code: public static String dateIncreaseByYearforString(String date, int mnt) {
          Date date1 = stringToDate(date);
          Calendar cal = GregorianCalendar.getInstance();
          cal.setTime(date1);
          cal.add(Calendar.YEAR, mnt);
          String ss = dateToString(cal.getTime(), ISO_DATE_FORMAT);
          return dateIncreaseByDay(ss, -1);
      }
docs: 日期增加-按年增加
  
  @param date
  @param mnt
  @return java.util.Date