Time Zones of the EU

With the addition of ten members to the EU on May 1, the EU had to determine a key issue - in which time zone does May 1 begin? While the newest of the EU countries are in the east and are an hour ahead of much of Europe, the official change took place at midnight in the Rome and Luxembourg time zone because those are the locations of the EU's founding treaty and where the EU's official journal is published, respectively. Nonetheless, Estonia, Latvia and Lithuania, and Cyprus still celebrated an hour before the "official" change.