Date and duration calculator
To count the days between two dates, enter the start date and the end date: the calculator gives the number of days, weeks, months and business days, instantly.
Choose a calculation: the gap between two dates (in days, weeks, months and business days), a date plus or minus a duration, or the time between two hours. The result appears as you type, and the link keeps the calculation to share it.
Frequently asked questions
Is the end date counted?
By default, the gap counts from the start date to the end date, like most calculators: from Monday to Wednesday is 2 days. Tick “Count the end date” to include it.
How are business days counted?
Business days are Monday to Friday. Saturdays and Sundays are skipped, both to count a gap and to add a number of business days to a date.
How do you add a month to January 31?
The result stays in the target month: January 31 plus one month gives the last day of February, the 28th or the 29th in a leap year.
Are public holidays taken into account?
No: public holidays differ by country, region and year, and we only use official sources. Remove them yourself from the number of business days.