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Date Difference
Date Difference Calculator reports the gap between two dates in days and in weeks, which is the fastest way to count down to a deadline, measure a project window or check a notice period.
How to use Date Difference
- Pick the start and end dates from the two date fields.
- Calculate to see the difference.
- Read the days figure for exactness and the weeks figure for scale.
Where Date Difference is useful
- Counting the days until a deadline or an event.
- Measuring the length of a project or a rental period.
- Checking whether a notice period falls inside a contract window.
- Working out how many full weeks a savings challenge runs for.
Formats, algorithms and limits
The difference is absolute — the order of the dates does not matter — and is measured in whole 24-hour periods between the two dates as your device understands them. Weeks are shown to one decimal place for a readable scale rather than rounded to whole weeks.
Troubleshooting and honest limits
- For inclusive counts, such as the number of days a stay covers, add one to the result.
- Both dates are interpreted at local midnight, so daylight-saving changes never add or lose a day.
- For a formal calculation involving working days, subtract weekends and public holidays from the total yourself.
Frequently asked questions
Does it include the start or end date itself?
No, it returns the interval between them. Add one day for an inclusive count in either direction.
Can I calculate business days?
Not in this tool: weekend and holiday rules vary by country and calendar, so the raw day count is the honest figure to start from.
How are time zones handled?
Both dates are taken as local calendar dates on your device, so no daylight-saving shift can move the answer by a day.
Can it handle dates far in the past or future?
Yes. Any date your browser's date picker accepts works, including historical and future years.
Related tools
Page written and reviewed by the FreeConvertio engineering team on 2026-10-14. Date Difference runs entirely in your browser — no uploads, no account and no daily limits.