How is birthdays recognized?

How to mass produce? First of all, we must arrange the correct eight characters. How to arrange the correct eight characters? This requires us to know how to distinguish the twelve months of each year. There are always 24 solar terms throughout the year. There is a festival every month. The difference between months is based on the festivals of each month. Last month was before the festival, and this month is after the festival. Take the ninth day of the first month of the 20 16 lunar calendar as an example. 20 16 is the fourth supplement of beginning of spring in the first lunar month. The boy you provided was born after 20 16 in beginning of spring. Therefore, if he ranks eighth, he is even born on 20 16. Its eight characters are: (year) Bing Shen, (month) Geng Yin, (day) Chen Wu and (time) Gui Hai. The eight characters above you are wrong. So if this boy was born before the fourth day of the first month of 20 16. For example, if he was born in the third grade, his horoscope will be arranged according to last year's twelfth lunar month 20 15. His eight characters are (year) B Wei, (month) Ugly, (day) B Mao, (time) Ding Hai. After the correct horoscope is discharged, the horoscope can be calculated according to the happy E Lai of that day. I hope my answer is helpful to you.