Most Mediterranean Europe countries are on Central European Time (GMT/UTC plus one hour) except for Portugal, which runs on Western European Time (GMT/UTC), and Greece and Turkey, which are on Eastern European Time (GMT/UTC plus two hours).

In most European countries, clocks are put forward one hour for daylight-saving time on the last Sunday in March and turned back again on the last Sunday in October. Thus, during daylight-saving time, Western European Time is GMT/UTC plus one hour, Central European Time GMT/UTC plus two hours and Eastern European Time GMT/UTC plus three hours.