China time zone

Tim Parenti tim at
Thu Aug 18 16:24:26 UTC 2011

For the areas in which existing tz database zones apply, Eric Muller's
shapefiles at are public domain and would
certainly provide a good starting point for any project seeking to enhance
historical accuracy.

Tim Parenti

On Thu, Aug 18, 2011 at 11:15, Alois Treindl <alois at> wrote:

> On 18.08.11 04:46, Paul Eggert wrote:
>> Yes, the situation in China was quite different back then,
>> but luckily for us our cutoff date is the POSIX epoch
>> of 1970-01-01 00:00:00 UTC.  In the tz database we don't
>> create a new zone merely because some locality had
>> different clocks before 1970.  If we did, we'd need
>> hundreds of zones for Indiana alone.
> We (a group of timezone researchers for astrology purposes) are planning to
> do exactly that, create the required 300+ Indiana zones (Shanks/Pottenger
> uses 350+ but is not complete), to cover pre-1970 Indiana timezone history.
> It will take a lot of work and we understand that these extra zone will not
> get entry into standard tzdata file distribution. But I think if we maintain
> a separate 'history' zone fileset outside, tzcode will work with these extra
> zones of we include them in the zic compilation step.
> For China as well.
> Writing the zone files is only one part of the work, the other is
> describing precisely for which area the extra zones apply, and which area is
> covered by the existing standard tzdata zones.
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