I once stayed up really late to see a tv show that was on at 12 PM. I pushed past 10 PM, 11 PM and ahh, finally 12 came. But to my confusion and eventual realization and surprise, it was 12 AM, not 12 PM. 12 PM = noon. 12 AM = midnight. 12 AM on Tuesday means Tuesday morning and Monday night. They should teach every little kid this to prevent them from having their tv hopes dashed with the switch of a letter.