独立于区域设置的年-周日期格式

Instant

我当前的设置是:

private String print(Instant i) {
    DateTimeFormatter formatter = DateTimeFormatter
            .ofPattern("YYYY-ww")
            .withZone(UTC);
    return formatter.format(i);
}

@Test
public void test() {
    System.out.format("First day of week      : %s%n",
            WeekFields.of(Locale.getDefault()).getFirstDayOfWeek());
    System.out.format("Min days in 1st week   : %s%n",
            WeekFields.of(Locale.getDefault()).getMinimalDaysInFirstWeek());
    Instant instant = Instant.parse("1998-12-31T00:00:00Z");
    System.out.println(print(instant));
}

First day of week      : SUNDAY
Min days in 1st week   : 1
1999-01

First day of week      : MONDAY
Min days in 1st week   : 4
1998-53

“de_de”区域设置与ISO设置一致,我知道我可以将格式化程序设置为

DateTimeFormatter formatter = DateTimeFormatter
        .ofPattern("YYYY-ww")
        .withZone(UTC)
        .withLocale(Locale.GERMANY);

但是,我可以在不指定绑定到特定国家的任何地区的情况下做到这一点吗?我找到了 java.time.temporal.WeekFields#ISO :

public static final WeekFields ISO = new WeekFields(DayOfWeek.MONDAY, 4);

这就是我想要的,但我不知道如何将其与 DateTimeFormatter .