wrong end range in RANGE selection type

[yasfdany]

When I choose range day, end range always return one day after start range

this is my code :

CalendarDialog cal = new CalendarDialog(getActivity());
cal.setOnDaysSelectionListener(new OnDaysSelectionListener() {
@OverRide
public void onDaysSelected(List selectedDays) {
if (selectedDays.size()>0) {
checkin_date = selectedDays.get(0).getCalendar().getTime();
checkin_string_date = formatMonth.format(checkin_date)+"/"+formatDay.format(checkin_date)+"/"+formatYear.format(checkin_date);
tanggalin.setText(ExtradateFormatForMonth.format(checkin_date));

                if (selectedDays.size()>1)
                {
                    checkout_date = selectedDays.get(1).getCalendar().getTime();
                    checkout_string_date = formatMonth.format(checkout_date)+"/"+formatDay.format(checkout_date)+"/"+formatYear.format(checkout_date);
                    tanggalout.setText(ExtradateFormatForMonth.format(checkout_date));
                }

            }
        }
    });

cal.show();
cal.setSelectionType(SelectionType.RANGE);