We were already having fun with that one over in the omnibus Aviation thread. See here & subsequent:
Funny enough, in a sense the hoverover / caption is sorta true.
From one POV typical 24-hour time designations (“military time” to Americans) are all assumed to be AM. If “everything is AM” means that “1100” is 11 hours after midnight, then it would also mean that “1300” is 13 hours after midnight. Which it really is. Hmmm.