Day Pillar

Chinese BaZi charts you can audit

A free Four Pillars calculator that shows its own working — historical time zone, longitude, and the equation of time — so you can check the result instead of trusting it.

Cast a chartRead the conventions

Worked example — born 4 February 2024, 03:30, New York

This birth sits minutes past Li Chun once you account for the time zone, so the year pillar advances. A calculator that corrects the clock to true solar time and then compares that reading against the solar-term table returns 癸卯 — wrong by a whole year. Why.

Year
甲
辰
Month
丙
寅
Day
戊
戌
Hour
甲
寅

How this hour was derived

Most calculators apply the longitude step and stop. The equation of time is the one that moves charts near a two-hour boundary.

  1. 1Clock time as recorded2024-02-04 03:30America/New_York
  2. 2Historical UTC offsetUTC−5reference meridian -75.0°
  3. 3Longitude correction+4.00 min-74.00° is 1.00° from the zone meridian, at 4 min per degree
  4. 4Equation of time−13.86 minthe difference between the real sun and an even-paced fictional one on this date
  5. 5Total correction−9.86 min
  6. 6True solar time2024-02-04 03:20:08
  7. 7Hour branch寅read from true solar time, not from the clock