# Add Finland Working Days

> Adds or subtracts Finland authority-scope working days in exact coverage.

- Calculator id: `finland-public-add-working-days` · Category: Everyday Life (`everyday`) · Tool name: `add_fi_working_days`
- Canonical page: https://tttkmbb.com/everyday/finland-public-add-working-days · This document: https://tttkmbb.com/everyday/finland-public-add-working-days.md · JSON definition: https://tttkmbb.com/everyday/finland-public-add-working-days.json

## Purpose

Adds or subtracts Finland authority-scope working days in exact coverage.

**Use when:** You need a deterministic Finland working-day offset.

**Do not use when:** Nationwide full-day public-holiday layer only. Midsummer Eve, Christmas Eve, employer, collective-agreement, sector, school, bank, Åland, Sámi and local closures are not inferred; private-sector annual-leave counting may treat Saturdays and certain eves differently.

## Example user requests

- Add or subtract Finland working days around Independence Day.
- Add or subtract Finland working days around Midsummer Eve is agreement-dependent.


## Input

| Parameter | Type | Unit | Required | Description |
| --- | --- | --- | --- | --- |
| `start_date` | date |  | required | Gregorian start date in 2026-2027. |
| `working_days` | integer |  | required | Signed offset; start date excluded for non-zero offsets. (min -1000, max 1000) |

## Output

| Field | 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. |
| `public_holidays_skipped` | list |  | Exact events crossed. |
| `territory` | string |  | FI (Finland). |
| `territory_name` | string |  | Finland |
| `day_type` | string |  | Deterministic classification: official_weekend, regular_workday, or the first published authority event kind. |
| `holiday_names` | string_list |  | Events applying on the date. |
| `holiday_kinds` | string_list |  | Authority event classifications. |
| `holiday_details` | list |  | Structured event details, including partial-day notes where published. |
| `calendar_scope` | string |  | Finland nationwide church and national full-day public holidays for 2026-2027 |
| `holiday_policy` | string |  | Finnish church and national public holidays are included; Midsummer Eve and Christmas Eve are not treated as nationwide statutory full-day holidays because their paid-day status is commonly agreement-dependent. |
| `substitute_day_policy` | string |  | No nationwide substitute-day closure is inferred when a public holiday falls on a weekend. |
| `calendar_profile` | string |  | finland-public-holidays |
| `dataset_version` | string |  | fi-nationwide-public-holidays-2026-2027.1 |
| `sources` | list |  | Authority and legislation sources. |

## Formula

`move one day at a time; decrement only on status.is_working_day=true`

Skip Saturday/Sunday and exact pinned authority events; do not add unverified substitute days.

## Data Sources

- University of Helsinki Almanac Office – Flag days and public holidays — https://almanakka.helsinki.fi/en/flag-days-and-holidays (university_authoritative_calendar)
- Bank of Finland – Bank holidays — https://www.suomenpankki.fi/en/money-and-payments/bank-holidays/ (central_bank_official_calendar)
- Finlex – Annual Holidays Act 162/2005 — https://finlex.fi/en/legislation/translations/2005/eng/162 (government_legal_text)

Data freshness: `static`. Pinned fi-nationwide-public-holidays-2026-2027.1 package.

## API

- `GET https://tttkmbb.com/api/v1/calculate/finland-public-add-working-days?start_date=…&working_days=…`
- `POST https://tttkmbb.com/api/v1/calculate/finland-public-add-working-days` 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/finland-public-add-working-days · OpenAPI operationId `add_fi_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:  `run_calculator` with `{"calculator_id": "finland-public-add-working-days", "inputs": {…}}`

## Example

- Zero offset is identity: inputs `{"start_date":"2026-01-01","working_days":0}` → `{"result_date":"2026-01-01","working_days_added":0}`

```
GET https://tttkmbb.com/api/v1/calculate/finland-public-add-working-days?start_date=2026-01-01&working_days=0
```

## Limitations

Nationwide full-day public-holiday layer only. Midsummer Eve, Christmas Eve, employer, collective-agreement, sector, school, bank, Åland, Sámi and local closures are not inferred; private-sector annual-leave counting may treat Saturdays and certain eves differently. Skip Saturday/Sunday and exact pinned authority events; do not add unverified substitute days. All values are computed from the formula above; no measurement or live data is involved.

## FAQ

**Are Midsummer Eve and Christmas Eve nationwide statutory full-day holidays?**

No. They are paid days for a large part of the population under collective agreements, but this package does not infer them as universal nationwide full-day closures.

## Related

- [Finland Working Day](https://tttkmbb.com/everyday/finland-public-working-day.md) — Inspect a date and source evidence.