ChronoUnit.MONTHS.between 不遵循半开方法

Question

我有 2 个 LocalDate，我想找出它们之间的区别：

LocalDate date1 = LocalDate.of(2018,11,30);
LocalDate date2 = LocalDate.of(2019, 5, 1);

当我执行时：

long mthsDiff = ChronoUnit.MONTHS.between(date1, date2);

这个return是5，但实际上应该是6。

为什么 ChronoUnit.MONTHS.between 不尊重 Half-Open approach？不应该是四月 return 个月 (2019-04-30) 吗？我错过了什么吗？

我知道第二个参数是排他性的。以下是我预期的情况：

date1 = 2018-11-16
date2 = 2019-04-15
expect 5

date1 = 2018-11-16
date2 = 2019-04-16
expect 5

date1 = 2018-11-16
date2 = 2019-04-17
expect 6

date1 = 2018-11-16
date2 = 2019-04-15
expect 5

Answer 1

我认为 the documentation 在这里说明了一切：

The calculation returns a whole number, representing the number of complete units between the two temporals. For example, the amount in hours between the times 11:30 and 13:29 will only be one hour as it is one minute short of two hours.

11 月 30 日到 5 月 1 日之间的整月数是 5:

十二月
1 月
二月
3 月
4 月

为什么你认为它应该是 6？半开就是说第一天包容，最后一天独享。除去 5 月 1 日什么都不做，整个 4 月都还在这个范围内。加上11月30日还不是整月，所以还是5.

Answer 2

正如文档所说 ChronoUnit.between

The calculation returns a whole number, representing the number of complete units between the two temporals.

和

// these two lines are equivalent
between = thisUnit.between(start, end);
between = start.until(end, thisUnit);

所以

之间有5个完整的月份

"2018-11-30"
December -> 1
January  -> 2
February -> 3
March    -> 4
May      -> 5
"2019-05-01"

ChronoUnit.MONTHS.between 不遵循半开方法

ChronoUnit.MONTHS.between not following Half-Open approach

java

java-time