1. In kirundi (a common language in Burundi) there is one word for both yesterday and tomorrow. They don't confuse the meaning because of the context of the sentence. But when my friend speaking Kirundi spoke french with me on the phone, he often interchanged the two... I never knew if he would visit the next day or had already visited me.
http://amajambo.ijuru.com/?q=yesterday&lang=en&start=0 http://amajambo.ijuru.com/?q=tomorrow&lang=en&start=0
2. In swahili (at least in Tanzania), time is told inversly. Think of a circular clock where the 12 o'clock is 6 o'clock, 3 o'clock is 9 o'clock. 9 o'clock is 3 o'clock. Yes it was very confusing to me, but you can get used to anything.