daterangepicker for Bootstrap // configure startDate and endDate

From a driver in laravel I am sending a date to a view with the format YYYY-MM-DD , but I can not make it appear in the daterangepicker , I understand it is a problem format, but I could not find the solution .. For now I am passing the values through hidden fields in the form.

Using a alert to show the value of the variable is correct, but I can not get it to load dynamically, however, further down in the callback function in the same line of code is loaded correctly.

<script type="text/javascript">
$(function() {
    var start = new Date(document.getElementById("startDate").value);
    var end = new Date(document.getElementById("endDate").value);

    function cb(start, end) {
        $('#reportrange span').html(start.format('MMMM D, YYYY') + ' - ' + end.format('MMMM D, YYYY'));
        document.getElementById("startDate").value=start.format('YYYY-MM-DD');
        document.getElementById("endDate").value=end.format('YYYY-MM-DD');
    }

    $('#reportrange').daterangepicker({
        startDate: start,
        endDate: end,
        ranges: {
           'Today': [moment(), moment()],
           'Yesterday': [moment().subtract(1, 'days'), moment().subtract(1, 'days')],
           'Last 7 Days': [moment().subtract(6, 'days'), moment()],
           'Last 30 Days': [moment().subtract(29, 'days'), moment()],
           'This Month': [moment().startOf('month'), moment().endOf('month')],
           'Last Month': [moment().subtract(1, 'month').startOf('month'), moment().subtract(1, 'month').endOf('month')]
        }
    }, 
        callback
    );
    function callback(start, end) {
        $('#reportrange span').html(start.format('MMMM D, YYYY') + ' - ' + end.format('MMMM D, YYYY'));
        document.getElementById("startDate").value=start.format('YYYY-MM-DD');
        document.getElementById("endDate").value=end.format('YYYY-MM-DD');
    }


});
</script>