[tz] TZDB use cases

Jacob Pratt jacob at jhpratt.dev
Tue Oct 5 04:32:49 UTC 2021

At least with regard to US states, internal state borders do *not* change
when rivers change course. It is my understanding that they do commonly
change for international borders, including along the Rio Grande. To my
knowledge rivers changing course has never caused a significant change of
population, let alone one on a time zone boundary.

Jacob Pratt

On Tue, Oct 5, 2021, 00:26 Hal Murray via tz <tz at iana.org> wrote:

> Stephen Colebourne said:
> > So, it turns out that there is, I believe, a critical difference here
> between
> > the US view of timezones and the European one. In the US, timezones do
> not
> > follow the boundary of the whole country, nor even States. In Europe, by
> > contrast, timezone boundaries are very much driven by country
> boundaries.
> There is another interesting difference.  US borders are stable.
> Czechoslovakia and Yugoslavia have split post 1970.  Did all the pieces
> retain
> the same TZ info?
> I think small regions on the France/German border changed sides after WW
> 1.
> Are there others?  Anything similar post 1970?
> Have any US/state borders changed when rivers changed their course?  If
> so, do
> any people live in the regions that changed and/or did anything
> interesting
> happen there?
> --
> These are my opinions.  I hate spam.
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