Back in ~1961 an obnoxious elementary school student was arguing with his teacher. The topic? Whether "12 A.M." corresponds to noon or midnight. Who cares? Well, that precocious kid did. He had read something about it in an introductory astronomy book and was sure that he was right and his elder was wrong.
Of course it's simply a matter of definition, quite arbitrary and unimportant. The little twit didn't realize that.
Yep, you guessed it: I was that child. Belated apologies ...
I decided that it wasn't worth arguing over, so I just write 12n for noon and 12m for midnight :) -- LapisMouse