Date Difference Calculator
Free online Date Difference Calculator. Find the exact difference in years, months, days, weeks, and total days between two dates. Toggle inclusive or exclusive counting, and use the Add/Subtract mode to add days, weeks, or months to any starting date. 100% private, fast, and runs locally in your browser.
Your files never leave your device. All processing happens on your device. No uploads, ever.
How to use Date Difference Calculator
- 1
Select Start & End Dates
Choose two dates to calculate elapsed time.
- 2
Toggle Inclusive Counting
Optionally include the end date for event or work counts.
- 3
Use Add/Subtract Mode
Switch tabs to calculate a future or past date by adding days/months.
Exact Date Difference with Inclusive / Exclusive Counting
Our pure date engine accurately counts calendar difference between two dates. Toggle 'Include end date (+1 day)' for workdays, rental durations, or inclusive period calculations.
Add & Subtract Days, Weeks, Months, or Years
Need to know what date is 45 days from today or 6 months ago? Use the built-in Add/Subtract mode for instant calendar arithmetic.
Frequently asked questions
What is the difference between inclusive and exclusive date counting?
Exclusive counting calculates elapsed time from Start Date to End Date (e.g. Jan 1 to Jan 2 = 1 day). Inclusive counting includes both start and end days (e.g. Jan 1 to Jan 2 = 2 days).
How are month-end dates handled when adding months?
When adding 1 month to Jan 31 in a non-leap year, the result lands on Feb 28 to prevent overflow into March.
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Last updated 10 August 2026