Date Difference Calculator

Calculate the exact span between two dates. Get the duration in days, weeks, months, and years with surgical precision.

100% Secure. Processed locally.
Pick two dates to see the duration between them

Smart Date Intelligence

Inclusive Range

Need to count the very last day? Toggle our "Include last day" feature to switch between standard and inclusive date spans.

Total Breakdowns

Beyond just days, see the total time in weeks, months, years, and even hours or minutes for precise project planning.

Comparative Metrics

Visualize how much of an average year your selected span takes up with our dynamic percentage progress bar.

Your Calendar, Your Business

Whether you're tracking an anniversary or planning a sensitive project, your dates shouldn't be sent over the web. Our calculator works 100% offline once loaded, using local CPU power to crunch the numbers.

No Tracking
Local Calculation
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Frequently Asked Questions

Does it account for leap years?
Yes. The calculator utilizes standard chronological libraries that correctly account for February 29th and the varying lengths of all months throughout the year.
Why "Include last day"?
Standard date subtraction usually counts the sleep/night gaps between days. If you are tracking a 3-day event (e.g. Friday to Sunday), you might want to "Include last day" to count all three full days instead of just the 2-day gap.