BaZi Day Master
What Is a Day Master in BaZi?
In BaZi, the Day Master is one of the Ten Heavenly Stems. Each BaZi Day Master combines one of the Five Elements — Wood, Fire, Earth, Metal, or Water — with either Yin or Yang polarity, creating ten possible Day Master types.
BaZi Day Master Calculator
How Is Your Day Master Determined?
The Day Master is the Heavenly Stem of the Day Pillar. In a Four Pillars chart, look at the Day column and take the top character.
Here is a sample chart based on the current time (2026-09-30 06:58). The Heavenly Stem labeled Day Master in the Day Pillar is Ding Fire in this example.
Year Pillar
Heavenly Stem
Bing Fire
Month Pillar
Heavenly Stem
Ding Fire
Day Pillar
Heavenly Stem
Ding Fire
Day Master
Hour Pillar
Heavenly Stem
Gui Water
Why Is the Day Master Important in BaZi?
The Day Master is important because it serves as the central reference point for interpreting a BaZi chart. It represents the self and is used to determine the Ten Gods, assess Day Master strength, and understand how the other elements relate to the person.
It represents the self
The Day Master serves as the reference point of the chart. Its relationships with the other stems and branches show how the self interacts with different people, situations, and influences.
It determines the Ten Gods
The Ten Gods are defined by how the other elements relate to the Day Master. For example, for a Yi Wood Day Master, Ren Water is Direct Resource and Ding Fire is Eating God.
It helps interpret the whole chart
The Day Master is only the starting point. Its meaning changes depending on season, strength, Ten Gods, and the relationships among the stems and branches.
What Is a Strong or Weak Day Master?
A strong Day Master has enough support from the rest of the BaZi chart, while a weak Day Master receives less support and is more affected by elements that drain, control, or weaken it. This is mainly judged from the birth month, roots in the Earthly Branches, and support from other elements.
Strong and weak describe the Day Master’s relative condition within the chart, not whether a person is stronger, healthier, or more capable. Neither is automatically better; the meaning depends on how the whole chart is balanced.
Learn how to assess Day Master strength →Frequently Asked Questions
Do I need my birth time to find my Day Master?
No. Your birth date is enough to find your Day Master in most cases. If you were born near the change-of-day boundary, your exact birth time and location may affect the result.
What’s the difference between a Day Master, Day Pillar, and Chinese Zodiac?
The Day Master is the Heavenly Stem of your Day Pillar and represents the “self” in BaZi. The Day Pillar includes both the Heavenly Stem and Earthly Branch of your birth day, while the Chinese Zodiac is usually based on the Earthly Branch of your Year Pillar.
Do people with the same Day Master have the same personality?
No. The Day Master is only one part of a BaZi chart, so people with the same Day Master can still have very different traits and experiences.
Explore Your Full BaZi Chart
Your Day Master is only one part of your BaZi chart. Generate your full chart to see your Ten Gods, Five Elements, and how your Day Master fits into the whole chart.
Sources and Classical References
This page references the following classical texts; excerpts retain the original Chinese wording.
Wu Xing Da Yi, Volume 2 · Stems and Branches · Source: Wikisource
Original text
干則甲丙戊庚壬為陽，乙丁己辛癸為陰。
San Ming Tong Hui, Volume 2 · Year, Month, Day, and Hour · Source: Wikisource
Original text
凡論人命，年月日時排成四柱……遁時從日，則以日為主。
San Ming Tong Hui, Volume 5 · Names of the Ten Gods · Source: Wikisource
Original text
今指甲乙為例，以日干論甲乙，在五行屬木，甲陽而乙陰也。
Di Tian Sui · Decline and Strength · Source: Wikisource
Original text
旺則宜洩宜傷，衰則喜幫喜助，然旺中有衰者存，不可損也。