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

You can set the precision using a formatter, without resorting to truncatedTo or Clock.tickMillis:

jshell> OffsetDateTime.now().format(ISO_DATE_TIME)
$5 ==> "2020-10-21T10:13:48.57776451+02:00"

jshell> OffsetDateTime.now().format(ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSZ"))
$8 ==> "2020-10-21T10:15:31.27+0200"

I realized this after discovering that JDK 15 has different precision on macOS and Linux.