Case 05 of 26
Solar-term boundaries
Before Qingming: Gregorian April is still Mao month
April 4 remains on the pre-Qingming side of the month boundary.
Boundary question
Can an April record still have the Mao Month Pillar?
Yes. The Month Pillar remains Xin-Mao (辛卯) until Qingming arrives.
Synthetic input
Recorded facts
- Date
- 2026-04-04
- Recorded time
- 12:00
- Location
- 120°E reference meridian
- Time zone
- Asia/Shanghai
- Longitude
- 120.0000°
- Gender input
- Female
Pinned expected facts
Verified output
Year
丙午
Month
辛卯
Day
戊申
Hour
戊午
- Day Master
- 戊
- True solar time
- 2026-04-04 11:56
- Total correction
- -3.44 minutes
- Historical offset
- UTC+08:00 · DST 0 min
- Luck direction
- 逆排
- Reference Jie
- 惊蛰 · 2026-03-05 21:59:00
- Luck start
- 2036-02-14 07:02:33
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