The logic goes like this:
1. Ethiopia is near the equator, so day and night are roughly twelve hours long year round.
2. Most activities here are determined by whether it is light or dark outside.
Therefore, the most practical reference points for telling time are sunrise and sunset rather than the notion of noon and midnight. For example, one hour after sunrise is one o’clock in the morning (7 o’clock am international time)… and one hour after sunset is one o’clock at night (7 o’clock pm international time). Brilliant!
The only problem is that both systems are used in Ethiopia, so you must be clear which time reference you are using when you try to schedule things with the locals!