# Count Japan National Working Days

> Counts Japan statutory-baseline working and non-working dates for a pinned year range.

- Calculator id: `japan-national-working-days-between` · Category: Everyday Life (`everyday`) · Tool name: `count_japan_national_working_days`
- Canonical page: https://tttkmbb.com/everyday/japan-national-working-days-between · This document: https://tttkmbb.com/everyday/japan-national-working-days-between.md · JSON definition: https://tttkmbb.com/everyday/japan-national-working-days-between.json

## Purpose

Counts Japan statutory-baseline working and non-working dates for a pinned year range.

**Use when:** You need an auditable Japan statutory national-holiday working-day count.

**Do not use when:** You need a company, school, bank, exchange or prefectural closure calendar.

## Example user requests

- Count Japan working days from 2027-03-01 to 2027-03-31.


## Input

| Parameter | Type | Unit | Required | Description |
| --- | --- | --- | --- | --- |
| `start_date` | date |  | required | First date in 2026-2027. |
| `end_date` | date |  | required | Last date in 2026-2027. |
| `include_start_date` | boolean |  | optional, default true | Whether start_date participates. |
| `include_end_date` | boolean |  | optional, default true | Whether end_date participates. |

## Output

| Field | Type | Unit | Description |
| --- | --- | --- | --- |
| `normalized_start_date` | date |  | Earlier endpoint. |
| `normalized_end_date` | date |  | Later endpoint. |
| `working_days` | integer |  | Japan statutory-baseline working dates. |
| `non_working_days` | integer |  | Weekend and statutory holiday dates. |
| `national_holidays_counted` | list |  | Cabinet Office events in the range. |
| `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. |

## Formula

`for each included date: working_days += Japan national status.is_working_day`

Normalize endpoints, apply endpoint flags, and count the pinned Japan calendar over the CLDR weekend baseline.

## Data Sources

- Cabinet Office of Japan - National Holidays — https://www8.cao.go.jp/chosei/shukujitsu/gaiyou.html (government, published 2026-09-29)
- Act on National Holidays (Act No. 178 of 1948) — https://laws.e-gov.go.jp/law/323AC0000000178 (legislation)

Data freshness: `static`. Pinned Cabinet Office 2026-2027 package.

## API

- `GET https://tttkmbb.com/api/v1/calculate/japan-national-working-days-between?start_date=…&end_date=…`
- `POST https://tttkmbb.com/api/v1/calculate/japan-national-working-days-between` with JSON body `{"inputs": {…}}`
- Response: unified envelope (`success`, `request`, `result.values`, `result.units`, `sources`, `freshness`, `timestamp`, `next_actions`, `links`); see https://tttkmbb.com/docs/response-format.md
- Schema: https://tttkmbb.com/api/v1/calculators/japan-national-working-days-between · OpenAPI operationId `count_japan_national_working_days` in https://tttkmbb.com/openapi.json
- Authentication: none. Rate limit: fair use, see https://tttkmbb.com/docs/rate-limits.md.

## MCP

- Server: `https://tttkmbb.com/mcp` (Streamable HTTP, JSON-RPC 2.0, no auth)
- Tool: `count_japan_national_working_days` (dedicated) or `run_calculator` with `{"calculator_id": "japan-national-working-days-between", "inputs": {…}}`

## Example

- March 2027: inputs `{"start_date":"2027-03-01","end_date":"2027-03-31","include_start_date":true,"include_end_date":true}` → `{"working_days":22}`

```
GET https://tttkmbb.com/api/v1/calculate/japan-national-working-days-between?start_date=2027-03-01&end_date=2027-03-31&include_start_date=true&include_end_date=true
```

## Limitations

You need a company, school, bank, exchange or prefectural closure calendar. Normalize endpoints, apply endpoint flags, and count the pinned Japan calendar over the CLDR weekend baseline. All values are computed from the formula above; no measurement or live data is involved.

## FAQ

**Is this a general Japanese business calendar?**

No. It is explicitly scoped to statutory national holidays.

## Related

- [Japan National Holiday Working Day](https://tttkmbb.com/everyday/japan-national-working-day.md) — Inspect a date and its official legal basis.