About the Date Difference Calculator
Count exactly how many days there are between two dates, for notice periods, deadlines, leave planning or countdowns. Working days (Monday–Friday) are shown too.
How to use the Date Difference Calculator
- Pick the start date.
- Pick the end date.
- Tick “include end date” if you want to count both days.
- Read the total days, weeks, months and working days.
Formula used
Days = end date − start date (+1 if the end date is included). Working days count Monday to Friday only; public holidays are not removed.
Frequently asked questions
Does it count weekends?
The total includes all days. Working days exclude Saturdays and Sundays but not public holidays.
Should I include the end date?
Include it when both the first and last day count, such as leave or hotel stays counted by day.
Can I count days until a future date?
Yes. Set today as the start and your event as the end date.
Last reviewed: November 7, 2026