[tz] Merged 1970+ time zones should always return -1 pre-1970

[Derick Rethans]

On Tue, 28 Sep 2021, Brian Inglis via tz wrote:

> I think for all zones with data merged prior to 1970, the data and API should
> always return *-1* for all times prior to 1970-01-01 00:00:00Z, as anything
> else is inaccurate or a kludge.

That is only an option if you use the code bundled with the data. I 
can't simply change PHP to throw a "can't have this Date" exception for 
pre-1970 timestamps. And removing/changing the already existing timezone 
information to either that of a different country or UTC, is also not 
practical. It is a backwards compatibiliy break that I *will* get emails 
about.

cheers,
Derick

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