How to calculate the time in the birth date?

The so-called eight characters refer to the eight characters formed by heavenly stems and earthly branches in the year, month, day and time, which are collectively called eight characters. In ancient China, heavenly stems and earthly branches was used to mark time. For example, 2005 is the year of Yiyou (called the Year of the Rooster because Yiyou is the rooster in the zodiac, and also called the Year of the Rooster because B is the tree in the five elements). Another example is the time, which we often say is "Midnight", "Noon", "Hishiya spear", "Sunset especially" and "Evening is relaxing". The "Zi" and "Wu Shi" here are the earthly branches of the trunk of time, and they all match the heavenly stems according to certain laws. The month and the day are also combined with heavenly stems and earthly branches. If you open the calendar, you can clearly see that every month and every day are different words.