[tz] OpenJDK/CLDR/ICU/Joda issues with Ireland change

[Clive D.W. Feather]

Guy Harris said:
> 1. The ISO C API (localtime()) has a notion of "Daylight Saving Time" being in effect or not in effect, which controls whether tm_isdst is set or not.

Right.

> "Daylight Saving Time" presumably refers to turning clocks forward.

No. That's not stated anywhere in ISO C - it's an assumption you've made.

Given that, the rest of our argument falls apart.

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