[tz] timezone Verschlimmbesserung
eggert at cs.ucla.edu
Tue Oct 5 17:10:33 UTC 2021
On 10/4/21 12:59 PM, Steffen Nurpmeso via tz wrote:
> (It would surely be doable to use tooling to automatically unite
> all zones which are identical post-1970, maybe give that an
> auto-generated name, and make all actual TZIDs which point to that
> data links automatically.)
I wrote such a tool to generate the May proposal, except that I didn't
invent new names as I thought that would entail unnecessary complexity
and confusion. It was kind of a hack, though, and not worth publishing.
> What really bugs me with the current post-1970-matters rule is
> that the "ZFLAGS='-r @0'" option is neither default nor
> prominently documented.
Making it the default would be a big lift, as people have expressed
concern about churn in pre-1970 data. In hindsight perhaps we should
have omitted pre-1970 data from the start (it sure would have saved me a
lot of ill-spent time ...) but the backward-compatibility concerns do
exist even if they're perhaps overblown.
> Also that tzselect(8) gives the name of the actually really used
> zone instead of the name that was used
Could you explain more about this issue? I don't see how a "name that
was used" is involved here. When a user starts up tzselect, there is no
name yet. tzselect is supposed to let you choose a name de novo.
Perhaps you could show a sample tzselect session and explain where it
As for the importance of astrological use of the tzdb main entries -
tzdb has never been remotely adequate for pre-1970 timestamps, and I see
no movement on the horizon to fix this. I have asked an astrologer or
two for help on this topic with no results, not that I expected any; any
effort in this area would have to be huge to get decent coverage.
Here's one way to think about it. After about 40 years of volunteer
work, we have reasonable coverage for casting horoscopes for people aged
50 or less. On current trends we can solve the problem of casting
horoscopes for living persons, simply by doing nothing for the next 40
years or so. Perhaps that's not ideal for astrologers, but it's pretty
good bang for the buck.
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