public static String getDate(Date strDate) {        String date = null;        if (strDate!= null) {            Calendar startTime = Calendar.getInstance();            int year = startTime.get(Calendar.YEAR) - 20;            // 这里初始化时间，然后设置年份。只以年份为基准，不看时间            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;    }