There was a thread just last week when Great Britain changed their clocks.

I think all of Western Europe does. I think in the past they did no all change at the same time; so while normally GtBr & France are an hour different there were times when there was 2 hours difference. I don't know if this is still the case, or if the EU countries all change the same time.

Here's a list for when DST is beginning & ending in various cities.