FTB-C000063 / Financial concept

Business Day

A business day is a date considered operational for a specified market, institution, currency, or contractual process.

Also known asworking day

Foundation 1 linked topicPublished

Definitions

In plain terms

A day can be a business day for one market and a holiday for another, so the relevant calendar must always be named.

Technical

Business-day calculations require a calendar identifier, jurisdiction or product scope, holiday version, and roll convention when moving dates.

Scope

It is not universally equivalent to Monday through Friday or to a trading day.

Examples

  • A governed dataset records business day explicitly instead of inferring it from an ambiguous field.

Common misconceptions

  • Business Day does not have one universal meaning without its stated market, source, and time context.

Concept relationships

Related

Contrasts with

Where this concept is used

Tutorials planned

These catalogued topics use this concept, but their complete build has not shipped yet.

  • D01-F03-A04 Important

Evidence and governance

  1. NYSE Trading Hours and Calendars New York Stock Exchange · official exchange

    Supports: preferred label, short definition, technical definition

    Limits: Hours vary by venue, product, date, rule version, and exceptional notice; they are not a universal calendar.

  2. Fintech Builder Glossary Definition Contract The Fintech Builder · internal governed contract

    Supports: variant distinction

    Limits: Defines governed platform behavior rather than claiming these policies are universally prescribed by external McClellan methodology.

Reviewed by
Last reviewed
2026-07-26
Next review
2027-07-26
Record status
published
Written by

Fintech engineer building market-data and financial systems, and the author of every article, glossary record, and reference implementation on The Fintech Builder.