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Tong Shu Calendar Reference

Auspicious ROM Dates for May 2028註冊結婚 · 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 civil registration of marriage (ROM in Singapore), derived from the classical Tong Shu (通書). ROM uses a tighter rule set than a full ceremonial wedding — registration is a single act that benefits from 開 (Opening) and 成 (Completing) days and avoids 閉 (Closing) days more strictly than a full banquet.

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
22028-05-27乙卯開 Opening婁酉 (Rooster)上吉
32028-05-22庚戌執 Holding虛辰 (Dragon)上吉
42028-05-25癸丑成 Completing壁未 (Goat)上吉
52028-05-18丙午除 Removing箕子 (Rat)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 · 黃道大凶
2028-05-05癸巳建井亥 Pig建除 建 · 宿 井吉
2028-05-06甲午除鬼子 Rat黃道吉
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 張吉
2028-05-10戊戌執翼辰 Dragon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 · 宿 房吉
2028-05-16甲辰閉心戌 Dog建除 閉 · 宿 心 · 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 · 黃道上吉
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 · 宿 女吉
2028-05-22庚戌執虛辰 Dragon月德 · 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 · 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黃道吉
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 ROM / civil registration-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.

Does the timing of ROM matter as much as a wedding ceremony?

Energetically yes — the registration is the legal-binding moment, and the day-pillar element it sits on travels with the marriage record. Practically the rule set is slightly looser than a full banquet (no need for 喜慶 stars), but month-break and year-break disqualifiers still apply absolutely.

Methodology

Each day’s pillar is computed from the 60 Jiazi rotation anchored against the published Tong Shu, not from any single calendar app. The BaZi year flips at Li Chun (立春) and the BaZi month flips at every sectional solar term, both calculated from VSOP87 solar-longitude data so the boundaries land on the right minute. Twelve Officers and the 28 Mansions each rotate deterministically against well-known anchors.

The per-purpose weights are Dong Gong’s (董公擇日) — adjusted where modern almanacs disagree, in favour of the Hong Kong Observatory and Taiwan CWB lineage. Auspicious stars add to the score, taboo stars subtract, the day’s officer and mansion shift it further, and Yellow Dao adds a final small bonus. The final number gets capped at 100 and mapped to one of five tiers.