> > I hope it serves your purpose.
>
> It does not directly, but I can work with it. I guess I'll need to extract 
> "main guy" for the equivalence class from the zonenow.tab file. Though, if 
> it's generated automatically, is there a "main guy" in the class? Or being 
> "main" (the one present in zonenow.tab) is defined by it being first in the 
> source?

I am afraid there is no concept of "main guy" there. I raised a
similar issue in this list recently. My constraints were a bit
different (I wanted to have at least one distinct zone per country)
but I also needed a way to find out which was the "main" zone, given a
set of zones that have equivalent behaviour if historic data is not
relevant.

You can have a look at that thread in the list archives
(https://lists.iana.org/hyperkitty/list/[email protected]/thread/RDI2IRJBQZWQHKVPLJP4I6EWBV6TY2FO/).
The result of that discussion was that a reasonable approach would be
to sort each set of equivalent time zones by population, and take the
one with the most population as the "main one" in the group.

This was useful advice, but I am not 100% convinced this is the way I
want to go, so I am still investigating options.

Best regards,

Guillermo Rodriguez Garcia
[email protected]

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