Date Difference Calculator
Find the days, weeks and weekdays between two dates.CalculatorsDate difference calculator
Measure the gap between two dates in days, weeks, weekdays and calendar approximations.
About this tool
Counting days by hand goes wrong around leap years and month boundaries. Enter two calendar dates and get the gap in days, weeks, weekdays and approximate months and years, plus a direction.
How to use the Date Difference Calculator tool
- Pick two dates. Use the two date inputs to choose a start and end date.
- Read the difference. Click Calculate. Days, weeks, weekdays, approximate months and years, and the direction are shown.
- Reverse if needed. Put the dates in the opposite fields to reverse the comparison; the result is labelled past, future or same.
Supported formats
Input
- Two calendar dates (YYYY-MM-DD)
Output
- Total days
- Weeks and weekdays
- Approximate months and years
- Direction (past / future / same)
Inputs are validated before anything is processed. Invalid values and unsupported files are rejected with a clear error instead of failing silently.
Frequently asked questions
Is the result inclusive?
The day difference is exclusive of the start date. Weekdays are counted from the day after the start date up to and including the end date.
Are leap years handled?
Yes. The calculation works with UTC calendar dates, so February 29 is counted correctly.
What do months and years mean here?
They are approximations based on average calendar lengths (30.44 and 365.24 days), not calendar month boundaries.
Can I use times as well?
This tool works with calendar dates only. For exact second-level values use the Unix Timestamp Converter.
Privacy
Everything you enter stays in this browser tab. There is no upload endpoint for tool inputs, no account, and no server-side copy of your text or files. Results are produced locally and disappear when you close the page.
No account is required and no file is ever uploaded. See the privacy policy for details about analytics and the limited data this site stores.
Known limitations
- Only calendar dates are compared; times of day and timezones are not part of the calculation.
- Months and years use average calendar lengths, so they are approximations rather than calendar boundaries.
- Dates are interpreted at UTC midnight to avoid daylight-saving shifts.
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