12 hour. Iunno, I don't see the point of 24. They both tell the same time, just in a different manner. (And yes, that does work vice-versa, but I was raised with 12 hour.)
But, meh. I can tell time on both anyways, and translate them pretty well from one to the other, but i'm faster with a 12 AM/PM then 24.
But, meh. I can tell time on both anyways, and translate them pretty well from one to the other, but i'm faster with a 12 AM/PM then 24.