[y.winter]

Originally Posted by Marsh.

Not really.

00:00 is the start of a new day (am). Hence the clock resetting itself to 0.

12:00 is the start of the afternoon and is exactly halfway through the day (pm).

pm=after midday.
12:00 is midday exactly, so it can't be after or before itself.

[Marsh.]

Originally Posted by y.winter

pm=after midday.
12:00 is midday exactly, so it can't be after or before itself.

Yes midday. Midday is pm. As I said.

Just as midnight is am.