Does the result include both the start date and the end date?

No, the total is the number of nights between the two dates (endDate − startDate), so the start date itself is not counted as a full day. If you need an inclusive count, add 1 to the total days.

Why don't the months and years figures match total days ÷ 30 or ÷ 365?

The calendar breakdown counts complete years, then complete months in the remainder, then leftover days, so it reflects real calendar month lengths and leap years rather than a fixed average.

Date Difference Calculator

Find the number of days, weeks, months and years between two dates.

How this is calculated

Difference = |endDate − startDate|, in calendar days/weeks/months/years

Assumptions used in this calculation

Calendar: Uses the Gregorian calendar; the end date is treated as exclusive when counting total days elapsed.

About this calculator

The date difference calculator finds the total days, weeks, months and years between any two dates, in either order.

Worked example

1 Jan 2025 to 1 Jan 2026

Result: 365 days

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Frequently asked questions

Does the result include both the start date and the end date?

Why don't the months and years figures match total days ÷ 30 or ÷ 365?

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