生日倒计时-今天 明天 几天后

好像没有现成的工具类提供，找AI写了个方法

public static String formatBirthday(String birthday) {
    // 解析出生日期（只取月日）
    LocalDate birthDate;
    try {
        birthDate = LocalDate.parse(birthday);
    } catch (DateTimeParseException e) {
        return birthday;
    }
    LocalDate today = LocalDate.now();

    // 构造今年的生日
    LocalDate thisYearBirthday = LocalDate.of(today.getYear(), birthDate.getMonth(), birthDate.getDayOfMonth());

    // 如果今年生日已过，考虑明年
    if (thisYearBirthday.isBefore(today)) {
        thisYearBirthday = thisYearBirthday.plusYears(1);
    }

    // 计算相差天数
    long daysUntil = ChronoUnit.DAYS.between(today, thisYearBirthday);

    if (daysUntil == 0) {
        return "今天";
    } else if (daysUntil == 1) {
        return "明天";
    } else if (daysUntil <= 7) {
        return daysUntil + "天后";
    } else {
        return thisYearBirthday.format(DateTimeFormatter.ofPattern("M月d日"));
    }
}