[tz] Preparing to fork tzdb

[Philip Paeps]

On 2021-09-23 12:29:06 (+0800), dpatte via tz wrote:
> I am aware that montreal was moved to back zone because its post 1970 
> data after research turned out to match toronto.But I have yet to get 
> a clear answer as to whether we can request modifications to backzone 
> records even if they only affect pre1970 clocks, and whether we can 
> add new backzones for regions that differ before 1970. 

Changes are routinely made to backzone, backed up with verifiable 
documentation and commentary.

https://github.com/eggert/tz/commits/main/backzone

Philip

-- 
Philip Paeps
Senior Reality Engineer
Alternative Enterprises