The 12-hour clock divides the day into two periods: a.m. (ante meridiem) for times from midnight to noon, and p.m. (post meridiem) for times from noon to midnight. Each period consists of 12 hours, numbered 1 through 12. It's commonly used in everyday life in the United States and elsewhere.
The 12-hour clock is a timekeeping system that divides the day into two 12-hour periods: AM (ante meridiem, before noon) and PM (post meridiem, after noon). It is commonly used in the U.S. and contrasts with the 24-hour clock used in many other countries.
