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Tong Shu Calendar Reference

Auspicious ROM Dates for April 2026註冊結婚 · April 2026

By Master Sean Chan · Updated

This month carries Qing Ming (清明) — month flips to 辰 on April 5 (Singapore time): the BaZi calendar's sectional boundary for the month. Below is the universal Chinese metaphysics ranking of every day in April 2026 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

30
days in April
24
pass hard requirements
3
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12026-04-25壬申Stabilising寅 (Tiger)上吉
22026-04-10丁巳Removing亥 (Pig)上吉
32026-04-30丁丑Gathering未 (Goat)上吉
42026-04-07甲寅Opening申 (Monkey)
52026-04-20丁卯Closing酉 (Rooster)

All days in April 2026

DateDay PillarOfficerMansion ClashNotable factorsClass
2026-04-01戊申寅 Tiger
2026-04-02己酉卯 RabbitFailed requirement: not_month_break大凶
2026-04-03庚戌辰 Dragon建除 危
2026-04-04辛亥巳 Snake建除 危 · 黃道
2026-04-05壬子午 HorseFailed requirement: not_year_break大凶
2026-04-06癸丑未 Goat建除 收
2026-04-07甲寅申 Monkey建除 開 · 黃道
2026-04-08乙卯酉 Rooster建除 閉
2026-04-09丙辰戌 Dog建除 建 · 黃道
2026-04-10丁巳亥 Pig天德合 · 月德合 · 宿 井上吉
2026-04-11戊午滿子 Rat
2026-04-12己未丑 Ox建除 平
2026-04-13庚申寅 Tiger建除 定 · 黃道
2026-04-14辛酉卯 Rabbit宿 張 · 黃道
2026-04-15壬戌辰 DragonFailed requirement: not_month_break大凶
2026-04-16癸亥巳 Snake建除 危 · 宿 軫 · 黃道
2026-04-17甲子午 HorseFailed requirement: not_year_break大凶
2026-04-18乙丑未 Goat建除 收 · 宿 亢
2026-04-19丙寅申 Monkey建除 開 · 宿 氐 · 黃道
2026-04-20丁卯酉 Rooster天德合 · 月德合 · 建除 閉
2026-04-21戊辰戌 Dog建除 建 · 宿 心 · 黃道
2026-04-22己巳亥 Pig黃道
2026-04-23庚午滿子 Rat
2026-04-24辛未丑 Ox建除 平 · 宿 斗
2026-04-25壬申寅 Tiger天德 · 月德 · 建除 定上吉
2026-04-26癸酉卯 Rabbit宿 女 · 黃道
2026-04-27甲戌辰 DragonFailed requirement: not_month_break大凶
2026-04-28乙亥巳 Snake建除 危 · 宿 危 · 黃道
2026-04-29丙子午 HorseFailed requirement: not_year_break大凶
2026-04-30丁丑未 Goat天德合 · 月德合 · 建除 收上吉
Personalised next step

BaZi-Aligned Date Report — April 2026

USD 388

A personalised PDF that re-ranks every ROM / civil registration-suitable day in April 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.

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.