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Client-side ProcessingUpdated 2026-02-11Report issue

Runs fully in your browser. Inputs stay on your device. See recent fixes on changelog.

Date Difference Calculator

Calculate the difference between two dates in various units.

FreeRuns in browserdate difference calculatordays between dates
Cmd/Ctrl+Enter Primary actionCmd/Ctrl+Shift+L Load sampleCmd/Ctrl+Shift+X Clear/resetCmd/Ctrl+Shift+C Copy result

About Date Difference Calculator

Calculate the difference between two dates in various units. Calculate the difference between two dates online for free. Get results in days, weeks, months, and years with a human-readable breakdown of the time span. Uses precise mathematical formulas with clear, formatted results. Input validation prevents errors and guides correct usage, ensuring reliable computations every time. Everything runs client-side in your browser for maximum speed and privacy — no data is sent to any server, and no signup is required.

Related tools: Add Days to Date, Days Between Dates Calculator, Months Between Dates Calculator

How to Use Date Difference Calculator

  1. Fill in the required input fields with your values.
  2. Click Calculate to run the computation.
  3. View the results below the form.

Frequently Asked Questions

What is Date Difference Calculator?
Calculate the difference between two dates online for free. Get results in days, weeks, months, and years with a human-readable breakdown of the time span.
How are calculations performed?
Calculations use precise mathematical formulas implemented in JavaScript. The underlying formulas are well-documented and validated against known reference values to ensure correctness.
Can I use decimal values?
Yes, all input fields accept decimal numbers with full floating-point precision. You can enter values with as many decimal places as you need and the tool will compute accurate results.
Are the formulas used shown?
Where applicable, the tool displays the formula or methodology used so you can verify the computation yourself. This transparency helps you understand and trust the results.
Is Date Difference Calculator free to use?
Yes, this calculator is completely free to use. No account or signup is needed, and all computations run locally in your browser without any restrictions.
Is my data safe when using Date Difference Calculator?
Absolutely. Every calculation runs locally in your browser. No input data is transmitted to any server, ensuring your numbers stay private.

Related Tools

Add Days to Date
Add a number of days to any date and get the result.
Days Between Dates Calculator
Count the exact number of days between two dates.
Months Between Dates Calculator
Calculate the number of months between two dates.