Case 03 of 26
Solar-term boundaries
Before Jingzhe: the Yin month remains
March 4 is still inside the solar month that began at Lichun.
Boundary question
Does the Month Pillar change merely because the Gregorian month says March?
No. Before Jingzhe, the Month Pillar remains Geng-Yin (庚寅).
Synthetic input
Recorded facts
- Date
- 2026-03-04
- Recorded time
- 12:00
- Location
- 120°E reference meridian
- Time zone
- Asia/Shanghai
- Longitude
- 120.0000°
- Gender input
- Male
Pinned expected facts
Verified output
Year
丙午
Month
庚寅
Day
丁丑
Hour
丙午
- Day Master
- 丁
- True solar time
- 2026-03-04 11:47
- Total correction
- -12.34 minutes
- Historical offset
- UTC+08:00 · DST 0 min
- Luck direction
- 顺排
- Reference Jie
- 惊蛰 · 2026-03-05 21:59:00
- Luck start
- 2026-08-25 10:29:39
Conventions and limits
What this case does — and does not — prove
It verifies
Deterministic reproduction of this input under the named engine version and conventions. A pinned-field mismatch stops the production build.
It does not claim
Universal agreement across Bazi schools, interpretation of a real person, or certainty where the historical record is incomplete.
tyme4ts 1.5.2 · cantian-tymext 0.0.27 · sect 2 day boundary · BaziCalculator.ai NOAA/IANA true-solar adapter
calculation-benchmarks-v1 · reviewed 2026-09-05