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Date Difference Calculator

Calculate the exact time between two dates in years, months, weeks and days. Free date duration calculator for deadlines, anniversaries and planning.

Order doesn't matter — the difference is always shown as a positive duration.

Difference

Pick two dates to see the gap between them.

About Date Difference Calculator

The Date Difference Calculator measures the exact time between any two dates — broken down into years, months and days, plus totals in months, weeks, days and hours. Pick the dates in either order; the result is always shown as a positive duration.

It's useful for counting days until a deadline or event, working out the length of a project or employment period, checking contract durations or figuring out how many days old something is.

The math uses real calendar months and leap years — not 30-day approximations — so results match how durations are counted legally and officially.

How to Use the Date Difference Calculator

  1. Pick the first date.
  2. Pick the second date — order doesn't matter.
  3. Read the difference in years/months/days plus total months, weeks, days and hours.

Features

  • Exact calendar breakdown: years, months, days
  • Totals in months, weeks, days and hours
  • Order-independent — no negative results
  • Correct leap-year handling

Frequently Asked Questions

Does it count both the start and end dates?

It counts the elapsed time between the two dates — from date A to date B. So Jan 1 to Jan 2 is 1 day. Add 1 yourself if you need an inclusive day count.

How are months counted when lengths differ?

Whole calendar months are counted first (Jan 31 → Feb 28 counts as one month in a non-leap year), then remaining days — the same convention used for ages and legal durations.

Is the Date Difference Calculator free?

Yes, the Date Difference Calculator is completely free with no usage limits. No signup, no account and no installation required.

Does the Date Difference Calculator work on mobile?

Yes. The Date Difference Calculator is fully responsive and works in any modern browser on phones, tablets and desktops.

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