Home › Everyday Life › Japan National Holiday Working Day
Japan National Holiday Working Day
Checks a date against Japan's statutory national holidays and Saturday/Sunday baseline.
When to use
You need Japan statutory national-holiday status for 2026-2027.
Do not use when: You need a company, school, bank, exchange or prefectural closure calendar.
Example user requests
- Is 2027-03-22 a Japan working day?
Formula
is_working_day = Japan weekday baseline and no Cabinet Office statutory holiday
Apply the pinned Cabinet Office national-holiday table on top of the CLDR Japan weekend baseline.
Inputs
| Parameter | Type | Unit | Required | Description |
|---|---|---|---|---|
date | date | yes | Gregorian date in the pinned Cabinet Office 2026-2027 coverage. |
Outputs
| Output | Type | Unit | Description |
|---|---|---|---|
territory | string | JP. | |
territory_name | string | Japan. | |
weekday | string | Gregorian weekday. | |
is_working_day | boolean | True when the Japan Saturday/Sunday baseline is a weekday and no statutory national holiday applies. | |
day_type | string | Regular weekday, regular weekend or statutory national holiday. | |
holiday_names | string_list | Japanese statutory holiday names applying on the date. | |
holiday_kinds | string_list | National holiday or statutory holiday under the Cabinet Office table. | |
holiday_legal_bases | string_list | Holiday Act or Cabinet Office legal classification. | |
weekend_days | string_list | CLDR Saturday/Sunday baseline. | |
calendar_scope | string | Japan statutory national holidays only. | |
rest_day_policy | string | Company, school, bank and exchange closures are not inferred. | |
calendar_profile | string | jp-cabinet-office-national-holidays. | |
dataset_version | string | Pinned Cabinet Office evidence package. | |
sources | list | Official Cabinet Office and legislation sources. |
Example
Article 3(2) statutory holiday: {"date":"2027-03-22"} → {"is_working_day":false,"holiday_kinds":["statutory_holiday"]}
GET https://tttkmbb.com/api/v1/calculate/japan-national-working-day?date=2027-03-22
Machine access
- API:
GET https://tttkmbb.com/api/v1/calculate/japan-national-working-day(query parameters) orPOSTwith a JSON body{"inputs": {...}} - Schema: https://tttkmbb.com/api/v1/calculators/japan-national-working-day · Markdown: https://tttkmbb.com/everyday/japan-national-working-day.md · JSON definition: https://tttkmbb.com/everyday/japan-national-working-day.json
- MCP: server
https://tttkmbb.com/mcp, toolcheck_japan_national_working_day - OpenAPI operationId:
check_japan_national_working_day - Freshness:
static. Authentication: none. Rate limit: fair use (see rate limits).
Sources
- Cabinet Office of Japan - National Holidays (government)
- Act on National Holidays (Act No. 178 of 1948) (legislation)
FAQ
Does this cover Japanese company holidays?
No. It is limited to statutory national holidays and the Japan Saturday/Sunday baseline.
Related calculators
- Add Japan National Working Days — Offset using the same statutory national-holiday evidence package.