BaZi Calculator

Calculate Year/Month/Day/Hour pillars with a single reference point.

Quick Start

1. 1. Use references/reference-verified.json (or your own verified reference JSON) with one trusted reference datetime and its four pillars.
2. Run:

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1. 3. Return results left-to-right as:

• - Hour pillar
• Day pillar
• Month pillar
• Year pillar
• Eight characters (Hour Day Month Year)

Workflow

1) Validate inputs

• - Require birth datetime (YYYY-MM-DD HH:MM).
• Require timezone (default Asia/Shanghai if omitted).
• Require one reference JSON with:

2) Compute offsets from reference

• - Year offset: LiChun-adjusted year difference (approximation: Feb-04 00:00 local).
• Month offset: calendar month difference.
• Day offset: calendar day difference.
• Hour offset: 2-hour bin difference (Zi starts at 23:00).

3) Shift each base pillar in 60-cycle

• - target_pillar = shift(reference_pillar, offset mod 60) for year/month/day/hour separately.

4) Present output

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Notes

• - This is a deterministic reference-based method.
• Accuracy depends on correctness of the chosen reference and boundary rules.
• For professional-grade astrology, validate solar-term boundaries and true solar time adjustments.