dateval = $('#<%= txtdate.ClientID %>').val();

        if (dateval != '') {



            var options = {

                selectedDate: dateval,

                size: 'medium',

                width: 960

            }

        } else {

            var options = {

                size: 'medium',

                width: 960

            }

        }

        $('#paginator').datepaginator(options);

        $('#paginator').on('selectedDateChanged', function (event, date) {

            $('#<%= txtdate.ClientID %>').val(date.substring(4, 12));

        });

    });

</script>