CALENDAR NOTES
Names that traditions
have given to dates
Each calendar day has a lunar date and names from several traditions. This screen calculates those names by their rules, without judging days as good or bad. No birth information is requested.
Calendar
| Date | Weekday | Lunar date | Spirit-free day | 六曜 | 十二直 |
|---|
○ marks lunar dates ending in 9 or 0 in the spirit-free column. Rokuyo and Twelve Officers entries are traditional names, not ratings of good or bad luck.
What rules were used?
Spirit-free day
Korean folklore identifies spirit-free days as lunar dates ending in 9 or 0, when wandering spirits are said to be absent. This is documented in the National Folk Museum of Korea's encyclopedia. Lunar dates use a converter checked daily against KASI data for 1960–2026.
Encyclopedia of Korean Folk Culture: Spirit-free days ↗
六曜
Rokuyo are six Japanese calendar names. Each lunar month has a starting name: Sensho on months 1 and 7, Tomobiki on months 2 and 8, and so on, advancing daily. Japan's National Diet Library notes that the names and order settled in the late Edo period and have no single correctness standard. This Japanese custom is calculated here using Korean lunar dates.
十二直
The day whose branch matches the solar month's branch is assigned Establish, then the sequence advances daily. Solar-term days repeat the preceding name. This follows Japan's National Astronomical Observatory explanation, using KASI solar-term dates. These annotations were removed from the Japanese calendar in the Meiji reform.
What was and was not verified
- Samples from 2025–2026 matched the three rules' daily values in practitioner calendars without discrepancies.
- No public-institution source listing daily values was found. The rules themselves appear in the cited institutions' materials.
- Korean and Japanese lunar calendars can occasionally differ by one day, causing some Rokuyo entries to differ from Japanese calendars.