> The times should be divided into 0:00 AM through 11:59 AM and 0:00 PM through 11:59 PM so that the hours wrap around at the AM/PM boundary, not one hour later

> The times should be divided into 0:00 AM through 11:59 AM and 0:00 PM through 11:59 PM so that the hours wrap around at the AM/PM boundary, not one hour later. Sure, although, if we're re-defining how people tell time anyway, we might as well use a 24-hour clock and so avoid the need for AM/PM at all; and, even if we do that, there is still, inevitably, the confusion about on what day 00:00 AM falls. My point was just that not knowing that "12 PM" means noon is a matter of not being aware of an arbitrary convention, rather than of not understanding the concept of AM vs. PM. (Indeed, arguably it is a matter of understanding their meaning all too well!)