Stop date from being selected after postback

Stop date from being selected after postback

I have a page which allows you to select a date from Multi date picker (http://dubrox.github.io/Multiple-Dates-Picker-for-jQuery-UI) and add the selected date to another control. Heres some of the code
  1.         $(document).ready(function () {
                Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);
                function EndRequestHandler(sender, args) {
                    $('#mdp-demo').multiDatesPicker({
                        dateFormat: "y-m-d"
                    });
                    $("#body_Button").click(function () {
                        var dates = $('#mdp-demo').multiDatesPicker('getDates');
                        $('#mdp-demo').multiDatesPicker('resetDates', 'disabled');
                    })
                }
            });

The problem i have is after postback (once the user has selected a date, clicked the button to add to another control) today's date is automatically selected.
i added this line
  1. $('#mdp-demo').multiDatesPicker('resetDates', 'disabled');
but made no difference.

How could i stop todays date being selected after postback?