[tz] Fwd: DST changes in Hungary (full historical revision)

Paul Eggert eggert at cs.ucla.edu
Fri Jun 12 21:42:08 UTC 2020

On 6/12/20 2:09 AM, Michael H Deckers wrote:

>      For instance, the following story in the "Courrier de Saône-et-Loire"
>      1911-03-11, page 2, online at
> [https://www.retronews.fr/societe/echo-de-presse/2018/01/29/1911-change-lheure-de-paris]
>      only works if legal time was stepped back (was not monotone):

Thanks for this citation.

But this is curious, as that story also makes sense only if clocks were set back
at 00:00 "old time" - which is not what I installed yesterday in tzdb master
where clocks were set back at 00:09:21 "old time" so there was no difficulty
with the unfortunate hypothetical children in question.

This new citation suggests that it was more common for people to think of clocks
as being set back at midnight old time, which means we should revert to tzdb
2020a practice (while keeping the other changes you've suggested). In other
words, since the law doesn't specify how the transition occurred, if actual
practice varied and some people switched at midnight old-time, then tzdb should
leave the time blank (defaulting to 00:00) to hint that "0:00" would be

So I installed the attached proposed patch to try to do that. This patch also
incorporates the changes for Monaco you sent in your later email; thanks for those.
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