Days Between Two Dates
Choose a start and an end date. The duration shows three ways at once: total days, weeks plus days, and the calendar style years, months and days.
How the Days Are Counted
The default counts the nights between the two dates, so Monday to Friday is 4 days. That matches how you'd count "days until" something.
When to count the end day
Bookings, rentals and medication courses usually include the final date itself: a Monday to Friday hotel stay covers 5 days. Tick the box and one day is added to every figure.
The calendar breakdown
Years, months and days follow the calendar rather than a fixed 30 day month. Whole years advance first, then whole months, then the days that remain, which is the same way ages and anniversaries are stated. Swapped inputs are handled quietly: put the later date first and the tool reverses them for you instead of showing a negative number.
Need hours rather than days? Use hours between two times, or add and subtract time for shifting a clock time by a duration.