Auspicious Business Opening Dates for September 2028開業 · September 2028
This month carries Bai Lu (白露) — month flips to 酉 on September 7 (Singapore time): the BaZi calendar's sectional boundary for the month. Below is the universal Chinese metaphysics ranking of every day in September 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
| Date | Day Pillar | Officer 建除 | Mansion 宿 | Clash 沖 | Class | |
|---|---|---|---|---|---|---|
| 1 | 2028-09-01 | 壬辰 | 成 Completing | 角 | 戌 (Dog) | 上吉 |
| 2 | 2028-09-28 | 己未 | 開 Opening | 軫 | 丑 (Ox) | 上吉 |
| 3 | 2028-09-14 | 乙巳 | 成 Completing | 壁 | 亥 (Pig) | 上吉 |
| 4 | 2028-09-16 | 丁未 | 開 Opening | 婁 | 丑 (Ox) | 上吉 |
| 5 | 2028-09-26 | 丁巳 | 成 Completing | 張 | 亥 (Pig) | 吉 |
All days in September 2028
| Date | Day Pillar | Officer | Mansion | Clash | Notable factors | Class |
|---|---|---|---|---|---|---|
| 2028-09-01 | 壬辰 | 成 | 角 | 戌 Dog | 月德 · 建除 成 · 黃道 | 上吉 |
| 2028-09-02 | 癸巳 | 收 | 亢 | 亥 Pig | 天德 · 宿 亢 · 黃道 | 吉 |
| 2028-09-03 | 甲午 | 開 | 氐 | 子 Rat | 建除 開 · 宿 氐 | 吉 |
| 2028-09-04 | 乙未 | 閉 | 房 | 丑 Ox | 建除 閉 · 黃道 | 凶 |
| 2028-09-05 | 丙申 | 建 | 心 | 寅 Tiger | — | 平 |
| 2028-09-06 | 丁酉 | 除 | 尾 | 卯 Rabbit | 月德合 | 吉 |
| 2028-09-07 | 戊戌 | 除 | 箕 | 辰 Dragon | 宿 箕 | 吉 |
| 2028-09-08 | 己亥 | 滿 | 斗 | 巳 Snake | 建除 滿 · 宿 斗 | 吉 |
| 2028-09-09 | 庚子 | 平 | 牛 | 午 Horse | 月德 · 建除 平 · 黃道 | 吉 |
| 2028-09-10 | 辛丑 | 定 | 女 | 未 Goat | — | 平 |
| 2028-09-11 | 壬寅 | 執 | 虛 | 申 Monkey | Failed requirement: not_year_break | 大凶 |
| 2028-09-12 | 癸卯 | 破 | 危 | 酉 Rooster | Failed requirement: not_month_break | 大凶 |
| 2028-09-13 | 甲辰 | 危 | 室 | 戌 Dog | 建除 危 | 平 |
| 2028-09-14 | 乙巳 | 成 | 壁 | 亥 Pig | 月德合 · 建除 成 | 上吉 |
| 2028-09-15 | 丙午 | 收 | 奎 | 子 Rat | 黃道 | 吉 |
| 2028-09-16 | 丁未 | 開 | 婁 | 丑 Ox | 建除 開 · 黃道 | 上吉 |
| 2028-09-17 | 戊申 | 閉 | 胃 | 寅 Tiger | 建除 閉 | 凶 |
| 2028-09-18 | 己酉 | 建 | 昴 | 卯 Rabbit | 黃道 | 吉 |
| 2028-09-19 | 庚戌 | 除 | 畢 | 辰 Dragon | 月德 | 吉 |
| 2028-09-20 | 辛亥 | 滿 | 觜 | 巳 Snake | 建除 滿 | 吉 |
| 2028-09-21 | 壬子 | 平 | 參 | 午 Horse | 四離 · 建除 平 · 宿 參 | 凶 |
| 2028-09-22 | 癸丑 | 定 | 井 | 未 Goat | 宿 井 | 吉 |
| 2028-09-23 | 甲寅 | 執 | 鬼 | 申 Monkey | Failed requirement: not_year_break | 大凶 |
| 2028-09-24 | 乙卯 | 破 | 柳 | 酉 Rooster | Failed requirement: not_month_break | 大凶 |
| 2028-09-25 | 丙辰 | 危 | 星 | 戌 Dog | 建除 危 | 平 |
| 2028-09-26 | 丁巳 | 成 | 張 | 亥 Pig | 建除 成 · 宿 張 | 吉 |
| 2028-09-27 | 戊午 | 收 | 翼 | 子 Rat | 黃道 | 吉 |
| 2028-09-28 | 己未 | 開 | 軫 | 丑 Ox | 建除 開 · 宿 軫 · 黃道 | 上吉 |
| 2028-09-29 | 庚申 | 閉 | 角 | 寅 Tiger | 月德 · 建除 閉 | 平 |
| 2028-09-30 | 辛酉 | 建 | 亢 | 卯 Rabbit | 宿 亢 · 黃道 | 平 |
BaZi-Aligned Date Report — September 2028
USD 388A personalised PDF that re-ranks every business opening-suitable day in September 2028 against your BaZi (and, for weddings/ROM, your partner’s BaZi). It surfaces:
- The single best day for you specifically in this month, plus two backups
- For each, the auspicious 2-hour window (子丑寅卯辰巳午未申酉戌亥)
- Any personal clash, 沖, or 害 hidden in the ranking above
- Notes on what to do or avoid that day to compound the effect
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.
