---
title: Business Days Calculator API.
slug: business-day-math
url: https://apyhub.com/creightonnick0/service/business-day-math
provider: nick creighton
categories: [Finance, Standard Data]
tags: [business-days, holiday-calendar, date-calculation, workday, schedule-logic]
auth: api_key
---

# Business Days Calculator API.

Calculate business-day adds, counts, checks, and holiday lists with country calendars for US, GB, CA, AU, DE, FR, and IN.

## Endpoints

| Method | Path | Description | Atoms |
| --- | --- | --- | --- |
| POST | `` | What it does Calculates business-day results using public-holiday calendars for the supported count… | 10 |

## About

## What it does
Business Day Math calculates business-day dates and counts using real public-holiday calendars for US, GB, CA, AU, DE, FR, and IN. Send a base date and a mode, and get a calendar-aware result back without having to hard-code weekend or holiday rules.

Use add mode to move forward or backward by a number of business days from a given date. Use count mode to measure the number of business days between a start and end date, with the end date treated as exclusive. Use is_business_day mode to check whether a date falls on a business day for the selected country. Use holidays mode to list the holidays for a given year and country.

The request body accepts date, start, end, days, mode, year, and country. The response returns mode, input, result, country, business_days, result_weekday, and holidays_skipped. That makes it straightforward to plug Business Day Math into scheduling flows, settlement logic, SLA calculations, or any workflow that needs to skip weekends and country-specific public holidays.

If you need date arithmetic that matches real business calendars instead of generic weekday math, Business Day Math gives you the result in a simple JSON response.

## Usage

Authenticate with an ApyHub API key in the `apy-token` header.
Full docs and a live playground: https://apyhub.com/creightonnick0/service/business-day-math