[tz] leap_second.list not updated after latest IERS Bulletin C

Martin Burnicki martin.burnicki at meinberg.de
Fri Dec 15 09:31:07 UTC 2023

Paul Eggert via tz:
> On 12/9/23 13:30, Tim Parenti wrote:
>> It still falls short, though.
>> of the ideal that the leap-seconds.list file itself also contain the 
>> notice
>> so we (and others) don't have to duplicate it elsewhere:
>> https://mm.icann.org/pipermail/tz/2017-April/024988.html
>> It also doesn't necessarily allay the other concerns.
> Perhaps we could work around the copyright-notice problem by adding 
> appropriate verbiage to the LICENSE file. This would require some 
> thinking, though.
> One other problem just occurred to me. Since the IERS variant of 
> leap-seconds.list is not public domain, putting it into tzdata would 
> contradict Internet RFC 6557 section 7 "Data Ownership"[1], which says 
> that tzdata is public domain and therefore is exempt from a bunch of 
> rules that I'm not familiar with and would rather not become expert in 
> if I can avoid it. I suppose this could be worked around by writing a 
> new RFC that addresses this issue but that'd surely be a good bit of 
> work in its own right.

It was me who has asked the folks at IERS some years ago to start 
providing a leap second file in the format expected by ntpd, and in fact 
they did, and since that time, an updated file was always available as 
soon as a new Bulletin C had been published.

It was me who asked the folks at IERS a few years ago to start providing 
a leap second file in the format expected by ntpd, and sure enough they 
did, and since then an updated file has always been available 
immediately whenever a new Bulletin C had been published.

I remember there has already been a discussion here about the "public 
domain" requirement shortly after the IERS had started to provide their 
version of a leap second file.

I have been in touch with some people at IERS who are working on this 
and they have been very cooperative throughout.

I'm pretty sure they have no problem making the file "public domain" but 
the question arises as to what wording should be used to express this in 
a way that will be accepted by the TZ DB project.

Has anyone ever suggested a formulation that meets the requirement of 
the TZDB project, and told them why this was a requirement? I have no 
doubt that the folks at IERS would pick it up and integrate it.

Martin Burnicki

Senior Software Engineer

MEINBERG Funkuhren GmbH & Co. KG
Email: martin.burnicki at meinberg.de
Phone: +49 5281 9309-414
Linkedin: https://www.linkedin.com/in/martinburnicki/

Lange Wand 9, 31812 Bad Pyrmont, Germany
Amtsgericht Hannover 17HRA 100322
Geschäftsführer/Managing Directors: Günter Meinberg, Werner Meinberg, 
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