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", "");