Skip to content
Tong Shu Calendar Reference

Auspicious Business Opening Dates for July 2026開業 · July 2026

By Master Sean Chan · Updated

This month carries Xiao Shu (小暑) — month flips to 未 on July 7 (Singapore time): the BaZi calendar's sectional boundary for the month. Below is the universal Chinese metaphysics ranking of every day in July 2026 for opening a business (開市), derived from the classical Tong Shu (通書). Opening is treated as a 'beginning' — the rules favour 開 (Opening) and 建 (Establishing) officers and Yellow Dao days carrying 天德 / 月德 protection.

Top-ranked dates this month

31
days in July
27
pass hard requirements
6
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12026-07-31己酉滿 Filling井卯 (Rabbit)上吉
22026-07-26甲辰收 Gathering胃戌 (Dog)上吉
32026-07-02庚辰開 Opening參戌 (Dog)上吉
42026-07-15癸巳開 Opening尾亥 (Pig)上吉
52026-07-27乙巳開 Opening昴亥 (Pig)上吉

All days in July 2026

DateDay PillarOfficerMansion ClashNotable factorsClass
2026-07-01己卯收觜酉 Rooster黃道吉
2026-07-02庚辰開參戌 Dog建除 開 · 宿 參上吉
2026-07-03辛巳閉井亥 Pig月德合 · 建除 閉 · 宿 井平
2026-07-04壬午建鬼子 Rat黃道吉
2026-07-05癸未除柳丑 Ox—平
2026-07-06甲申滿星寅 Tiger建除 滿 · 黃道吉
2026-07-07乙酉滿張卯 Rabbit建除 滿 · 宿 張吉
2026-07-08丙戌平翼辰 Dragon建除 平 · 黃道平
2026-07-09丁亥定軫巳 Snake宿 軫 · 黃道吉
2026-07-10戊子執角午 HorseFailed requirement: not_year_break大凶
2026-07-11己丑破亢未 GoatFailed requirement: not_month_break大凶
2026-07-12庚寅危氐申 Monkey建除 危 · 宿 氐 · 黃道凶
2026-07-13辛卯成房酉 Rooster建除 成 · 黃道吉
2026-07-14壬辰收心戌 Dog—平
2026-07-15癸巳開尾亥 Pig建除 開 · 黃道上吉
2026-07-16甲午閉箕子 Rat天德 · 月德 · 建除 閉吉
2026-07-17乙未建斗丑 Ox宿 斗吉
2026-07-18丙申除牛寅 Tiger黃道吉
2026-07-19丁酉滿女卯 Rabbit建除 滿吉
2026-07-20戊戌平虛辰 Dragon建除 平 · 宿 虛 · 黃道平
2026-07-21己亥定危巳 Snake天德合 · 月德合 · 宿 危上吉
2026-07-22庚子執室午 HorseFailed requirement: not_year_break大凶
2026-07-23辛丑破壁未 GoatFailed requirement: not_month_break大凶
2026-07-24壬寅危奎申 Monkey建除 危 · 黃道平
2026-07-25癸卯成婁酉 Rooster建除 成 · 黃道吉
2026-07-26甲辰收胃戌 Dog天德 · 月德上吉
2026-07-27乙巳開昴亥 Pig建除 開 · 黃道上吉
2026-07-28丙午閉畢子 Rat建除 閉凶
2026-07-29丁未建觜丑 Ox—平
2026-07-30戊申除參寅 Tiger宿 參 · 黃道吉
2026-07-31己酉滿井卯 Rabbit天德合 · 月德合 · 建除 滿上吉
Personalised next step

BaZi-Aligned Date Report — July 2026

USD 388

A personalised PDF that re-ranks every business opening-suitable day in July 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.

Should I open the business on the same day as my company registration?

If you can — yes. Aligning the opening with the legal incorporation compounds the day’s influence on both events. If they have to be different, prioritise the opening (the customer-facing first day) over the registration date.

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.