# Add Business Days to Date API

> For the complete documentation index, see [llms.txt](/llms.txt).

Add or subtract business days from a date, skipping weekends under a configurable workweek pattern.

Use this endpoint to add the tool to your app, site, workflow, or agent without rebuilding formulas, validation, examples, and docs.

- Slug: `add-business-days-to-date`
- Category: `time-date`
- Version: `2026-04-22`
- Credits per successful call: 1
- Starts on: free
- Max payload: 65536 bytes
- Privacy mode: `hash_only`
- Available on: free, starter, pro, business, scale
- Browser tool: https://miniwebtool.com/add-business-days-to-date/

## Endpoint

`POST https://api.miniwebtool.com/v1/tools/add-business-days-to-date/run`

## Request body

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `start_date` | `str` | yes | ISO date YYYY-MM-DD |
| `business_days` | `int` | no |  |
| `direction` | `str` | no | add | subtract Choices: add, subtract |
| `workweek` | `str` | no | mon_fri | mon_sat | sun_thu | mon_sun Choices: mon_fri, mon_sat, sun_thu, mon_sun |
| `start_adjust` | `str` | no | keep | next | prev Choices: keep, next, prev |

## Example request

```json
{
  "start_date": "2026-07-20",
  "business_days": 10,
  "direction": "add",
  "workweek": "mon_fri"
}
```

## cURL

```bash
curl -X POST https://api.miniwebtool.com/v1/tools/add-business-days-to-date/run \
  -H 'Authorization: Bearer mwt_live_YOUR_KEY' \
  -H 'Content-Type: application/json' \
  -d '{"start_date":"2026-07-20","business_days":10,"direction":"add","workweek":"mon_fri"}'
```

## Response envelope

```json
{
  "request_id": "01K...",
  "tool": "add-business-days-to-date",
  "tool_version": "2026-04-22",
  "credits_used": 1,
  "result": {}
}
```

## Errors

Errors are RFC 7807 `application/problem+json`. Branch on `code`, not `title`.

## MCP

Agents can discover and call this tool through `https://api.miniwebtool.com/mcp` or `https://api.miniwebtool.com/v1/mcp` using MCP `tools/list` and `tools/call`.

## Frequently asked

### What does the Add Business Days to Date API do?

Add or subtract business days from a date, skipping weekends under a configurable workweek pattern. Use it to add this utility without rebuilding formulas, validation, examples, and documentation.

### How much does one call cost?

1 credit per successful call. Failed calls do not bill.

### What parameters are required?

Required fields: start_date. Full schema at `https://api.miniwebtool.com/v1/openapi.json`.

### Is this deterministic?

Yes. Same input, same output. Tool version: 2026-04-22.