Universal time is measured by astrometry, but due to various factors, there will be slight errors compared with atomic time. In order to coordinate universal time and atomic time, scientists are dealing with coordinated universal time.

Coordinate the data of atomic time for the numbers below second of time in the world. When the difference between universal time and atomic time reaches one second, there will be a second jump or negative second jump. The specific procedures are as follows:

When the world time is slow, let UTC increase by one second. 23: 59: 59-23: 59: 60-00: 00.

When the world time is fast, let UTC decrease by one second. 23: 59: 58-00: 00.

"Time" originally has no time. Material movement takes time, but if we don't divide time into spaces, our thinking can't recognize time.

The reason why we can think is that thinking can name the material world, and things are real, thinking is empty, and thinking about life and things is used for thinking. The undivided "time" can't be named and distinguished. Only when it is divided into "time" can it be used by thinking, because it can be named after division.