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Tong Shu Calendar Reference

Auspicious Contract Signing Dates for September 2028簽約 · September 2028

By Master Sean Chan · Updated

This month carries Bai Lu (白露) — month flips to 酉 on September 7 (Singapore time): the BaZi calendar's sectional boundary for the month. Below is the universal Chinese metaphysics ranking of every day in September 2028 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

30
days in September
26
pass hard requirements
6
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12028-09-01壬辰成 Completing角戌 (Dog)上吉
22028-09-14乙巳成 Completing壁亥 (Pig)上吉
32028-09-26丁巳成 Completing張亥 (Pig)上吉
42028-09-02癸巳收 Gathering亢亥 (Pig)上吉
52028-09-22癸丑定 Stabilising井未 (Goat)上吉

All days in September 2028

DateDay PillarOfficerMansion ClashNotable factorsClass
2028-09-01壬辰成角戌 Dog月德 · 建除 成 · 黃道上吉
2028-09-02癸巳收亢亥 Pig天德 · 建除 收 · 宿 亢上吉
2028-09-03甲午開氐子 Rat建除 開 · 宿 氐吉
2028-09-04乙未閉房丑 Ox建除 閉 · 黃道平
2028-09-05丙申建心寅 Tiger建除 建平
2028-09-06丁酉除尾卯 Rabbit月德合 · 建除 除吉
2028-09-07戊戌除箕辰 Dragon建除 除 · 宿 箕平
2028-09-08己亥滿斗巳 Snake宿 斗吉
2028-09-09庚子平牛午 Horse月德 · 建除 平 · 黃道吉
2028-09-10辛丑定女未 Goat建除 定吉
2028-09-11壬寅執虛申 MonkeyFailed requirement: not_year_break大凶
2028-09-12癸卯破危酉 RoosterFailed requirement: not_month_break大凶
2028-09-13甲辰危室戌 Dog建除 危平
2028-09-14乙巳成壁亥 Pig月德合 · 建除 成 · 宿 壁上吉
2028-09-15丙午收奎子 Rat建除 收 · 宿 奎 · 黃道吉
2028-09-16丁未開婁丑 Ox建除 開 · 黃道吉
2028-09-17戊申閉胃寅 Tiger建除 閉平
2028-09-18己酉建昴卯 Rabbit建除 建 · 黃道平
2028-09-19庚戌除畢辰 Dragon月德 · 建除 除吉
2028-09-20辛亥滿觜巳 Snake—吉
2028-09-21壬子平參午 Horse四離 · 建除 平 · 黃道凶
2028-09-22癸丑定井未 Goat建除 定 · 宿 井上吉
2028-09-23甲寅執鬼申 MonkeyFailed requirement: not_year_break大凶
2028-09-24乙卯破柳酉 RoosterFailed requirement: not_month_break大凶
2028-09-25丙辰危星戌 Dog建除 危平
2028-09-26丁巳成張亥 Pig建除 成 · 宿 張上吉
2028-09-27戊午收翼子 Rat建除 收 · 黃道吉
2028-09-28己未開軫丑 Ox建除 開 · 宿 軫 · 黃道上吉
2028-09-29庚申閉角寅 Tiger月德 · 建除 閉吉
2028-09-30辛酉建亢卯 Rabbit建除 建 · 宿 亢 · 黃道平
Personalised next step

BaZi-Aligned Date Report — September 2028

USD 388

A personalised PDF that re-ranks every contract signing-suitable day in September 2028 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

Day pillars derive from the standard 60 Jiazi anchor (sexagenary day cycle, anchored against the published Tong Shu). Year pillars switch on Li Chun (立春), the first solar term of the BaZi year, computed from the truncated VSOP87 series for solar longitude. Month pillars switch on each sectional solar term. The Twelve Officers are the day branch’s offset from the month branch; the Twenty-Eight Mansions cycle every 28 days against an authoritative anchor.

Per-purpose rules follow the Dong Gong (董公擇日) tradition with adjustments encoded in our open purpose_rules.yaml. Scores are additive over the day’s present 神煞, the officer/mansion preference, and the Yellow Dao bonus, then clamped to 0–100 and classified.