NTP, UTC, and (negative) leap seconds

David Magda dmagda+stable at ee.ryerson.ca
Fri Nov 20 00:51:02 UTC 2020


Hello,

So there was a recent weblog post on a timekeeping observation:

	https://fanf.dreamwidth.org/133823.html
	https://news.ycombinator.com/item?id=25145870  (via)
	https://en.wikipedia.org/wiki/Leap_second

In all circumstances in the past, leap seconds were added:

	23:59:57Z
	23:59:58
	23:59:59
	23:59:60
	00:00:00
	00:00:01

The post brings up the possibility of a “negative” leap second, i.e., a skip:

	23:59:57Z
	23:59:58
	00:00:00
	00:00:01

Has anyone tested this scenario on FreeBSD?

Thanks for any info.

--
David Magda


More information about the freebsd-stable mailing list