2. The timing method of 12 hour uses "early morning", "morning" and "morning" to describe the time from 0: 00 to 12 noon, and uses "afternoon", "evening" and "night" to describe the time from12 noon to 65438 night.
24-hour timing is the most commonly used timing method. Radio stations, stations, post offices and other departments use the 24-hour timing method from 0: 00 to 24: 00. According to this timing method, at 1 in the afternoon, it is 13: 00, at 2 pm, it is 14: 00 ... at night, it is 24: 00.
At midnight, 12 hour is the beginning of the day, and the 24 hours of 1 day are divided into two sections, each of which is 12 hour. From 12 midnight to 12 noon is called the morning, and from 12 noon to 12 midnight is called the afternoon. This timing method is often used in life.
Extended data:
Ancient twelve-hour timing system
The ancient working people divided a day and night into twelve periods, and each period was called an hour. Twelve o'clock can refer to either a day or any time. Twelve o'clock was created by the ancient working people in China according to the natural laws of the sun, the changes of the sky and their daily production activities and living habits.
This is the twelve-hour system used in the Western Zhou Dynasty. In the Han Dynasty, it was named Midnight, Crow, Pingdan, Sunrise, Food Time, Horn, Japan-China, Sundial, Sunset, Dusk and Man's Decision. It is also expressed by the twelve earthly branches, and it is the child time from 23: 00 to 1 at midnight, the ugly time from 1 to 3: 00, and the Yin Shi time from 3: 00 to 5: 00, which are recursive in turn.