请注意,该表达式System.out.println(Now.with(DayOfWeek.MONDAY))
使用ISO-8601,因此它与语言环境无关,因此它总是向后跳到上一个星期一(或保留在星期一,以防日期已经指向星期一)。
因此,在美国或其他一些国家/地区(星期从星期日开始)-可能无法按您预期的那样工作- 如果日期指向星期日,Now.with(DayOfWeek.MONDAY)
星期一。
如果您需要解决这些问题,最好使用本地化字段WeekFields.dayOfWeek():
LocalDate Now = LocalDate.Now();
TemporalField fieldISO = WeekFields.of(Locale.FRANCE).dayOfWeek();
System.out.println(Now.with(fieldISO, 1)); // 2015-02-09 (Monday)
TemporalField fieldUS = WeekFields.of(Locale.US).dayOfWeek();
System.out.println(Now.with(fieldUS, 1)); // 2015-02-08 (Sunday)
LocalDate ld = LocalDate.of(2017, 8, 18); // Friday as original date
System.out.println(
ld.with(DayOfWeek.SUNDAY)); // 2017-08-20 (2 days later according to ISO)
// Now let's again set the date to Sunday, but this time in a localized way...
// the method dayOfWeek() uses localized numbering (Sunday = 1 in US and = 7 in France)
System.out.println(ld.with(WeekFields.of(Locale.US).dayOfWeek(), 1L)); // 2017-08-13
System.out.println(ld.with(WeekFields.of(Locale.FRANCE).dayOfWeek(), 7L)); // 2017-08-20
以美国为例,这很清楚地表明,居住在美国的人会期望去到下一个而不是下一个星期日,因为星期日被认为是美国一周中的第一天。基于ISO的简单表达式with(DayOfWeek.SUNDAY)
忽略了此本地化问题。