[LEAPSECS] CCTF reported to CIPM last month and it's interesting!

[Michael Wouters]

.>> The 2028 option is there if it looks less likely that there will be a
positive leap second
I meant negative, of course.

Poul-Henning Kamp asked:
Does anybody here know what the precise legal path is from CPGM to
the BIPM Director's inbox ?

The CCTF, CIPM, CGPM and BIPM all exist under the Metre Convention.
Signatories to the Metre Convention pay an annual subscription that funds
the operation of the BIPM, among other obligations.
So there is no "legal path" insofar as the BIPM is part of the same entity
and exists to implement the decisions of the CGPM.

Michael



On Wed, Dec 3, 2025 at 11:33 AM Michael Wouters <michaeljwouters at gmail.com>
wrote:

> Hello
>
> The 2028 option is there if it looks less likely that there will be a
> positive leap second than was estimated earlier this year. It is there to
> allow a bit more time for adapting to the new UT1-UTC tolerance,  if the
> risk is acceptable.
>
> Regards
> Michael
>
> On Wed, 3 Dec 2025 at 2:46 am, Poul-Henning Kamp <phk at phk.freebsd.dk>
> wrote:
>
>> --------
>> Magnus Danielson writes:
>>
>> > For the record, when ITU-T Q13/15 had BIPM as invited guest to discuss
>> > consequences of negative leapseconds, we in Q13 strongly recommended
>> > that a wider tolerance for UT1-UTC difference be implemented sooner, to
>> > avoid negative leapsecons, as we forsee a larger set of consequence
>> than
>> > for positive leapseconds, even if some testing have been done.
>>
>> That's why the 2028 option puzzles me?
>>
>> Nothing in their presentation even hints that somebody has as much
>> as vaguely speculated that 2027 might be too early ?
>>
>> I wonder if it is simply a legal/procedure thing ?
>>
>> Does anybody here know what the precise legal path is from CPGM to
>> the BIPM Director's inbox ?
>>
>> Does it to go through both IAU and ITU ?
>>
>>
>> --
>> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
>> phk at FreeBSD.ORG         | TCP/IP since RFC 956
>> FreeBSD committer       | BSD since 4.3-tahoe
>> Never attribute to malice what can adequately be explained by
>> incompetence.
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>
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