Add or subtract days, weeks, months or years from any date.
Calculated instantly in your browser.
How do you add or subtract days from a date?
A date calculator adds or subtracts a span of days, weeks, months or years from a starting date and shows the resulting date and weekday. Month and year steps account for different month lengths, so adding one month to 31 January lands on the correct end-of-month date. For example, 90 days after 21 June 2026 is 19 September 2026.
Understanding your result
Month and year steps account for different month lengths, so adding one month to 31 January lands on the correct end-of-month date.
Worked example
90 days after 21 June 2026 is 19 September 2026.
How to use this tool
- Pick a start date.
- Choose add or subtract, an amount and a unit.
- Press Calculate.
About the Date Calculator (Add / Subtract)
The Date Calculator adds or subtracts a span of days, weeks, months or years from a starting date and shows the resulting date and weekday.
Explore all Date and Time tools
Frequently asked questions
Does it handle leap years?
Yes. Adding days, months or years uses the calendar, so leap years and varying month lengths are handled automatically.