Date Difference Calculator
Count the exact time between two dates in years, months, days, weeks and hours.
Last reviewed July 1, 2026
Need to know exactly how long it is between two dates — for a deadline, an anniversary, a project, or a countdown? This calculator counts the precise gap between any start and end date in years, months and days, plus handy totals in weeks, days and hours.
It handles leap years and different month lengths correctly, so the answer is exact rather than a rough estimate.
How the difference is counted
The calculator counts full years first, then remaining months, then leftover days between the two dates — the natural way to express a duration. The totals (weeks, days, hours) come from the exact number of days between the dates, so leap years are accounted for automatically.
Pick either order for the dates; the calculator always reports a positive duration.
Frequently asked questions
▶How do I count the days between two dates?
Enter a start and end date above and the calculator shows the exact number of days between them, along with the gap in years, months, weeks and hours.
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Open calculator →Disclaimer: Date Difference Calculator results are estimates for general information and education only, and are not financial, tax, legal or medical advice. Verify important decisions with a qualified professional.