Birthday occupies an important position in Chinese traditional folk culture, and the exploration of the five elements of birth is also a necessary subject of human biological rhythm.

The problem is that many people are not sure about their original birth time or can't remember it clearly. At other times, the state implements daylight saving time and deliberately moves the time forward 1 hour. This also needs to be adjusted first, and then it will be adjusted to the apparent solar time according to different regions. It is not easy to operate in practice. No wonder the eight-character fortune teller often has inaccurate time. After so many time adjustments, the original time has become another time, and the whole eight-character pattern may have earth-shaking changes.