What if I pick the To date before the From date?

The tool automatically swaps them so the difference is always shown as a positive value.

Does it account for leap years and different month lengths?

Yes — the calculation is calendar-aware, so it correctly handles February and varying month lengths rather than assuming a flat 30-day month.

The first is a calendar breakdown (e.g. "2 years, 1 month, 3 days"); "total days" is the same gap expressed as one flat number.

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

From date

To date

26 years, 9 months, 25 days

9795 total days · 1399 weeks · 321 months

1
Pick a From date and To date

Use the two date pickers.
2
See the calendar-aware difference

Years, months and days between the two dates are shown as one line.
3
Check the flat totals

Total days, weeks and months are shown below, useful for scheduling or billing.

What if I pick the To date before the From date?: The tool automatically swaps them so the difference is always shown as a positive value.
Does it account for leap years and different month lengths?: Yes — the calculation is calendar-aware, so it correctly handles February and varying month lengths rather than assuming a flat 30-day month.
What is the difference between the years/months/days figure and the total days?: The first is a calendar breakdown (e.g. "2 years, 1 month, 3 days"); "total days" is the same gap expressed as one flat number.