[tz] Irish Standard Time vs Irish Summer Time

[Clive D.W. Feather]

Paul Eggert said:
> Yes, of course. The EU rules cover multiple time zones and the tzdata format 
> needs different Zones for each. But it's more than that: the EU didn't 
> standardize daylight-saving transition rules until 1977.

1980, coming into effect in 1981.

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