Add Days Calculator
Add or subtract any number of days from a date to find future or past calendar dates instantly.
What Is an Add Days Calculator?
An add days calculator lets you add or subtract any number of calendar days from a start date. Enter 7 for one week, 30 for about a month, 120 for a long trial, or any custom value. It is the flexible version of fixed day-count tools like the 30, 60, 90, or 180 day calculators.
How to Use It
- Enter your start date.
- Set the number of days to add or subtract.
- Choose add or subtract.
- Optionally include the start date in the count.
Example
Starting March 1, 2024 and adding 120 days gives June 29, 2024. Subtracting 14 days from April 15, 2024 gives April 1, 2024.
For preset spans, try the 30 Day Calculator, 120 Day Calculator, or Number of Days tool to count days between two dates.
Frequently Asked Questions
Can I subtract days instead of adding them?
Yes. Choose "Subtract days" to find a date in the past relative to your start date.
What does "include start date" mean?
When checked, the start date counts as day 1, so the result is one day earlier than the default behavior.
Is there a limit on the number of days?
You can enter any non-negative whole number. Very large values work across multiple years and leap years.
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