Date Duration Calculator
Count the days, weeks, months and working days between two dates, and find the date a number of days from now.
Count the days, weeks, months and working days between two dates, or add a period to a date.
Duration
Pick a start and end date.
Generating...About the date duration calculator
Counting days between dates by hand goes wrong at month boundaries and in February. Working days are worse, because you have to skip weekends across an arbitrary span.
The calendar breakdown here counts real months rather than dividing by an average, so 31 January to 28 February is one month rather than 0.96 of one.
How to use it
- 1Pick the start and end dates.
- 2Decide whether the end date counts as a full day.
- 3Read the total days, calendar breakdown and working days.
- 4Use the add days field to project forward from the start.
Questions
Should I include the end date?
It depends what you are counting. For a hotel stay, no: checking in Monday and out Wednesday is two nights. For a project running Monday to Wednesday inclusive, yes: that is three days.
Are public holidays excluded from working days?
No. Holidays differ by country and region, so only weekends are excluded. Subtract your own holidays from the result.
How are months counted?
By the calendar, not by an average length. The remaining days borrow from the length of the month before the end date, which is how date libraries do it.
Does it handle leap years?
Yes, the browser's own date handling covers leap years and month lengths correctly.