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Add Japan National Working Days
Adds or subtracts dates using the pinned Japan statutory national-holiday schedule and weekend baseline.
When to use
You need a deterministic Japan statutory national-holiday date offset in 2026-2027.
Do not use when: You need company, school, bank, exchange or prefectural closure semantics.
Example user requests
- Add five Japan national working days after 2027-03-19.
Formula
move one day at a time; decrement remaining only when Japan national status.is_working_day=true
Skip the Japan weekend baseline and pinned Cabinet Office holiday dates.
Inputs
| Parameter | Type | Unit | Required | Description |
|---|---|---|---|---|
start_date | date | yes | Gregorian start date in 2026-2027. | |
working_days | integer | yes | Signed offset; start date is excluded for non-zero offsets. Range: ≥ -1000, ≤ 1000 |
Outputs
| Output | Type | Unit | Description |
|---|---|---|---|
start_date | date | Input date. | |
result_date | date | Date reached. | |
working_days_added | integer | Signed requested offset. | |
calendar_days_elapsed | integer | Signed Gregorian difference. | |
national_holidays_skipped | list | Statutory holidays crossed. | |
territory | string | JP. | |
territory_name | string | Japan. | |
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
Offset across March 22 statutory holiday: {"start_date":"2027-03-19","working_days":1} → {"result_date":"2027-03-23"}
GET https://tttkmbb.com/api/v1/calculate/japan-national-add-working-days?start_date=2027-03-19&working_days=1
Machine access
- API:
GET https://tttkmbb.com/api/v1/calculate/japan-national-add-working-days(query parameters) orPOSTwith a JSON body{"inputs": {...}} - Schema: https://tttkmbb.com/api/v1/calculators/japan-national-add-working-days · Markdown: https://tttkmbb.com/everyday/japan-national-add-working-days.md · JSON definition: https://tttkmbb.com/everyday/japan-national-add-working-days.json
- MCP: server
https://tttkmbb.com/mcp, tooladd_japan_national_working_days - OpenAPI operationId:
add_japan_national_working_days - 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 resolve employer-specific substitute days?
No. Only statutory national holidays in the official table are applied.
Related calculators
- Japan National Holiday Working Day — Inspect one date and its official legal classification.