[tz] Recent conversions of zones to aliases

Lester Caine lester at lsces.co.uk
Fri Oct 3 19:58:15 UTC 2014

On 03/10/14 20:38, Guy Harris wrote:
> 1) have a database to map locations to tzids;
This is what geonames currently provides, but using the 'full' TSID list
from TZ currently.
That requires manual management of every locations setting, but there is
no getting away from that.
The coordinates for every location is also provided, which can be used
as required.
What is missing is the gap between what is valid data on TZ and the
actual location based history.

For example when Oxford switched from Oxford time to Europe/London and
in parallel when railway time was used at the station. Basically how to
add this historic data to the time offset system. There is a substantial
amount of data on top of 'Europe/London' in addition to the small amount
contained in backzone in relation to the other aliases which are
currently truncated to match Europe/London.

Lester Caine - G8HFL
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