[LEAPSECS] Windows Server 2019

[Stephen Colebourne]

"In addition, there is no standard method for applying this frequency
adjustment, so that different implementations may disagree among
themselves in addition to the time error with respect to UTC."

As a IT professional, and author of date/time libraries, I cannot
stress enough how much a standard is needed here. We are going to have
both UTC (with leap seconds) and systems that smear ("UT-Smear") and
there is currently no agreed way to define the latter or move from one
to the other. I strongly suspect that Microsoft is going to have to
define a smear in order to meet old APIs, but this really should be
something well defined by a standard, not invented by a company.

Stephen



On 18 July 2018 at 23:07, Steve Allen <sla at ucolick.org> wrote:
> as seen on slashdot and more, Windows Server 2019 will support leap seconds.
> https://blogs.technet.microsoft.com/networking/2018/07/18/top10-ws2019-hatime/
> That blog entry points at several MSword docs for admins and devs, and
> https://aka.ms/Dev-LeapSecond
> finishes with this interesting warning:
>
> Known issues:
> Some frameworks are known to calculate time incorrectly after a leap
> second occurs.  For example, the .NET Framework uses its own internal
> logic to determine what time it is.  Its logic does not account for
> leap seconds.  So after a leap second is introduced to the Operating
> System the output of "System.DateTime.Now.ToString()" will be ahead by
> one second of the local system time.  (We are working with the .NET
> framework team on this.)
>
> In combination with the many steps that it takes to configure Windows
> this sounds like there will be some really interesting results.
>
> --
> Steve Allen                    <sla at ucolick.org>              WGS-84 (GPS)
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