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Tong Shu Calendar Reference

Auspicious Contract Signing Dates for October 2026簽約 · October 2026

By Master Sean Chan · Updated

This month carries Han Lu (寒露) — month flips to 戌 on October 8 (Singapore time): the BaZi calendar's sectional boundary for the month. Below is the universal Chinese metaphysics ranking of every day in October 2026 for signing a contract (立券 / 交易), derived from the classical Tong Shu (通書). Contracts are agreements meant to hold — the rules favour 定 (Stabilising), 成 (Completing), and 執 (Holding) officers.

Top-ranked dates this month

31
days in October
25
pass hard requirements
5
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12026-10-16丙寅Stabilising申 (Monkey)上吉
22026-10-21辛未Gathering丑 (Ox)上吉
32026-10-28戊寅Stabilising申 (Monkey)上吉
42026-10-07丁巳Completing亥 (Pig)上吉
52026-10-20庚午Completing子 (Rat)上吉

All days in October 2026

DateDay PillarOfficerMansion ClashNotable factorsClass
2026-10-01辛亥滿巳 Snake宿 軫
2026-10-02壬子午 HorseFailed requirement: not_year_break大凶
2026-10-03癸丑未 Goat建除 定 · 宿 亢
2026-10-04甲寅申 Monkey建除 執 · 宿 氐 · 黃道
2026-10-05乙卯酉 RoosterFailed requirement: not_month_break大凶
2026-10-06丙辰戌 Dog建除 危
2026-10-07丁巳亥 Pig建除 成上吉
2026-10-08戊午子 Rat建除 成 · 宿 箕
2026-10-09己未丑 Ox建除 收 · 宿 斗
2026-10-10庚申寅 Tiger建除 開 · 黃道
2026-10-11辛酉卯 Rabbit天德合 · 月德合 · 建除 閉
2026-10-12壬戌辰 Dragon建除 建
2026-10-13癸亥巳 Snake建除 除 · 宿 危 · 黃道
2026-10-14甲子滿午 HorseFailed requirement: not_year_break大凶
2026-10-15乙丑未 Goat建除 平 · 宿 壁
2026-10-16丙寅申 Monkey天德 · 月德 · 建除 定上吉
2026-10-17丁卯酉 Rooster建除 執
2026-10-18戊辰戌 DogFailed requirement: not_month_break大凶
2026-10-19己巳亥 Pig建除 危 · 黃道
2026-10-20庚午子 Rat建除 成上吉
2026-10-21辛未丑 Ox天德合 · 月德合 · 建除 收上吉
2026-10-22壬申寅 Tiger建除 開 · 黃道
2026-10-23癸酉卯 Rabbit建除 閉 · 宿 井 · 黃道
2026-10-24甲戌辰 Dragon建除 建
2026-10-25乙亥巳 Snake建除 除 · 黃道
2026-10-26丙子滿午 HorseFailed requirement: not_year_break大凶
2026-10-27丁丑未 Goat建除 平 · 宿 張
2026-10-28戊寅申 Monkey建除 定 · 黃道上吉
2026-10-29己卯酉 Rooster建除 執 · 宿 軫
2026-10-30庚辰戌 DogFailed requirement: not_month_break大凶
2026-10-31辛巳亥 Pig天德合 · 月德合 · 建除 危
Personalised next step

BaZi-Aligned Date Report — October 2026

USD 388

A personalised PDF that re-ranks every contract signing-suitable day in October 2026 against your BaZi (and, for weddings/ROM, your partner’s BaZi). It surfaces:

Order the report →

See the full glossary of classical date-selection terms in the BaZi Glossary & Auxiliary Stars.

Further reading from the blog

Selected posts from Master Sean Chan's blog covering this topic and closely related ones in practice:

Frequently asked

Why isn’t my day on the list of top 5?

The top list is the universal ranking before any personal adjustment. Many couples find their best date isn’t in the top 5. Once you account for your day pillars, the right day often shifts. That’s exactly the gap the BaZi-Aligned Date Report fills.

What does 大凶 mean and can it ever be overridden?

大凶 means the day fails a hard classical requirement: 月破 (month break), 歲破 (year break), or 四離/四絕 (a quarter-day boundary). These cannot be overridden by personal alignment; they are excluded categorically. Choose another day.

Why don’t you show times here?

Hour selection is personal. The right hour depends on your day pillar and the chosen day’s element relationship to it. Publishing universal “auspicious hours” misleads readers into thinking a generic hour is safe; it isn’t. Hours are included in the personalised report.

Where do these scores come from?

The classical Tong Shu (通書) tradition: 建除十二神 (Twelve Officers), 二十八宿 (Twenty-Eight Mansions), 月德 / 天德 (monthly and yearly virtue stars), 黃黑道 (Yellow/Black Dao), and the Dong Gong (董公) per-purpose rules. We compute these directly from astronomical solar terms — no app shortcuts.

If a contract is signed on a 大凶 day, is the contract void?

Legally no — the document is binding regardless. Energetically the method holds that the agreement carries the day’s deficits (month break weakens its longevity; year break invites reversal). Choose another day if at all possible; if you can’t, the personalised report identifies the least-bad alternative.

Methodology

Pillars use the 60 Jiazi day cycle anchored to the published Tong Shu. The BaZi year flips at Li Chun, the BaZi month flips at each sectional solar term — both computed from VSOP87 ephemeris data. The Twelve Officers (建除) and the 28 Mansions each have their own deterministic rotation against an authoritative anchor.

Weights come from the Dong Gong (董公擇日) school. Auspicious 神煞 add, taboo 神煞 subtract, the officer and mansion adjust, Yellow Dao adds a small bonus on top. Sum, clamp to 0–100, classify. No app shortcuts.