Why can't you tell others your birthday easily?

Birthday is related to the fate of your life. It is useless for ordinary people to know it, but people who know the yin and yang and the five elements are different, especially if someone deliberately harms you. That is terrible. It is best not to let people know it casually. When telling someone your birthday, don't tell him the date of birth, otherwise the date of birth is not much different from others, and you can infer it casually. Remember! ! ! !