Re: [tz] Irish Standard Time vs Irish Summer Time

Lester Caine wrote:

so should there be any timezones other than a single European time in the tzdb database?

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. So time zone histories that differ in the 1970-1976 period require different Zones regardless of EU rules after 1977.