[LEAPSECS] Windows Server 2019

[Warner Losh]

On Mon, Jul 23, 2018 at 12:52 PM, Steve Allen <sla at ucolick.org> wrote:

> On Mon 2018-07-23T13:58:49-0400 Stephen Scott hath writ:
> > I have not found any specifications or official documents that specify
> that
> > the leap second shall be incorporated just before the time instant
> midnight
> > UTC for all UTC offset timescales.
>
> There is no authority for "all UTC offset timescales."
> All local times are decided by local jurisdictions.
> This is an issue long treated in the IANA tz mail list which
> is a community effort that makes best effort to track every
> little change made by every legislature and bureaucrat.


This is more an absence of a thing. There's plenty of laws that say it's a
fixed offset from UTC or some other approximation of Mean Solar Time which
everybody construes to mean UTC these days (even if a pedantic reading
doesn't lean one here). In the absence of setting a local time for the leap
second, the offset is controlling and therefore it happens at UTC midnight,
since it's definitely and unambiguously defined in ITU-R TF 460-6 as such
(all known earlier revisions too, I believe was the conclusion when a
similar issue was raised years ago on this list, though I think -3 was the
oldest that could be found at that time).

Warner
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