The meridian is the line of longitude of the observer. When the Sun is highest in his sky it is local noon and, for an infinitesimal moment, neither ante meridiem nor post meridiem. His (12-hour) clock will read 12 and 00 simultaneously.
Another one of those people who doesn't know what am and pm mean.
They are Latin for ante- and post-meridiem.
Before and after noon.
12 noon is neither am nor pm - it's exactly on the meridiem.
11:59:59am is OK, 12:00:01pm is OK and 2 seconds later.
12:00:00 can't be am or pm. It's noon or midnight. I have seen people saying 11:59am to make it clear!
Farmers and outdoor workers in the far north will undoubtedly have a lie in in the morning so that they start work at dawn. Never mind what the clock says.
And I remember in midwinter walking to the bus stop in the dark morning, and walking back in the dark too. A different time shift would have allowed one of them to be in the light.
I know exactly what they mean and, while technically you are correct, by convention we do use 12am and 12pm to distinguish between them. Most people (here at least) would say see you at 12 if it was clear which was meant, just as we'd say see you at quarter-past-eleven. In both cases, we'd add am or pm if it wasn't obvious which half of the 24 hour day we were referring to. It is very rare that you'd here someone use midday and less rare to use midnight.
You might also hear 12 this afternoon or 12 tonight.
Indeed I remember visiting a German company in the 1970s, by the time we got in at 9.00pm the workers were just finishing their first coffee break. They clocked in at 6:30 a.m. As apprentices in UK we clocked in at 7:30 am.
What's so special about clock time anyway? Or '9 till 5'
It is simply that living at a different time to the majority causes problems - you can't arrive at work at 06:30, when the nursery doesn't open until 08:00 or the primary school until 08:50. You can't be in work for 06:30, when the first bus or train doesn't run until 07:15. You can't start noisy DIY, when all the neighbours don't wake up until 07:30 or 08:00. There are good reasons for the majority of people following the nationwide clock time. It synchronises (for most) their need for services and the provision of those services.
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