Skip to content
March 25, 2024 • 3 min Read time

What is a Business Day? Definition & Rules

Learn everything about the term business day, how it differs from a working day and what to consider for deadlines.

Felix Schmidt
Felix Schmidt
Mathematician & Author

✓Key Takeaways

  • All calculations are based on standardized algorithms (ISO 8601).
  • Recognize patterns better to set deadlines more precisely.
  • The math behind calendars makes daily work noticeably easier.

Definition: Business Day

A business day is a day on which work is normally performed. Unlike the calendar day or working day, weekends and public holidays are excluded.

Difference to Working Day

These terms are often confused. In many regions, all calendar days that are not Sundays or public holidays are considered working days (including Saturdays). A business day, however, mostly refers to the individual 5-day week (Monday to Friday).

Relevance for Deadlines

When employment contracts mention "business days", Saturdays do not count. But if they say "working days", Saturday must be included in the deadline calculation. With our calculator, you can precisely distinguish both variants.

Putting theory into practice

Calculate your date now