Date Difference Calculator
Count days, weeks, and months between two dates.
- Browser-based
- No signup
Everyday Tools
Enter a date of birth and an optional calculation date to find age in years, months, and days, plus totals in months, weeks, and days. All calculations run in your browser.
Enter a date of birth and calculate to see results.
Enter a date of birth and an optional calculation date to find age in years, months, and days, plus totals in months, weeks, and days. All calculations run in your browser.
Use the Age Calculator form near the top of this page. Enter the values you know, run the tool, and review the results panel. You can change inputs and run it again. Processing stays in your browser and is not uploaded to Utilnivo servers.
Example: open Age Calculator, enter a realistic set of inputs for your situation, and note the primary result. Change one input—such as an amount, rate, or option—and compare how the output changes so you can choose a scenario that fits your needs.
Second example: try edge cases that matter for your task—such as zero values, a different unit system, or a second file—and confirm the tool shows a clear result or a helpful validation message.
The age calculator counts complete years, months, and days between the date of birth and the calculation date. It also reports totals in months, weeks, and days. All math runs locally in your browser.
This tool runs in your browser for convenience. Results are estimates or transformations based on the inputs you provide and may not cover every edge case.
Age is calculated from the date of birth to the selected calculation date by counting complete years, then remaining months, then remaining days.
Yes. Leave the calculation date blank to use today, or choose any date on or after the date of birth.
No. A date of birth in the future is invalid and will show an error.