获取未来第几天的日期

    /**
     * 获取未来 第 past 天的日期
     * 
     * @param past
     * @return
     */
    public static Date getFetureDate(int past) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.DAY_OF_YEAR, calendar.get(Calendar.DAY_OF_YEAR) + past);
        Date today = calendar.getTime();
        return today;
    }