4 ms·

I would have thought it's AM for the whole of the 12th hour. So 12:00 AM, 12:01 AM, 12:59 AM, 1:00 PM (hour one, past the hour of noon). An hour being a time sp

I would have thought it's AM for the whole of the 12th hour. So 12:00 AM, 12:01 AM, 12:59 AM, 1:00 PM (hour one, past the hour of noon). An hour being a time span of 60 minutes, not an instant! In the "correct" usage, you have an illogical jump between 11:59 AM and 12:00 PM.

softwarebeware 5y ago
Yes this is correct. It can be 12:28am, 12:43am, 12:55am, etc. And it rolls over from 11:59am to 12:00pm.