public static String getNextDate(String sdf,String dateString) {
        Calendar now_Time = Calendar.getInstance();
        DateFormat df=new SimpleDateFormat(sdf);
        try {
            now_Time.setTime(df.parse(dateString));
        } catch (ParseException e) {
            // TODO 自动生成 catch 块
            e.printStackTrace();
        }
        now_Time.add(Calendar.DATE,1);
        SimpleDateFormat sdNowDate = new SimpleDateFormat(sdf);
        return sdNowDate.format(now_Time.getTime());
    }