By convention, 12 p.m. is noon and 12 a.m. is midnight. (Logically, since a.m. and p.m. mean before noon and after noon, they should both mean midnight, and 12 m. should mean noon. So much for logic.)
Wulff & Morgenthaler
By convention, 12 p.m. is noon and 12 a.m. is midnight. (Logically, since a.m. and p.m. mean before noon and after noon, they should both mean midnight, and 12 m. should mean noon. So much for logic.)