I try to select 2 month only ie. when i select date 1-06-2016 then to date must be 31-07-2016 means what ever user select date two months time period will be display how i do this

in this code currently only 1 month is display ie. if i select from date 1-06-2016 then to date shows 30-06-2016 but i want to select 2 months

  <script type="text/javascript">

     $(function () {

         var currentYear = (new Date).getFullYear();
         var currentMonth = (new Date).getMonth();
         var currentDay = (new Date).getDate();
         $('#fromdate').datepicker({

             minDate: new Date((currentYear - 2), 12, 1),
             //minDate: 0,
             dateFormat: 'yy-mm-dd',
             maxDate: new Date(currentYear, currentMonth, currentDay),
             //maxDate: new Date((currentYear + 1), 12, 1),
             onSelect: function (selectedDate) {

                 // Start Date
                 var startDate = $(this).datepicker('getDate');
                 $('#todate').datepicker('option', 'minDate', startDate);
                 $('#todate').datepicker('setDate', startDate);

                 // End Date
                 var enddate = $(this).datepicker('getDate');
                 enddate.setDate(enddate.getDate() + 30);
                 $('#todate').datepicker('option', 'maxDate', enddate);
             }
         });

         $('#todate').datepicker({
             minDate: new Date((currentYear - 2), 12, 1),
             minDate: 0,
             dateFormat: 'yy-mm-dd',
             maxDate: '+30'
         });

     });
  </script>