Date to Date Calculator (Duration)

Enter a start date and an end date to calculate the exact duration between two dates. Your results show the difference broken down into years, months, weeks, and days — plus the total count in days, weeks, and months separately. Toggle include end date to count that final day in the result. Also try the Date to Date (with Time) Calculator.

Select the first (earlier) date

Select the second (later) date

Results

Total Days

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Duration (Years, Months, Days)

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Total Weeks

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Total Months

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Years

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Months

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Remaining Days

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Frequently Asked Questions

How does the Date to Date Calculator work?

The calculator finds the difference between your start date and end date by computing the elapsed calendar time. It returns the total number of days, weeks, and months, plus a broken-down result showing years, months, and remaining days. See also our Result — Time (Add/Subtract/Multiply/Divide).

What does 'Include end date' do?

When you check 'Include end date', one extra day is added to the total. This is useful when you want to count both the start and end days — for example, an event that runs from Monday to Friday inclusive is 5 days, not 4.

Can I calculate the duration between dates in different years?

Yes. The calculator handles any two dates regardless of how many years apart they are. It correctly accounts for leap years when computing the total day count and the years/months/days breakdown.

How are leap years handled?

Leap years are fully accounted for. A leap year has 366 days, and the calculator uses actual calendar arithmetic so that February 29 dates are handled correctly when they fall within your selected range. You might also find our 100 Day useful.

What is the difference between 'total months' and the 'months component'?

'Total months' converts the entire duration into months (e.g. 14.5 months). The 'months component' is part of the years-months-days breakdown — for instance, 1 year, 2 months, and 15 days would show 2 in the months component.

Does the calculator work if my end date is before my start date?

The calculator automatically uses the absolute difference between the two dates, so the order you enter them does not matter. The result will always be a positive duration.

How do I calculate how many days until a future event?

Set the start date to today and the end date to the date of your future event. The 'Total Days' result tells you exactly how many days remain. You can also check 'Include end date' if you want to count the event day itself.

How accurate is the days-between-dates calculation?

The calculation is based on standard calendar arithmetic using JavaScript's Date object, which is accurate to the day. All month lengths, leap years, and year boundaries are handled by the underlying calendar system.