I've read the entire thread and honestly, I think we all need to respect other people's ways of doing things even if it doesn't agree with ours. You want to learn somebody's language, you have to play by their rules. If you don't, you are short changing yourself. If they say Saa tatu is means the 3rd hour I.e 9 o'clock, Then so be it! In the end you want to communicate with them and you can't go to Tanzania and set up a meeting for 9am saying "Saa tisa Asubuhi"... At best they'll show up at 3pm (which is actually Saa tisa Usiku if I'm right)... In the end, it's your loss.