---
title: "Business Days Calculator"
method: GET
path: "/api/calc/business-days-calculator"
tags: ["DateTime"]
---

# Business Days Calculator

`GET /api/calc/business-days-calculator`

## Request

- Base URL: `https://calcbright.com`
- URL: `https://calcbright.com/api/calc/business-days-calculator`
- Auth: none declared

Count Monday–Friday working days between two dates (January 2026 has 22), or add business days to a start date to find a shipping or contract deadline.

## Query parameters

- `mode` 'count' | 'add': What do you want to do?
- `start` string, date: Start date (YYYY-MM-DD)
- `end` string, date: End date (YYYY-MM-DD)
- `days` number: Business days to add Use a negative number to go back in time.

## Response `200`

Calculation result

- CalcOutput
  - `ok` boolean
  - `tool` string
  - `name` string
  - `url` string: Open this link to see the full calculation
  - `inputs` object
  - `summary` string: Plain-text answer
  - `details` string
  - `result` object
  - `errors` object

## Other responses

- `400`: Invalid input (see errors)

---

[API](https://skmtc.dev/calcbright/apis/calcbright-calculator-api.md) · [All operations](https://skmtc.dev/calcbright/apis/calcbright-calculator-api/llms.txt) · [OpenAPI document](https://skmtc.dev/calcbright/apis/calcbright-calculator-api/revisions/f58229e56e58?raw)