BaZi Day Master Calculator
What is my Day Master? Start with the Heavenly Stem of your birth day. No account or email is needed.
Your date and optional time are sent to the server for this calculation. This tool does not create a saved reading or send the inputs to an AI model. See the privacy policy for site-wide data practices. Privacy Policy
How to check your result
Is my Day Master the same as my zodiac animal?
No. Your Day Master is the Heavenly Stem of the Day Pillar. A Chinese zodiac animal comes from the Year Branch. People born in the same zodiac year can have different Day Masters.
Why do two Day Master calculators disagree?
Check the same Gregorian date first, then the clock time, birthplace, solar-time correction and day rollover rule. This preview keeps 23:xx on the recorded date and changes the day at midnight. Other schools may use 23:00.
Can I use the calculator without my birth time?
Yes, as a provisional date-only result. Noon is a disclosed reference, not your assumed actual birth time. A missing time limits boundary checks and a complete chart reading.
Does Jia Wood tell me which element is lucky?
No. A day stem identifies one reference point in the chart. Traditional strength and useful-element analysis needs the other pillars and a stated method; it is not a guarantee of personality or future events.
Can I save the calculation settings without creating an account?
Yes. After calculating, download a text receipt with the entered date, known or unknown time, day stem, day pillar, rollover rule and correction limits. A late-Zi comparison is included when a known time is 23:xx. The receipt is a local download, not a saved account reading.
Two reproducible examples
These fictional inputs illustrate the calculation convention. They are not personal readings. Enter the same values to check the result.
- 1990-06-08 · time blank → Jia (甲), 甲辰; disclosed noon reference, no Hour Pillar.
- 1990-06-08 · 23:30 → 甲辰 with midnight rollover; 乙巳 with the 23:00 comparison. The input date is unchanged.