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Inclusive vs Exclusive Day Counts: Which One Do You Need?

Published October 09, 2026 · By the YearsAgoCalculator team

From Monday to Friday is how many days? Four if you count the gaps, five if you count both days. Both answers are right for different purposes.

Exclusive counting

This is the standard for "days between" and "days ago". Today is day 0 and yesterday is 1 day ago. Our calculators use this convention.

Inclusive counting

Hotel stays, leave requests and event schedules often count every calendar day touched. Add 1 to an exclusive count to get the inclusive one.

Check the wording

Contracts and laws often define how days are counted, sometimes excluding weekends. When it matters, follow the official definition.

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