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Date Difference Calculator — Free Online Tool

Find the exact number of days, weeks, months and years between any two dates — perfect for age gaps, countdowns and project timelines.

Your result will appear here after you pick two dates.
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Total days
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Weeks + days
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Total hours
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Total minutes
Calendar breakdown
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Instant results — no waiting
No sign-up needed
Free forever

How it works

1Pick a start date and an end date using the date pickers above.
2Press Calculate — or just change a date and the result updates live.
3Read the days, weeks and calendar breakdown instantly below.

Frequently asked questions

How is the calendar breakdown (years, months, days) calculated?

Total days are counted as 24-hour periods between the two midnights, while the calendar breakdown walks the real calendar — borrowing days and months exactly the way a calendar does, so leap years and month lengths are handled correctly.

What happens if the end date is before the start date?

Nothing breaks — the difference is shown as a negative value with a note, so you can tell the dates are reversed. Press the "Swap dates" button to flip them and get a positive result.

Are both the start and end dates counted?

The main result counts the days between the dates (exclusive): 1 January to 2 January is 1 day. If you need both endpoints included, the result also shows the inclusive count — just add one extra day.

Calendar-accurate breakdown · 100% local — your dates never leave this page.