People born in the Zi hour are said to have two fates because the Zi hour is the time when one day transitions to the next. Those born in the early part of the Zi hour are positive, hardworking, and strive for freedom, optimistic and straightforward, and are inspiring individuals. They enjoy making changes, and even if they have the help of a benefactor, they may not necessarily accept it. People born in the later part of the Zi hour represent death and rebirth, meaning that they return to life at this moment. Those born during this time have strong vitality and are small but indomitable fighters. However, this ability is usually hidden. It only emerges in the most critical moments when they are forced into desperate situations by their environment or others.

In traditional culture, especially in the culture of the Book of Changes, the importance of time is emphasized in feng shui, hexagrams, birth charts, and qimen. Therefore, whether the Zi hour is classified as the time of today or the next day depends on many folk calendars. As the ancients said: "The Zi hour has always been the time of transition." Therefore, if someone's birth time is after 11 p.m., the time of the next day should be used as the basis for fortune-telling. For example, if you were born at 11 p.m. on the 20th, when calculating your birth chart, you should use the date of the 21st instead of the date of the 20th.