I know that in the USA 11am is followed by 12pm (midnight!) but n.

[12pm ain't 12am]

Can we have the option for the correct descriptors for times in the day i.e.
11am, 12am, 1pm, not 11am, 12pm(midnight), 1pm. The last mentioned leads to
some crazy problems when making out diaries.

At least the option!

 

[Sue Mosher [MVP-Outlook]]

Midnight is 12 a.m. Noon is 12 p.m.

 

[AlfD]

There's a clear logic to moving from 11.00 am to 11.59 a.m. to
12.00p.m.

1. The instant noon arrives it becomes afternoon.
2. p.m. (post meridiem) denotes afternoon, which it has become even
before 12.00.01 arrives.
3. At the other end of the day, the same considerations apply: as soon
as midnight arrives, it becomes a.m., long before 12.01 a.m. arrives.

As for having options: it was the arrival of steam locomotion and
railways which led to the standardisation of time. Can't really see it
falling apart again...

Alf