Greece operates on Eastern European Time (EET) during winter months, which is 2 hours ahead of Coordinated Universal Time (UTC+2). During daylight saving time, observed from the last Sunday in March to the last Sunday in October, Greece switches to Eastern European Summer Time (EEST), which is UTC+3.
All of Greece follows the same timezone, including the mainland and all the islands. Major cities including Athens, Thessaloniki, Patras, and the islands of Crete, Santorini, and Mykonos all observe the same time.
Ancient Greeks were pioneers of timekeeping, inventing water clocks (clepsydra) and sundials. The word "clock" ultimately derives from the Greek word "klokka." Greece has over 6,000 islands, though only about 200 are inhabited. The Parthenon in Athens was built in 447 BC and remains one of the most recognizable monuments in the world.