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Tong Shu Calendar Reference

Auspicious Business Opening Dates for July 2028開業 · July 2028

By Master Sean Chan · Updated

This month carries Xiao Shu (小暑) — month flips to 未 on July 6 (Singapore time): the BaZi calendar's sectional boundary for the month. Below is the universal Chinese metaphysics ranking of every day in July 2028 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
26
pass hard requirements
7
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12028-07-20己酉滿 Filling壁卯 (Rabbit)上吉
22028-07-15甲辰收 Gathering牛戌 (Dog)上吉
32028-07-10己亥定 Stabilising房巳 (Snake)上吉
42028-07-28丁巳開 Opening井亥 (Pig)上吉
52028-07-30己未建 Establishing柳丑 (Ox)上吉

All days in July 2028

DateDay PillarOfficerMansion ClashNotable factorsClass
2028-07-01庚寅成鬼申 MonkeyFailed requirement: not_year_break大凶
2028-07-02辛卯收柳酉 Rooster月德合 · 黃道吉
2028-07-03壬辰開星戌 Dog建除 開吉
2028-07-04癸巳閉張亥 Pig建除 閉 · 宿 張凶
2028-07-05甲午建翼子 Rat黃道吉
2028-07-06乙未建軫丑 Ox宿 軫吉
2028-07-07丙申除角寅 Tiger黃道吉
2028-07-08丁酉滿亢卯 Rabbit建除 滿 · 宿 亢平
2028-07-09戊戌平氐辰 Dragon建除 平 · 宿 氐 · 黃道平
2028-07-10己亥定房巳 Snake天德合 · 月德合 · 黃道上吉
2028-07-11庚子執心午 Horse建除 執吉
2028-07-12辛丑破尾未 GoatFailed requirement: not_month_break大凶
2028-07-13壬寅危箕申 MonkeyFailed requirement: not_year_break大凶
2028-07-14癸卯成斗酉 Rooster建除 成 · 宿 斗 · 黃道上吉
2028-07-15甲辰收牛戌 Dog天德 · 月德上吉
2028-07-16乙巳開女亥 Pig建除 開 · 黃道上吉
2028-07-17丙午閉虛子 Rat建除 閉 · 宿 虛大凶
2028-07-18丁未建危丑 Ox宿 危平
2028-07-19戊申除室寅 Tiger黃道吉
2028-07-20己酉滿壁卯 Rabbit天德合 · 月德合 · 建除 滿上吉
2028-07-21庚戌平奎辰 Dragon建除 平 · 黃道平
2028-07-22辛亥定婁巳 Snake黃道吉
2028-07-23壬子執胃午 Horse建除 執吉
2028-07-24癸丑破昴未 GoatFailed requirement: not_month_break大凶
2028-07-25甲寅危畢申 MonkeyFailed requirement: not_year_break大凶
2028-07-26乙卯成觜酉 Rooster建除 成 · 黃道吉
2028-07-27丙辰收參戌 Dog宿 參吉
2028-07-28丁巳開井亥 Pig建除 開 · 宿 井 · 黃道上吉
2028-07-29戊午閉鬼子 Rat建除 閉凶
2028-07-30己未建柳丑 Ox天德合 · 月德合上吉
2028-07-31庚申除星寅 Tiger黃道吉
Personalised next step

BaZi-Aligned Date Report — July 2028

USD 388

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

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.