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Tong Shu Calendar Reference

Auspicious Contract Signing Dates for December 2028簽約 · December 2028

By Master Sean Chan · Updated

This month carries Da Xue (大雪) — month flips to 子 on December 6 (Singapore time): the BaZi calendar's sectional boundary for the month. Winter solstice (冬至) lands within this month — the year's lowest Yang point, commonly avoided for major ceremonial events.Below is the universal Chinese metaphysics ranking of every day in December 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

31
days in December
26
pass hard requirements
4
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12028-12-10壬申成 Completing胃寅 (Tiger)上吉
22028-12-30壬辰定 Stabilising牛戌 (Dog)上吉
32028-12-03乙丑滿 Filling女未 (Goat)上吉
42028-12-22甲申成 Completing角寅 (Tiger)上吉
52028-12-06戊辰定 Stabilising室戌 (Dog)吉

All days in December 2028

DateDay PillarOfficerMansion ClashNotable factorsClass
2028-12-01癸亥建斗巳 Snake建除 建 · 宿 斗 · 黃道吉
2028-12-02甲子除牛午 Horse月德 · 建除 除吉
2028-12-03乙丑滿女未 Goat天德 · 黃道上吉
2028-12-04丙寅平虛申 MonkeyFailed requirement: not_year_break大凶
2028-12-05丁卯定危酉 Rooster建除 定 · 宿 危吉
2028-12-06戊辰定室戌 Dog建除 定吉
2028-12-07己巳執壁亥 Pig建除 執 · 宿 壁吉
2028-12-08庚午破奎子 RatFailed requirement: not_month_break大凶
2028-12-09辛未危婁丑 Ox建除 危平
2028-12-10壬申成胃寅 Tiger月德 · 建除 成 · 黃道上吉
2028-12-11癸酉收昴卯 Rabbit建除 收 · 黃道吉
2028-12-12甲戌開畢辰 Dragon建除 開吉
2028-12-13乙亥閉觜巳 Snake建除 閉平
2028-12-14丙子建參午 Horse建除 建 · 黃道平
2028-12-15丁丑除井未 Goat月德合 · 建除 除 · 宿 井吉
2028-12-16戊寅滿鬼申 MonkeyFailed requirement: not_year_break大凶
2028-12-17己卯平柳酉 Rooster建除 平 · 黃道平
2028-12-18庚辰定星戌 Dog建除 定吉
2028-12-19辛巳執張亥 Pig建除 執 · 宿 張吉
2028-12-20壬午破翼子 RatFailed requirement: not_month_break大凶
2028-12-21癸未危軫丑 Ox建除 危 · 宿 軫平
2028-12-22甲申成角寅 Tiger建除 成 · 黃道上吉
2028-12-23乙酉收亢卯 Rabbit建除 收 · 宿 亢 · 黃道吉
2028-12-24丙戌開氐辰 Dragon建除 開 · 宿 氐吉
2028-12-25丁亥閉房巳 Snake月德合 · 建除 閉平
2028-12-26戊子建心午 Horse建除 建 · 黃道平
2028-12-27己丑除尾未 Goat建除 除 · 黃道平
2028-12-28庚寅滿箕申 MonkeyFailed requirement: not_year_break大凶
2028-12-29辛卯平斗酉 Rooster建除 平 · 宿 斗 · 黃道吉
2028-12-30壬辰定牛戌 Dog月德 · 建除 定上吉
2028-12-31癸巳執女亥 Pig建除 執吉
Personalised next step

BaZi-Aligned Date Report — December 2028

USD 388

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

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.