Date Calculator
Add or subtract days, weeks, months, or years from a date.
Free · No sign-up · Works in your browser
About the Date Calculator
Add or subtract time from a date, free — pick a start date, choose add or subtract, and enter a number of days, weeks, months, or years to get the exact resulting date and the day of the week it lands on. Perfect for deadlines and due dates, contract and notice periods, warranty and return windows, and “what date is 90 days from today?” questions. Leap years and month lengths are handled automatically.
How to use the Date Calculator
- 1Pick a start date.
- 2Choose add or subtract, and enter an amount and unit.
- 3Read the resulting date and weekday.
Frequently asked questions
What date is 90 days from today?
Set the start date to today, choose Add, enter 90 days, and the result — with the weekday — appears instantly.
Does it handle months and leap years?
Yes — adding months and years uses real calendar rules, and February 29 in leap years is handled correctly.
How is this different from the date difference calculator?
This one adds or subtracts a length of time from a date to find a new date; the date difference calculator measures the gap between two dates you already know.