Ante Meridiem and Post Meridiem

It has been internationally established that a new day begins at 12:00 midnight, marking the transition from one day to the next. From that moment, the clock displays the time for the new day.
In the 12-hour clock system, time is measured in two cycles of 12 hours each:

1. Midnight to Noon: The hours are counted in sequential order from 12:00 (midnight) to 1:00, 2:00, 3:00, and so on, up to 12:00 noon. This period is referred to as ante meridiem (a.m.), meaning "before midday."
2. Noon to Midnight: After 12:00 noon, the cycle repeats from 1:00, 2:00, 3:00, continuing up to 12:00 midnight. This period is referred to as post meridiem (p.m.), meaning "after midday."