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Date Difference Calculator
Calculate absolute days, date direction, inclusive days, and approximate weeks between two dates in your browser.
Professional tool panel
Date range calculator with rule dashboard
Absolute days exclude the end date. Inclusive days include both selected dates.
Options / presets
Use presets to compare same-month and reversed ranges. Reversed dates remain valid and show direction.
How to use
- Choose a start date and an end date.
- Use the example dates to confirm how absolute and inclusive days are displayed.
- Review direction, absolute days, inclusive days, and approximate weeks, then copy the result if needed.
How this tool works
- The calculator converts both selected dates to local calendar dates and compares the day difference.
- Absolute days is the elapsed gap and does not include the end date.
- Inclusive days adds one to the absolute gap so both selected dates are counted; weeks are shown as an approximate decimal conversion.
Use cases
- Plan trips by comparing check-in and check-out dates with clear inclusive-day context.
- Count project or contract date gaps while seeing whether the range is forward or reversed.
- Convert a date gap into approximate weeks for planning notes or schedules.
Examples
- 2026-01-01 to 2026-01-31 gives 30 absolute days and 31 inclusive days.
- Use reverse dates to confirm whether the end date is before the start date while keeping the absolute day count readable.
- Trip planning can use inclusive days when both the first and last selected dates should be counted.
FAQ
Does absolute days include the end date?
No. Absolute days counts the elapsed day difference between the two dates.
What are inclusive days?
Inclusive days counts both selected dates, so it is the absolute day difference plus one.
Can the end date be earlier than the start date?
Yes. The result shows the direction and still reports the absolute day count.
Privacy note
The selected dates are calculated locally in your browser. No dates are uploaded and no login is required.
Related tools
Continue with nearby browser-local utilities.
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