This involves the meaning of Bazi, which is to transform a person's "birth year, month and day" into a horoscope composed of "Heavenly Stems and Earthly Branches" according to a specific rule, and that is a horoscope. A horoscope that can analyze a person's future fortune. Because the "total number of stems and branches" in this birth chart is exactly "eight", they are collectively called "horoscopes", or commonly known as "birthday horoscopes". A person's horoscope contains "year stem branch", "month stem branch", "day stem branch" and "hour stem branch", which looks like "four pillars", so "horoscope" is also called "four pillars", and "horoscope" is also called "four pillars". "On Fate" can also be called "Four Pillars of Destiny".
Therefore, if you have the year, month, day and time, you will not lack anything.