Date Calculator
Days between two dates (incl. business days), or add and subtract days, weeks, months.
How to use Date Calculator
- Choose "Between dates" or "Add or subtract".
- Enter the dates or the amounts to add.
- Read the result, including business days for date ranges.
How it works
Days between dates counts calendar days from the start date up to (but not including) the end date, like counting nights. Turn on "Include the end date" to count both ends, as when counting days of a trip or a leave period. Business days count Monday to Friday and do not know public holidays, which differ by country.
Adding months keeps the day of the month where possible and clamps to the month’s end otherwise: 31 January + 1 month = 28 February (29 in leap years). Years are added the same way.
Example
From 9 November 2026 to 25 December 2026 is 46 days (6 weeks and 4 days), of which 34 are weekdays.
Frequently asked questions
Does it count the start date?
The start date is counted and the end date is not, unless you tick "Include the end date".
Are public holidays excluded from business days?
No. Only Saturdays and Sundays are excluded; subtract your local holidays separately.
How are leap years handled?
Correctly: calculations use real calendar dates, including 29 February.
What is 90 days from today?
Choose "Add or subtract", keep today’s date as the start and enter 90 days.
Limitations
- Business days ignore public holidays.
- Gregorian calendar only.
Last reviewed November 9, 2026. How we build and test tools.