rdv :
I want to calculate the time difference in milliseconds between two LocalDateTime objects:
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)
However, the value for diff is not 2, as I would expect, but 0. What's going on?
Nick DeFazio :
I think the last param there is actually nano seconds: https://docs.oracle.com/javase/8/docs/api/java/time/LocalDateTime.html#of-int-java.time.Month-int-int-int-int-int-
Switching to a diff of nanos output 2 in my case:
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);
Yields:
2
I think that since you are comparing millis, the diff is being rounded down.
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