---
title: "French business-day calculator: add N working days or count them between dates"
method: GET
path: "/v1/fr/business-days"
---

# French business-day calculator: add N working days or count them between dates

`GET /v1/fr/business-days`

## Request

- Base URL: `https://data.greeneris.io` (the document declares no server; this is the origin it was published from)
- URL: `https://data.greeneris.io/v1/fr/business-days`
- Auth: none declared

Adds N French business days to a date (?start=2026-07-13&add=30) or counts them over a range (?from=2026-07-01&to=2026-09-30). Skips weekends and the 11 French legal public holidays (movable feasts computed via Butcher-Meeus). mode=ouvres (Mon-Fri, default) or ouvrables (Mon-Sat). Deterministic local computation, JSON.

## Query parameters

- `start` string
- `add` integer
- `from` string
- `to` string
- `mode` 'ouvres' | 'ouvrables'

## Response `200`

Successful response

- unknown

---

[API](https://skmtc.dev/greeneris/apis/eu-verify.md) · [All operations](https://skmtc.dev/greeneris/apis/eu-verify/llms.txt) · [OpenAPI document](https://skmtc.dev/greeneris/apis/eu-verify/revisions/766cf4a67d8f?raw)