---
title: "Day Count Fraction"
method: POST
path: "/quantlib/core/periods/day-count-fraction"
tags: ["quantlib-core"]
---

# Day Count Fraction

`POST /quantlib/core/periods/day-count-fraction`

## Request

- Base URL: `https://api.fincept.in` (the document declares no server; this is the origin it was published from)
- URL: `https://api.fincept.in/quantlib/core/periods/day-count-fraction`
- Auth: API key in header `X-API-Key`

Calculate day count fraction between two dates

## Request body

- DayCountFractionRequest
  - `start_date` string, required
  - `end_date` string, required
  - `convention` string

## Response `200`

Successful Response

- unknown

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/fincept/apis/fincept-api.md) · [All operations](https://skmtc.dev/fincept/apis/fincept-api/llms.txt) · [OpenAPI document](https://skmtc.dev/fincept/apis/fincept-api/revisions/e9c0076ea55a?raw)