Your Day Pillar — the one that defines who you actually are — needs your exact birthday.
BaZi (八字) literally means "eight characters." Your birth chart uses eight Chinese characters — two for each of the four pillars: year, month, day, and hour. Each pair is a Heavenly Stem and an Earthly Branch. Together, these eight characters map who you are.
Start with your year below. It's the broadest pillar — what you share with your entire generation. Each step gets more personal.