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Date Difference

Pick two dates to see how far apart they are — in years, months and days, plus the total days, weeks and weekdays between them.

Result

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Weekdays exclude Saturday and Sunday. Public holidays vary by country and are not deducted.

How the difference is measured

There are two honest ways to answer "how far apart are these dates", and this tool gives both. The headline result is a calendar span: complete years, then complete months, then the days left over. The totals below it are raw counts, which is what you want for a deadline or an invoice.

The two disagree in a way that surprises people. From 31 January to 1 March is one month and one day, but also 29 days in a common year. Neither is wrong — a month is not a fixed number of days, and the calendar span rounds to the anniversary date with the day clamped to the length of the target month.

Frequently asked questions

Does the count include the start and end dates?

Total days counts the gap between the two dates, so 1 January to 2 January is one day. The weekday count is inclusive of both ends, because that is how people count working days on a calendar.

Why are weekdays not called business days?

Public holidays differ by country, state and sometimes city. Calling this a business day count would give a confident answer that is wrong for most readers. It excludes Saturday and Sunday only, which is true everywhere.

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

The result is the same magnitude either way. The tool measures the distance between two dates, so swapping them changes nothing.

Are leap years handled?

Yes. The full Gregorian rule applies, so 2000 is a leap year and 1900 is not. A range crossing 29 February counts that extra day.

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