LOCALDATE minus einer Periode erhalten falsches Ergebnis

LocalDateminus ein Period(wie „28 Jahre, 1 Monat und 27 Tage“), erhalten falsches Ergebnis.

Aber minus ein Period(nur Tage - Einheit hat, wie „10282“ Tage) erhalten richtiges Ergebnis. Gibt es etwas zu bemerken?

public static void main(String[] args) {
    printAgeAndBirthday(1989, 2, 22);

    printBirthdayFromPeriod(28, 1, 27);
}
  private static void printBirthdayFromPeriod(int years, int months, int days) {
    final Period period = Period.of(years, months, days);
    final LocalDate now = LocalDate.now();
    final LocalDate birthday = now.minus(28, ChronoUnit.YEARS)
            .minus(1, ChronoUnit.MONTHS)
            .minus(27, ChronoUnit.DAYS);

    System.out.println("your birthday is : "+ birthday);//1989-02-19
    System.out.println("your birthday is : "+ now.minusYears(28).minusMonths(1).minusDays(27));//1989-02-19
    System.out.println("your birthday is : "+ now.minus(period));//1989-02-19
    System.out.println("your birthday is : "+period.subtractFrom(now));//1989-02-19
    System.out.println("your birthday is : "+ now.minus(Period.ofDays(10282)));//1989-02-22
}

private static void printAgeAndBirthday(int year, int month, int dayOfMonth) {
    LocalDate today = LocalDate.now();
    LocalDate birthday = LocalDate.of(year, month, dayOfMonth);

    Period p = Period.between(birthday, today);
    long p2 = ChronoUnit.DAYS.between(birthday, today);
    System.out.printf("You are %d years, %d months, and %d days old. (%d days total)%n",
            p.getYears(), p.getMonths(), p.getDays(), p2);

    LocalDate nextBDay = birthday.withYear(today.getYear());

    //If your birthday has occurred this year already, add 1 to the year.
    if (nextBDay.isBefore(today) || nextBDay.isEqual(today)) {
        nextBDay = nextBDay.plusYears(1);
    }

    Period p_1 = Period.between(today, nextBDay);
    long p_2 = ChronoUnit.DAYS.between(today, nextBDay);
    System.out.printf("There are %d months, and %d days until your next birthday. (%d total)%n",
            p_1.getMonths(), p_1.getDays(), p_2);
}

das Konsolenprotokoll:

You are 28 years, 1 months, and 27 days old. (10282 days total)
There are 10 months, and 4 days until your next birthday. (310 total)
your birthday is : 1989-02-19
your birthday is : 1989-02-19
your birthday is : 1989-02-19
your birthday is : 1989-02-19
your birthday is : 1989-02-22

Java-Version: jdk1.8.0_45