[tz] New zone for DE, split from Europe/Berlin

[Tobias Conradi]

If one would use the proposal from the diff
> ! CH    +4723+00832    Europe/Zurich    Switzerland, Busingen Germany
> ! DE    +5230+01322    Europe/Berlin    Germany (except Busingen)
what is the meaning of the country code column then? Has there ever
been a tz zone that covered territory in more than one area defined by
a /current/ ISO 3166 country code edition?

I see this exists backward, e.g. Europe/Berlin and Asia/Aden each
cover areas that /have had attached/ ISO 3166 codes for two countries,
but I am not aware that a 1:n (n>1) relation for "tz zone" : "ISO
3166"-country ever existed at a point in time were the ISO 3166 codes
were still active.

Note: The first ISO 3166 country code list is reported to have been
published in 1974
(http://www.iso.org/iso/country_codes/background_on_iso_3166/development_of_iso_3166.htm)
i.e. ca. 4 year after the Unix epoch (1970-01-01 00:00:00 UTC), which
point in time after which the tz db aims to be correct according to
the Theory file.

Tobias

On Sat, Mar 3, 2012 at 6:12 PM, Arthur David Olson
<arthurdavidolson at gmail.com> wrote:
> Here's one possible way to reflect Busingen, Germany following Zurich rather
> than Berlin in 1980.
>
> Another possibility would be to add a...
>     DE    +474149+084125    Europe/Busingen
> ...line to "zone.tab" and a...
>     Link Europe/Zurich Europe/Busingen
> ...line in "europe"
>
> The Link could be avoided by adding a...
>     DE    +474149+084125    Europe/Zurich    Busingen
> ...line to "zone.tab" but that might confuse some readers
> (and could break anything out in the wild that relies on the third fields of
> "zone.tab" lines to be unique, as is true now).
>
>         --ado
....
> ! CH    +4723+00832    Europe/Zurich    Switzerland, Busingen Germany
....
> ! DE    +5230+01322    Europe/Berlin    Germany (except Busingen)




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Tobias Conradi
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