Date Difference Calculator — Free Online Tool
Calculate the exact duration between any two dates or datetimes. The result is expressed in multiple units simultaneously — years, months, weeks, days, hours, and minutes — so you can use whatever unit is most meaningful for your context. Handles time components and daylight saving time correctly.
100% client-side. No uploads. Your data never leaves your browser.
How to use Date Difference Calculator
- Select the start date (and optionally time) in the first field.
- Select the end date in the second field.
- The difference appears in years, months, weeks, days, hours, and minutes.
- Swap the dates with the swap button if needed.
Frequently Asked Questions
Does this handle time (not just dates)?
Yes. You can enter datetimes (date + time) in both fields for sub-day precision.
Is daylight saving time accounted for?
Yes, because calculations use the browser's native Date object which correctly handles DST transitions.
Can I calculate the date of an event N days in the future?
This tool calculates the difference between two dates. For adding/subtracting days, use the timestamp converter.
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