# Add Switzerland Working Days

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

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

## Purpose

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

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

**Do not use when:** Federal layer only. Cantonal public holidays, municipal holidays, employer, collective-agreement, school, bank and exchange schedules are not inferred; Swiss law permits cantons to recognize additional holidays.

## Example user requests

- Add or subtract Switzerland working days around Swiss National Day.
- Add or subtract Switzerland working days around Cantonal holiday is not inferred.


## 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 |  | CH (Switzerland). |
| `territory_name` | string |  | Switzerland |
| `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 |  | Switzerland federal public holiday layer for 2026-2027 |
| `holiday_policy` | string |  | Swiss National Day on 1 August is included as the only federal public holiday. |
| `substitute_day_policy` | string |  | No nationwide substitute-day closure is inferred when 1 August falls on a weekend. |
| `calendar_profile` | string |  | switzerland-public-holidays |
| `dataset_version` | string |  | ch-federal-public-holiday-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

- Swiss Confederation ch.ch – Public holidays — https://www.ch.ch/en/work/working-hours/vacation--public-holidays-and-absences-from-work/ (swiss_confederation_official_guidance)
- SECO – Leisure time and public holidays — https://www.seco.admin.ch/seco/en/home/Arbeit/Arbeitsbedingungen/Arbeitsgesetz-und-Verordnungen/FAQ/freizeit-und-feiertage.html (swiss_federal_labour_authority)
- Swiss Confederation – National holiday — https://www.aboutswitzerland.eda.admin.ch/en/national-holiday-and-national-anthem (swiss_federal_authority)

Data freshness: `static`. Pinned ch-federal-public-holiday-2026-2027.1 package.

## API

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

## Limitations

Federal layer only. Cantonal public holidays, municipal holidays, employer, collective-agreement, school, bank and exchange schedules are not inferred; Swiss law permits cantons to recognize additional holidays. 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 package include Swiss cantonal holidays?**

No. The Swiss Confederation identifies 1 August as the only federal public holiday; cantonal holidays vary and require a canton-specific package.

## Related

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