class DateUtil {

    public static Date addDays(final Date date, int days) {
        if (days == 0) {
            return date;
        }

        if (date == null) {
            return null;
        }

        Calendar cal = GregorianCalendar.getInstance();
        cal.setTime(date);
        cal.add(Calendar.DAY_OF_MONTH, days);

        return cal.getTime();
    }

}