java獲取年份的后兩位

public static String getDate(Date strDate) {
        String date = null;
        if (strDate!= null) {
            Calendar startTime = Calendar.getInstance();
            int year = startTime.get(Calendar.YEAR) - 20;
            // 這里初始化時間，然后設置年份。只以年份為基准，不看時間
            startTime.clear();
            startTime.set(Calendar.YEAR, year);
            SimpleDateFormat formatter = new SimpleDateFormat("yyMM");
            formatter.setLenient(false);
            formatter.set2DigitYearStart(startTime.getTime());
            try {
                date = formatter.format(strDate);
            }
            catch (Exception e) {
            }
        }
        return date;
    }