Case 19 of 26
Unknown birth time
Unknown time: leap-day adult stays three-pillar
A leap-day date is reproducible without pretending that noon was supplied by the user.
Boundary question
What does the public contract show when the birth time is unknown?
Only Bing-Zi, Geng-Yin, and Bing-Shen (丙子 庚寅 丙申) are public. Hour, exact correction, and exact Luck Pillar timing are withheld.
Synthetic input
Recorded facts
- Date
- 1996-02-29
- Recorded time
- Unknown
- Location
- Singapore
- Time zone
- Asia/Singapore
- Longitude
- 103.8198°
- Gender input
- Male
The engine uses an internal noon placeholder to obtain a date-level reference. That placeholder is deliberately not presented as a recorded birth time.
Pinned expected facts
Verified output
Year
丙子
Month
庚寅
Day
丙申
Hour
?
- Day Master
- Reference only: 丙
- True solar time
- Withheld — birth time unknown
- Total correction
- Withheld — birth time unknown
- Historical offset
- Withheld — birth time unknown
- Luck direction
- Withheld — birth time unknown
- Reference Jie
- Withheld — birth time unknown
- Luck start
- Withheld — birth time unknown
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.
With an unknown time, even the displayed date-level reference can require review near a true-solar day or solar-term boundary. No Hour Pillar or exact Luck Pillar start should be inferred from this page.
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