計算出生幾天幾年
String[] birthdayArr = birthdayCell.getStringCellValue().split("/");
LocalDate birthday = LoaclDate.of(new Integer(birthdayArr[0]), new Integer(birthdayArr[1]), new Integer(birthdayArr[2]));
LocalDate toDay = LocalDate.now();
Period diff = Period.between(birthday, toDay);
String diffStr = diff.getYears() + "年" + diff.getMonths() + "個月";
diffStr = diffStr.replace("0年", "");