How to set start and End date to bootstrap datepicker?

<script>   
    /*** For the start date***/
    var FromStartDate = new Date();
    $('#datepicker').datepicker({
        startDate: FromStartDate,
        autoclose: true
    });

    /*** For the end date***/

    var FromEndDate = new Date();
        $('#datepicker').datepicker({
        endDate: FromEndDate,
        autoclose: true
    });
    </script>