Java：使用LocalDateTime和ChronoUnit的时间差（以毫秒为单位）

我要计算两个LocalDateTime对象之间的时间差（以毫秒为单位）：

LocalDateTime startDate = LocalDateTime.of(2017, 11, 22, 21, 30, 30, 250);
LocalDateTime endDate = LocalDateTime.of(2017, 11, 22, 21, 30, 30, 252);
long diff = ChronoUnit.MILLIS.between(startDate, endDate)

不过，diff的值并不像我所期望的那样是2，而是0。发生什么事？

最佳答案：

LocalDateTime startDate = LocalDateTime.of(2017, 11, 22, 21, 30, 30, 250);
LocalDateTime endDate = LocalDateTime.of(2017, 11, 22, 21, 30, 30, 252);
long diff = ChronoUnit.NANOS.between(startDate, endDate);

System.out.println(diff);

产量：

2

我认为既然你在比较millis，那么diff就被舍入了。