Official MCP RegistryListed
Japan & World Public Holidays
Public holidays, business days and long weekends for Japan (Cabinet Office) and 245 other countries.
First seen 15 Oct 2026. Evidence as of 20 Oct 2026.
4
Tools
From an anonymous probe
1
Source listings
Each with its own history
16
Recorded changes
Since first seen
Tools
| Tool | Description | Behaviour |
|---|---|---|
| business_days | Count business days between start and end (inclusive), or find the date that is N business days after start (add=N; negative N goes backward; start itself is not counted). Business day = weekday that is not a national holiday. Set year_end_closed to also skip 12/29-1/3. With country, uses that country's weekend days, holidays and make-up workdays. | Read-only |
| check_dates | For each date, tell whether it is a Japanese national holiday (with name and kind: 祝日 / 振替休日 / 国民の休日), a weekend, and a business day. Also returns today in Japan time. With country, the same for that country (holiday names, status, make-up workdays such as China's 调休). | Read-only |
| find_long_weekends | Find 連休 (3+ consecutive days off made of weekends and national holidays), e.g. Golden Week, Silver Week. Give a year, or from (default today) to list upcoming ones. With country, the same for that country. | Read-only |
| list_holidays | List Japanese national holidays for a year, or between from and to. With no arguments, lists the next 10 holidays from today (Japan time). With country, lists that country's public holidays (and make-up workdays, if any). | Read-only |
Change history
- list_holidays: input schema changed (+country, +include_government, +region)
- list_holidays: description changed (+"With country, lists that country's public holidays (and make-up workdays, if any).")
- list_holidays: annotations changed
- find_long_weekends: input schema changed (+country, +include_government, +region)
- find_long_weekends: description changed (+"With country, the same for that country.")
- find_long_weekends: annotations changed
- check_dates: input schema changed (+country, +include_government, +region)
- check_dates: description changed (+"With country, the same for that country (holiday names, status, make-up workdays such as China's 调休)." -"Use this instead of guessing weekdays or holidays.")
- check_dates: annotations changed
- business_days: input schema changed (+country, +include_government, +region)
- business_days: description changed (+"With country, uses that country's weekend days, holidays and make-up workdays.")
- business_days: annotations changed
- server instructions changed (+"onward, and public holidays of about 250 other countries and regions (pass country, an ISO 3166-1 alpha-2 code; default JP)." +"(Japan time for JP). Years" +"yet announced by the Cabinet Office are reported as unknown. Outside Japan, data covers last year to two")
- Name changed from "Japan Public Holidays" to "Japan & World Public Holidays" (registry)
- Description changed (registry)
- Listed (registry)
| Source | Listing | First seen | Last seen | Versions |
|---|---|---|---|---|
| Official MCP Registry | dev.omikuji/holiday | 15 Oct 2026 | 20 Oct 2026 | 2 |