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Tong Shu Calendar Reference

Auspicious Contract Signing Dates for May 2028簽約 · May 2028

By Master Sean Chan · Updated

This month carries Li Xia (立夏) — start of the BaZi summer on May 5 (Singapore time): the BaZi calendar's sectional boundary for the month. Mid-month transition into the BaZi summer; element balance shifts noticeably across the term.Below is the universal Chinese metaphysics ranking of every day in May 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 May
26
pass hard requirements
5
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12028-05-13辛丑成 Completing亢未 (Goat)上吉
22028-05-22庚戌執 Holding虛辰 (Dragon)上吉
32028-05-25癸丑成 Completing壁未 (Goat)上吉
42028-05-27乙卯開 Opening婁酉 (Rooster)上吉
52028-05-09丁酉定 Stabilising張卯 (Rabbit)上吉

All days in May 2028

DateDay PillarOfficerMansion ClashNotable factorsClass
2028-05-01己丑收昴未 Goat建除 收吉
2028-05-02庚寅開畢申 MonkeyFailed requirement: not_year_break大凶
2028-05-03辛卯閉觜酉 Rooster建除 閉平
2028-05-04壬辰閉參戌 Dog四絕 · 建除 閉 · 黃道凶
2028-05-05癸巳建井亥 Pig建除 建 · 宿 井平
2028-05-06甲午除鬼子 Rat建除 除 · 黃道平
2028-05-07乙未滿柳丑 Ox月德合 · 黃道吉
2028-05-08丙申平星寅 Tiger天德合 · 建除 平吉
2028-05-09丁酉定張卯 Rabbit建除 定 · 宿 張上吉
2028-05-10戊戌執翼辰 Dragon建除 執 · 黃道吉
2028-05-11己亥破軫巳 SnakeFailed requirement: not_month_break大凶
2028-05-12庚子危角午 Horse月德 · 建除 危吉
2028-05-13辛丑成亢未 Goat天德 · 建除 成 · 宿 亢上吉
2028-05-14壬寅收氐申 MonkeyFailed requirement: not_year_break大凶
2028-05-15癸卯開房酉 Rooster建除 開吉
2028-05-16甲辰閉心戌 Dog建除 閉 · 黃道平
2028-05-17乙巳建尾亥 Pig月德合 · 建除 建吉
2028-05-18丙午除箕子 Rat天德合 · 建除 除 · 宿 箕吉
2028-05-19丁未滿斗丑 Ox宿 斗 · 黃道吉
2028-05-20戊申平牛寅 Tiger建除 平平
2028-05-21己酉定女卯 Rabbit建除 定吉
2028-05-22庚戌執虛辰 Dragon月德 · 建除 執 · 黃道上吉
2028-05-23辛亥破危巳 SnakeFailed requirement: not_month_break大凶
2028-05-24壬子危室午 Horse建除 危平
2028-05-25癸丑成壁未 Goat建除 成 · 宿 壁 · 黃道上吉
2028-05-26甲寅收奎申 MonkeyFailed requirement: not_year_break大凶
2028-05-27乙卯開婁酉 Rooster月德合 · 建除 開上吉
2028-05-28丙辰閉胃戌 Dog天德合 · 建除 閉 · 黃道吉
2028-05-29丁巳建昴亥 Pig建除 建平
2028-05-30戊午除畢子 Rat建除 除 · 黃道平
2028-05-31己未滿觜丑 Ox黃道吉
Personalised next step

BaZi-Aligned Date Report — May 2028

USD 388

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