[tz] Introduce Etc/UTC+x timezones?

[Steve Allen]

On Tue 2023-05-02T17:19:06+0200 Benjamin Drung via tz hath writ:
> Draft: "Please select the offset corresponding to your time zone.
> Contrary to UTC, positive values to GMT refer to zones west to Greenwich
> and negative values to east to Greenwich (e.g. UTC-6 = GMT+6). Time
> zone: GMT, GMT+0, GMT+1, ..., GMT-9, Greenwich, UCT, UTC, Universal,
> Zulu".

Because of its defining expression UT has been departing from GMT for
120 years, but the difference remains inconsequentially small.

The wording above will get more complicated by mid 21st century as UTC
deviates notably from GMT.

--
Steve Allen                    <sla at ucolick.org>              WGS-84 (GPS)
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