Days between dates
How many days, weeks and months between two dates — and add or subtract days.
Find out exactly how many days lie between two dates, broken down into years, months, weeks and business days (Mon–Fri) — handy for deadlines, contracts, pregnancies and countdowns. On the other tab, add or subtract days from a date to find a due date. Everything is computed in your browser, instantly.
Count the days between two dates
Enter a start and end date and see how many days, weeks and months lie between them — including a business-days count, handy for work and legal deadlines. Use it to figure out contract duration, age in days, time until an event, legal terms and how long until a set date.
Add or subtract days from a date
On the other tab, you start from a date and add or subtract a number of days to find the result — ideal for finding a deadline ("30 days from today"), a delivery date, the end of a warranty or a notice period. The tool handles different month lengths and leap years automatically.
Instant and in the browser
The calculation is immediate and runs on your device, uploading nothing. To calculate financial terms with returns, see the compound interest calculator.
Frequently asked questions
Is the end date included in the count?
The difference is the number of days between the two dates (the start date is day zero). E.g. from Jan 1 to Jan 2 is 1 day. If you need both endpoints included (inclusive count), add 1 to the total.
How are business days counted?
Business days are Monday to Friday, ignoring Saturdays and Sundays. Public or local holidays are not subtracted — they vary by country and year, so the count is of weekdays.
Can I calculate a deadline date?
Yes. On the "Add / subtract days" tab, enter a base date and a number of days (use a negative number to go back in time) — the tool shows the resulting date and which weekday it falls on.