Time-24 hour clock

I know not how but the boy can now read the 24 hour clock. I accidentally found out one day when he just blurted to me that 15:43 means 3:43. I can't quite figure out who taught him, he isn't very clear either. But, who cares! I just love it that he knows this since our clock in the living room is a 24-hr digital clock! WOOT!