# Add South Korea Working Days

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

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

## Purpose

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

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

**Do not use when:** The package covers the 2026 statutory/public-office schedule only; private-employer, school, bank, exchange, local-government and 2027 schedules are not inferred.

## Example user requests

- Add or subtract South Korea working days around New Labor Day public holiday.
- Add or subtract South Korea working days around Published substitute holiday.


## 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 |  | KR (South Korea). |
| `territory_name` | string |  | South Korea |
| `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 |  | South Korea statutory public holidays and public-office substitute holidays for 2026 |
| `holiday_policy` | string |  | National, substitute and election holiday event kinds are preserved; this is not a universal private-employer or school closure calendar. |
| `substitute_day_policy` | string |  | Only the published 2026 substitute dates are included; employer exchanges, local-government holidays and school schedules are not inferred. |
| `calendar_profile` | string |  | south-korea-public-holidays |
| `dataset_version` | string |  | kr-public-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

- Korea National Law Information Center – public holidays regulation — https://www.law.go.kr/LSW/lsLinkCommonInfo.do?lsJoLnkSeq=1033028569 (government_law)
- Ministry of Personnel Management – Labor Day and Constitution Day public holidays — https://www.mpm.go.kr/mpm/comm/newsPress/newsPressRelease/?boardId=bbs_0000000000000029&category=&cntId=4250 (government_press_release)
- Ministry of Employment and Labor – Labor Day public-holiday implementation — https://moel.go.kr/news/enews/report/enewsView.do?news_seq=19254 (government_press_release)
- Korea Astronomy and Space Science Institute – 2026 calendar data — https://astro.kasi.re.kr/kor/life/post/calendarData?search_year=2026 (government_calendar_reference)

Data freshness: `static`. Pinned kr-public-holidays-2026.1 package.

## API

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

## Limitations

The package covers the 2026 statutory/public-office schedule only; private-employer, school, bank, exchange, local-government and 2027 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 represent every Korean employer's closure calendar?**

No. It is a statutory/public-office evidence package for 2026; employer, school, bank, exchange and local schedules are not inferred.

## Related

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