Date Calculator
Calculate the number of days between two dates, or add and subtract days, weeks and months from a date. Business day mode included. Free.
Days between two dates
30
days
- Days
- 30
- Business days
- 22
- Weekend days
- 8
- Weeks
- 4.29
- Months
- 0
- Years
- 0.00
- Hours
- 720
Add or subtract from a date
Friday, 28 August 2026
2026-08-28
What this tool is for
Two calculations that come up constantly: how long between these dates, and what date is N days from this one. Business day mode skips weekends, which is what deadlines, notice periods and delivery estimates are usually counted in.
How to use it
- To measure a gap, set both dates and read the result in days, weeks, months and years.
- To shift a date, set the start and the amount to add or subtract.
- Turn on business days to skip Saturdays and Sundays.
Frequently asked questions
Is the end date included?
The difference is exclusive by default, so 1 March to 2 March is one day. There is a toggle to count both endpoints, which is how contract periods are usually expressed.
How are months counted?
By calendar, not by a fixed 30 days. Adding one month to 31 January gives 28 or 29 February, since there is no 31st.