Skip to content
Tong Shu Calendar Reference

Auspicious Business Opening Dates for August 2028開業 · August 2028

By Master Sean Chan · Updated

This month carries Li Qiu (立秋) — start of the BaZi autumn on August 7 (Singapore time): the BaZi calendar's sectional boundary for the month. Autumn proper begins with this term; Wood-day rankings tend to weaken from this point.Below is the universal Chinese metaphysics ranking of every day in August 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 August
27
pass hard requirements
5
rank as 上吉
5
top picks below
DateDay PillarOfficer 建除 Mansion 宿Clash 沖Class
12028-08-04甲子Holding午 (Horse)上吉
22028-08-22壬午Opening子 (Rat)上吉
32028-08-08戊辰Completing戌 (Dog)上吉
42028-08-10庚午Opening子 (Rat)上吉
52028-08-17丁丑Holding未 (Goat)上吉

All days in August 2028

DateDay PillarOfficerMansion ClashNotable factorsClass
2028-08-01辛酉滿卯 Rabbit建除 滿 · 宿 張
2028-08-02壬戌辰 Dragon建除 平 · 黃道
2028-08-03癸亥巳 Snake宿 軫 · 黃道
2028-08-04甲子午 Horse天德 · 月德 · 建除 執上吉
2028-08-05乙丑未 GoatFailed requirement: not_month_break大凶
2028-08-06丙寅申 MonkeyFailed requirement: not_month_break, not_year_break大凶
2028-08-07丁卯酉 Rooster月德合 · 建除 危
2028-08-08戊辰戌 Dog天德合 · 建除 成 · 黃道上吉
2028-08-09己巳亥 Pig黃道
2028-08-10庚午子 Rat建除 開 · 宿 箕上吉
2028-08-11辛未丑 Ox建除 閉 · 宿 斗 · 黃道
2028-08-12壬申寅 Tiger月德
2028-08-13癸酉卯 Rabbit天德
2028-08-14甲戌滿辰 Dragon建除 滿 · 宿 虛 · 黃道
2028-08-15乙亥巳 Snake建除 平 · 宿 危
2028-08-16丙子午 Horse黃道
2028-08-17丁丑未 Goat月德合 · 建除 執 · 黃道上吉
2028-08-18戊寅申 MonkeyFailed requirement: not_month_break, not_year_break大凶
2028-08-19己卯酉 Rooster建除 危
2028-08-20庚辰戌 Dog建除 成 · 黃道
2028-08-21辛巳亥 Pig黃道
2028-08-22壬午子 Rat月德 · 建除 開上吉
2028-08-23癸未丑 Ox天德 · 建除 閉 · 黃道
2028-08-24甲申寅 Tiger宿 參
2028-08-25乙酉卯 Rabbit宿 井
2028-08-26丙戌滿辰 Dragon建除 滿 · 黃道
2028-08-27丁亥巳 Snake月德合 · 建除 平
2028-08-28戊子午 Horse天德合 · 黃道
2028-08-29己丑未 Goat建除 執 · 宿 張 · 黃道
2028-08-30庚寅申 MonkeyFailed requirement: not_month_break, not_year_break大凶
2028-08-31辛卯酉 Rooster建除 危 · 宿 軫
Personalised next step

BaZi-Aligned Date Report — August 2028

USD 388

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

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.