BaZi Chart

Birthplace determines the time zone, historical daylight saving time, and true solar time — it is not optional.

Birth Time (Local Clock Time)

Enter the time as shown on your birth certificate. If daylight saving time was in effect, the system will automatically adjust for it — do not subtract an hour yourself.

Year Month Day Hour Minute

Gender

Used only to determine the forward/reverse sequence of Major Luck Cycles, not affecting the Four Pillars. A chart can be cast without it, but it will lack Major Luck Cycles.

Not specified Male Female

Birthplace

Determines time zone and longitude. ⚠️ Many cities share the same name (the database has 6 San Franciscos, 2 Londons). Please confirm by time zone.

Common Cities

Calculation Options True Solar Time Correction Uses birthplace longitude and the equation of time to shift the clock so that solar noon falls exactly at the midpoint of the Wu (Horse) hour. Practices vary by school; this site does not enable it by default. Zi Hour (23:00–01:00) Day Assignment Only affects the Day Pillar for those born between 23:00 and 23:59.