12 Day Officers (建除十二神): The Definitive Guide
This is the professional standard for using the 12 Day Officers to time moves in business and relationships—fast, precise, and actionable.
What the 12 Day Officers Are (30 seconds)
The 12 Day Officers are a repeating sequence—建 除 满 平 定 执 破 危 成 收 开 闭—assigned to each calendar day. They’re determined by comparing the day’s Earthly Branch (日支) with the month’s Branch (月建) defined by the solar terms (not lunar months).
Use-case: pick the right day for the right action. You don’t force outcomes—you align timing to tilt odds and leverage.
The Only Rule That Matters
Officer = ( dayBranchIndex − monthBranchIndex ) mod 12
- Month Branch (月建): taken from solar months (Sun’s ecliptic longitude λ⊙ by principal terms). 寅起: 寅→丑 in 30° segments.
- Day Branch (日支): from the 60-day sexagenary cycle (Zi-hour day start optional).
- Mapping: when dayBranch = monthBranch, the Officer is 建 (Establish). Then follow the fixed order: 建→除→满→平→定→执→破→危→成→收→开→闭.
Solar Month vs Lunar Month (Why Pros Use Solar)
Month boundaries for Officers are set by the Sun, not the lunar month. That avoids leap-month ambiguity and aligns with classical择日 practice. Practically: fewer arguments, better reproducibility, tighter control at boundaries.
The 12 Officers — Meaning & Moves
| Officer | Plain English | Business Plays | Relationship Plays | Avoid |
|---|---|---|---|---|
| 建 | Establish | First contact, filings, kickoffs, claim names/handles. | Light outreach, apology seed, set expectations. | Irreversible commitments (save for 定 / 成). |
| 除 | Remove | Cost cuts, clean data, kill bad projects, unsubscribe. | End stale fights, detox routines, declutter shared space. | New launches. |
| 满 | Full | Collect benefits owed, loyalty redemptions, finalize payouts. | Celebrate small wins; wrap loose ends. | New initiatives; momentum is consolidating, not starting. |
| 平 | Level | Normalize terms, renegotiate parity, maintenance sprints. | Reset routines, agree “no drama” rules. | High-stakes gambits. |
| 定 | Settle | Lock pricing, sign contracts, finalize specs. | Make concrete commitments; define timelines. | Open-ended explorations. |
| 执 | Hold | Enforce SOPs, compliance pushes, roll out playbooks. | Hold boundaries; follow through. | Soft, ambiguous asks. |
| 破 | Break | Terminate vendors, restructure, litigate, hard reset. | Sharp confrontations when needed; cut toxic loops. | Fragile alliances you still need. |
| 危 | Danger | Run red-team reviews, stress tests, fail-safes. | Discuss risks calmly; avoid ultimatums. | Big launches; error tolerance is low. |
| 成 | Success | Ship, publish results, showcase case studies. | Celebrate, reveal outcomes, make it public. | Long negotiations (do them earlier on 定 / 平). |
| 收 | Receive | Invoices, collections, AR calls, reconciliations. | Ask for returns/favors; finalize exchanges. | Bold new bets (use 开 / 成). |
| 开 | Open | Announcements, PR bursts, hiring kickoff. | Introduce ideas, invite collaboration. | Closures; keep doors open. |
| 闭 | Close | Shut down, archive, audit, seal terms. | Close chapters cleanly; document boundaries. | Starts; this is for endings and containment. |
“Why do two identical Officers appear back-to-back?”
At a solar-month boundary, both the day Branch and month Branch advance by one. The difference—(day − month) mod 12—stays the same. Result: two identical Officers in a row. It’s correct.
Use It in 10 Seconds
- Open the calculator: /12-day-officers/
- Toggle Zi-hour if you work with 23:00 day start.
- Act by the Officer’s edge (table above). If stakes are high, stack with your Day Pillar and season.
Stacking Signals (when you need extra edge)
- Officer + Day Pillar (干支): match action style to pillar temperament (e.g., metal day = crisp decisions).
- Officer + Season (solar terms): use seasonal bias for tone—Open in growth seasons, Close in dormancy.
Quick FAQ
Do you use Zi-hour day start?
Supported. Turn it on if your practice changes the day at 23:00 local.
Why solar months?
They’re defined by the Sun’s actual position—clean boundaries, no leap-month ambiguity.
How precise is this?
Astronomical λ⊙ for month branch; sexagenary day for day branch; small calibration to align with your chosen almanac.
