LocalDateTime.now() has different levels of precision on Windows and Mac machine

Question

When creating a new LocalDateTime using LocalDateTime.now() on my Mac and Windows machine i get a nano precision of 6 on my Mac an

Answer 1

I don’t think you can get any better precision than the one you are already getting. If you want to reduce the precision to match that of the other system, it’s straightforward (when you know how):

LocalDateTime.now(ZoneId.of("Europe/Berlin")).truncatedTo(ChronoUnit.MILLIS);

The precision you get depends on the hardware, the settings, the OS and the integration of the JVM with all of those. It’s well known that Mac generally offers better precision than Windows (though I was under the impression that this was only the case from Java 9, per OpenJDK issue # JDK‑8068730).