# Korea Business Day Calculator (`xman-workbook/korea-business-day-calculator`) Actor

Checked South Korean public holidays for 2025-2027, including the 2026 change that made Labour Day and Constitution Day holidays, plus exact business-day counting. Returns an error instead of a guess outside verified dates.

- **URL**: https://apify.com/xman-workbook/korea-business-day-calculator.md
- **Developed by:** [X-man Tools](https://apify.com/xman-workbook) (community)
- **Stats:** 2 total users, 1 monthly users, 100.0% runs succeeded, 0 bookmarks
- **User rating**: No ratings yet

## Pricing

from $5.00 / 1,000 calculations

This Actor is paid per event. You are not charged for the Apify platform usage, but only a fixed price for specific events.

Learn more: https://docs.apify.com/actors/running/actors-in-store.md#pay-per-event

## What's an Apify Actor?

An Actor is a serverless cloud program that runs on the Apify platform. It has two run modes.
In Batch mode, an Actor accepts a well-defined JSON input, performs an action which can take anything from a few seconds to a few hours,
and optionally produces a well-defined JSON output, datasets with results, or files in key-value store.
In Standby mode, an Actor provides a web server which can be used as a website, API, or an MCP server.

Apify vocabulary and the platform model are defined once, in the agent quickstart at https://apify.com/agents.md.

## How to integrate an Actor?

If asked about integration, you help developers integrate Actors into their projects.
You adapt to their stack and deliver integrations that are safe, well-documented, and production-ready.

Do not guess an integration path. Every one of them is in the agent quickstart at https://apify.com/agents.md: the Apify MCP server, Agent Skills with the Apify CLI, the JavaScript and Python clients, the REST API, and the account-free path for an agent with no human to sign in. It also carries the rule on stating cost before the first paid run.

For examples already wired to this Actor's own input schema, see the [API](#api) section below.

Each client library has reference documentation the quickstart does not restate: [JavaScript/TypeScript](https://docs.apify.com/api/client/js/docs.md) (`npm install apify-client`) and [Python](https://docs.apify.com/api/client/python/docs.md) (`pip install apify-client`).

# README

## Korea Business Day & Public Holiday Calculator

South Korean public-holiday lookup and business-day counting for AI agents and automations. A business day here means Monday to Friday (optionally Saturday) that is not a public holiday of Korean government offices.

### When to use this

Use it when a task needs the Korean public-holiday calendar: counting working days between two dates, finding the date N working days ahead, scheduling around Seollal and Chuseok, or checking whether a date is a public holiday in South Korea. Banks, stock exchanges, couriers and individual companies can have their own closing days; this tool does not know them.

### Why not let the model work it out

Korean public holidays changed in 2026. Labour Day (1 May) and Constitution Day (17 July) became public holidays, substitute holidays now apply to more days, and lunar holidays move every year. In 2027 Seollal itself is Sunday 7 February, the holiday period starts on 6 February, and the substitute holiday is Tuesday 9 February. A model trained before the 2026 change can count the wrong number of days. This tool carries a table checked against the sources below and does the counting deterministically.

### What it returns

| Operation | Input | Output |
|---|---|---|
| `checkDate` | `date` | weekday, `isPublicHoliday` (Sundays included), `isDesignatedHoliday` (national days, Seollal, Chuseok, substitute, temporary and election holidays), holiday name in Korean and English, `isBusinessDay` |
| `listHolidays` | `from`, `to` | every designated holiday in the range (ordinary Sundays are not listed), with weekday and whether it falls on a weekend |
| `addBusinessDays` | `from`, `days` | the date N business days after (or before) `from`, and the designated holidays skipped |
| `countBusinessDays` | `from`, `to` | `calendarDays`, `businessDays`, `designatedHolidays`, `otherNonWorkingDays` (these three add up to `calendarDays`), plus `saturdays` and `sundays` |

Successful results and handled errors (bad input, out-of-coverage dates, spending limit reached) carry `dataVersion`, `coverage` and `sources`.

Example input:

```json
{ "operation": "addBusinessDays", "from": "2026-09-23", "days": 1 }
```

Example output (shortened):

```json
{ "ok": true, "result": "2026-09-28", "resultWeekdayEn": "Mon",
  "designatedHolidaysSkipped": [
    { "date": "2026-09-24", "nameEn": "Chuseok holiday" },
    { "date": "2026-09-25", "nameEn": "Chuseok" },
    { "date": "2026-09-26", "nameEn": "Chuseok holiday" } ],
  "charged": true, "dataVersion": "2026-10-10" }
```

### Limits

- Verified dates: 2025-01-01 to 2027-12-31. Outside this range the tool returns `OUT_OF_COVERAGE` and no result. It never guesses.
- Temporary holidays and election days announced after `dataVersion` are not included until the table is updated.
- Public (government office) holidays only. Company-specific days off, bank-specific closing days and stock market closing days are not covered.
- The result is a calendar calculation, not legal advice on how a particular contract or statute counts days.

### Pricing

Pay per event. Every run has the small standard Actor start event ($0.00005). A successful result adds one `calculation` event ($0.005, that is $5 per 1,000 results). Platform usage is included. Input errors and out-of-coverage dates do not trigger the `calculation` event. If the run budget cannot cover the event, no result is returned. The event is charged before the result is stored, so in the rare case that storage fails after charging, re-run the same input and contact the developer for a refund of that event.

### Data sources

- Korea AeroSpace Administration (KASA) annual calendar notice for 2027 (월력요항), announced 2026-06-29.
- Regulations on Holidays of Government Offices (관공서의 공휴일에 관한 규정), Presidential Decree No. 36290: Labour Day in force 2026-05-01, Constitution Day in force 2026-05-11.
- Korea Astronomy and Space Science Institute calendar data for 2025-2027, used as a cross-check.

The full URLs are returned in the `sources` field.

***

한국 공휴일·영업일 계산 도구입니다. 2026년부터 노동절과 제헌절이 공휴일이 된 것, 대체공휴일, 설·추석 연휴를 반영해 영업일을 정확히 셉니다. 확인된 기간(2025~2027년) 밖의 날짜는 추측하지 않고 오류를 돌려줍니다.

# Actor input Schema

## `operation` (type: `string`):

Required arguments per operation. checkDate: date. listHolidays: from, to. addBusinessDays: from, days. countBusinessDays: from, to. All dates are YYYY-MM-DD between 2025-01-01 and 2027-12-31; a business day is Monday to Friday that is not a Korean public (government office) holiday.

## `date` (type: `string`):

Required for checkDate. YYYY-MM-DD.

## `from` (type: `string`):

Required for listHolidays, addBusinessDays, countBusinessDays. YYYY-MM-DD.

## `to` (type: `string`):

Required for listHolidays and countBusinessDays. YYYY-MM-DD, not before from.

## `days` (type: `integer`):

Required for addBusinessDays. Integer from -400 to 400. Counting starts the day after from. 0 returns from itself if it is a business day, otherwise the next business day.

## `includeFrom` (type: `boolean`):

Whether the from date itself is counted.

## `includeTo` (type: `boolean`):

Whether the to date itself is counted.

## `saturdayIsWorkingDay` (type: `boolean`):

Set true for six-day schedules. Public holidays on Saturday are still holidays.

## Actor input object example

```json
{
  "operation": "addBusinessDays",
  "from": "2026-09-23",
  "days": 1,
  "includeFrom": true,
  "includeTo": true,
  "saturdayIsWorkingDay": false
}
```

# Actor output Schema

## `results` (type: `string`):

No description

# API

You can run this Actor programmatically using our API. Below are code examples in JavaScript, Python, and CLI, as well as the OpenAPI specification and MCP server setup.

## JavaScript example

```javascript
import { ApifyClient } from 'apify-client';

// Initialize the ApifyClient with your Apify API token
// Replace the '<YOUR_API_TOKEN>' with your token
const client = new ApifyClient({
    token: '<YOUR_API_TOKEN>',
});

// Prepare Actor input
const input = {
    "operation": "addBusinessDays",
    "from": "2026-09-23",
    "days": 1
};

// Run the Actor and wait for it to finish
const run = await client.actor("xman-workbook/korea-business-day-calculator").call(input);

// Fetch and print Actor results from the run's dataset (if any)
console.log('Results from dataset');
console.log(`💾 Check your data here: https://console.apify.com/storage/datasets/${run.defaultDatasetId}`);
const { items } = await client.dataset(run.defaultDatasetId).listItems();
items.forEach((item) => {
    console.dir(item);
});

// 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/js/docs

```

## Python example

```python
from apify_client import ApifyClient

# Initialize the ApifyClient with your Apify API token
# Replace '<YOUR_API_TOKEN>' with your token.
client = ApifyClient("<YOUR_API_TOKEN>")

# Prepare the Actor input
run_input = {
    "operation": "addBusinessDays",
    "from": "2026-09-23",
    "days": 1,
}

# Run the Actor and wait for it to finish
run = client.actor("xman-workbook/korea-business-day-calculator").call(run_input=run_input)

# Fetch and print Actor results from the run's dataset (if there are any)
print(f"💾 Check your data here: https://console.apify.com/storage/datasets/{run.default_dataset_id}")
for item in client.dataset(run.default_dataset_id).iterate_items():
    print(item)

# 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/python/docs/quick-start

```

## CLI example

```bash
echo '{
  "operation": "addBusinessDays",
  "from": "2026-09-23",
  "days": 1
}' |
apify call xman-workbook/korea-business-day-calculator --silent --output-dataset

```

## MCP server setup

```json
{
    "mcpServers": {
        "apify": {
            "type": "http",
            "url": "https://mcp.apify.com/?tools=fetch-actor-details,xman-workbook/korea-business-day-calculator"
        }
    }
}
```

The hosted server signs you in with OAuth on first connect, so no API token belongs in this config. Clients without OAuth support can send an `Authorization: Bearer <APIFY_API_TOKEN>` header instead, using a token from API & Integrations in Apify Console (https://console.apify.com/settings/integrations).

## OpenAPI specification

Download the OpenAPI definition: https://api.apify.com/v2/actors/pbwK1ACeoiKjmnpeR/builds/C08DTrlIlHdUoVNTc/openapi.json