About the date difference calculator
Find exactly how much time lies between two dates — useful for deadlines, contracts, projects, and countdowns. Weekdays (Monday to Friday) are counted too.
How to use this calculator
- Pick a start date.
- Pick an end date.
- Read the difference.
Worked examples
- 365-day year, end date not counted
364 days (365 counting both dates).
Measurement guidance
Inclusive counting
Some contracts count both the first and last day. Add one day to the total for inclusive counting.
Frequently asked questions
Are leap years handled?
Yes, automatically.
Are time zones a factor?
No — dates are compared as calendar days.