Some modifications of China related timezone info.

[Paul Eggert]

"Paul Schauble" <Paul.Schauble at ticketmaster.com> writes:

> what's wrong with calling the tz zone Asia/China

That would be an inaccurate name, since the zone in question does not
include Heilongjiang, Gansu, Guizhou, Sichuan, Yunnan, and lots of
other parts of modern-day China.  And it would be an unwise name
choice even if it were accurate today, since it's possible that China
will split into multiple time zones in the not-so-distant future.

As for James Su's question as to why we don't use the name
'Asia/Chongqing': we do.  That is, we already have another zone by
that name.  The clocks in Chongqing and Shanghai have not always
agreed since 1970, so the two locations use different zones.  We have
those two zones for the same reason we have two zones for New York and
Indianapolis.

> I agree with the drawbacks of using the most populated city as a proxy
> for a time zone.

The current scheme has drawbacks, yes.  But long ago we tried the
approach you're suggesting.  That is, we based the name on some
more-political entity than a city name.  For example, we used "W-SU"
for the western Soviet Union and "GB-Eire" for the British Isles.
Unfortunately this approach also has problems, and that is why we
switched.