Son-eomneun-nal Calendar — Korean Moving Lucky Days
Date & TimeA son-eomneun-nal calendar converts each date in a selected Gregorian month to the Korean lunar calendar and lists lunar days 9, 10, 19, 20, 29, and 30.
Important basis and limitations
- Basis date
- Content basis date: 2026-07-07
- Scope
- General cases under Korean criteria
Reference sources
This is a reference calculation from public sources and your inputs. It may not reflect personal circumstances, recent changes, or an authority’s interpretation. Confirm with an official source or qualified professional before filing, contracting, clinical care, contraception, or another important decision.
What is it
Son-eomneun-nal is a Korean folk-calendar concept used when choosing dates for moving, opening a business, or scheduling major events. The common rule treats lunar days ending in 9 or 0 — 9, 10, 19, 20, 29, and 30 — as son-eomneun-nal. This tool converts every Gregorian date in the selected month using KASI-based korean-lunar-calendar tables and lists the matching days. It is not an official holiday, booking, cost, religious, or legal decision source, and input is not sent to a server.
How to use
- 1Choose the Gregorian month to check.
- 2Press calculate to generate the son-eomneun-nal list.
- 3Review the Gregorian date, weekday, and lunar date, then compare separately with real schedule and booking availability.
Reference
| Rule | Meaning |
|---|---|
| Lunar day 9 | ends in 9 |
| Lunar day 10 | ends in 0 |
| Lunar day 19 | ends in 9 |
| Lunar day 20 | ends in 0 |
| Lunar day 29/30 | ends in 9/0 |
Sources & standards
- 음양력 변환 계산 (Lunar-Solar Conversion) - 한국천문연구원 (KASI)
- korean-lunar-calendar — KASI-based conversion table library - usingsky (MIT License)
- MDN Web Docs: Client-side web APIs - MDN Web Docs
FAQ
Is son-eomneun-nal an official public holiday?
No. It is a folk-calendar reference, not a statutory holiday, booking availability, or pricing rule.
Are leap-month dates included?
If the converted lunar date is in a leap month, the table marks it as such. Whether to use leap-month dates depends on personal or local custom.
Is the selected month sent to a server?
No. Lunar conversion and son-eomneun-nal matching run in your browser and the input is not sent to a server.