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Date:      Thu, 19 Nov 2020 19:50:52 -0500
From:      David Magda <dmagda+stable@ee.ryerson.ca>
To:        freebsd-stable <freebsd-stable@freebsd.org>
Subject:   NTP, UTC, and (negative) leap seconds
Message-ID:  <64E52A56-4C8F-4B9E-A4D3-33117C270D43@ee.ryerson.ca>
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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
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