# Add Germany Working Days

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

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

## Purpose

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

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

**Do not use when:** State, municipal, school, bank, TARGET, transport-system, collective-agreement and employer-specific schedules are not inferred.

## Example user requests

- Add or subtract Germany working days around German Unity Day.
- Add or subtract Germany working days around Ordinary weekday.


## Input

| Parameter | Type | Unit | Required | Description |
| --- | --- | --- | --- | --- |
| `start_date` | date |  | required | Gregorian start date in 2026-2026. |
| `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 |  | DE (Germany). |
| `territory_name` | string |  | Germany |
| `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 |  | Germany nationwide statutory public holidays for 2026 |
| `holiday_policy` | string |  | Only the nine holidays listed by the Bundesbank as valid for the entire Federal Republic are included; state-specific holidays are not inserted. |
| `substitute_day_policy` | string |  | No nationwide substitute-day closure is inferred when a holiday falls on a weekend. |
| `calendar_profile` | string |  | germany-national-holidays |
| `dataset_version` | string |  | de-national-holidays-2026.1 |
| `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

- Deutsche Bundesbank – Feiertage in Deutschland 2026 — https://www.bundesbank.de/resource/blob/749314/05f64c15196c20776ae7c22a2739b03c/mL/feiertage-in-deutschland-1-data.pdf (government_calendar_reference)
- Federal Ministry of Justice – Working Time Act (ArbZG), §§ 9–11 — https://www.gesetze-im-internet.de/arbzg/BJNR117100994.html (government_law)
- Federal Ministry of Justice – Road Traffic Regulations, § 30(4) — https://www.gesetze-im-internet.de/stvo_2013/__30.html (government_law)
- Federal Ministry of Justice – Unification Treaty, Article 2 — https://www.gesetze-im-internet.de/einigvtr/art_2.html (government_law)

Data freshness: `static`. Pinned de-national-holidays-2026.1 package.

## API

- `GET https://tttkmbb.com/api/v1/calculate/germany-national-add-working-days?start_date=…&working_days=…`
- `POST https://tttkmbb.com/api/v1/calculate/germany-national-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/germany-national-add-working-days · OpenAPI operationId `add_de_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": "germany-national-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/germany-national-add-working-days?start_date=2026-01-01&working_days=0
```

## Limitations

State, municipal, school, bank, TARGET, transport-system, collective-agreement and employer-specific schedules are not inferred. 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

**Does this include every German state holiday?**

No. It is the nationwide statutory core only; state and local calendars require a specific Bundesland or municipality.

## Related

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