How to look up historical time zones by date and location

[Grant Edwards]

On 2014-08-18, Ian Kelly <ian.g.kelly at gmail.com> wrote:

> By working with dates far enough in the past that the modern time zone
> rules don't apply. Some experimentation determines that the timedelta
> between Shanghai and Urumqi goes from 136 minutes to 120 minutes in
> 1928, and then from 120 minutes to 0 minutes in 1980.

Thanks to politicians who keep mucking about with such things as a way
to appear busy while still avoiding doing anything useful, it's no
small feat to handle current timezones correctly.  Expecting them to
work for dates/times from long ago is pretty much beyond the pale.

-- 
Grant