Western Europe should be 2-3
Portugal and Ireland are an hour behind the main block of EU countries (CET), Spain should be as well but General Franco decreed that his country should be in the same timezone as his hero (Adolf Hitler) and they never changed it back after he died. I suppose France should also be in the same time zone as Portugal, Ireland and the UK but that probably has more to with wanting to have the same time as the rest of the original EU (called Common Market then) rather than a desire to have Adolf Hitler time.
Finland, the Baltic countries, Romania, Bulgaria and Greece are all an hour ahead of CET.
some countries are 1AM, some are 2AM, some are 3AM.
Are the 1AM ones Portugal and Ireland, the 2AM crew those on CET and the 3AM ones the next block? That would mean they would shift their clocks at the exact same time.