Date Difference Calculator (Days Between Dates)
Find how many days are left until a deadline, how long a project lasted or which date falls 90 days from today. Weekdays (Monday to Friday) are counted too.
Runs in your browser
How to use
- Choose “Days between dates” or “Add / subtract days”.
- Pick the dates (and the number of days to add).
- Read the result in days, weeks, months and weekdays.
How it works
Days are counted between calendar dates, so daylight-saving changes never add or remove an hour. By default the end date is not included (from Monday to Wednesday = 2 days); choose “Include end date” to count both ends, as for hotel stays or leave requests.
Weekdays exclude Saturdays and Sundays but not public holidays, which differ by country.
Examples
- Notice period
- From 1 March to 31 May = 91 days.
- Deadline
- 90 days after 1 January 2026 = Wednesday 1 April 2026.
Common uses
- Deadlines and notice periods
- Project and contract durations
- Counting leave days
Privacy & security
This tool runs entirely in your browser. Your files and text are never uploaded to our servers — processing happens on your device and results are created locally. How each tool handles files
Frequently asked questions
Are leap years handled?
Yes, the real calendar is used, including 29 February.
Why is the count one day short?
Turn on “Include end date” if both the first and last day should count.
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