In some African countries such as Tanzania and Ethiopia, people count the hours from dawn to dusk. Hence, 6:00 am EAT (East African Time) equals 0:00 in Daylight Hours. It is important to keep this in mind when making appointments. So beware when buying a bus ticket!
More special to Ethiopia (and Eritrea) is the calendar. Their new year starts on the 11th of September, just to make things more complicated 😉