Add Days Calculator
Add or subtract days from a start date to compute the exact future or past target calendar date.
Target date
Friday, Sep 18, 2026
2026-09-18iso date•
+30 daysdays offset
Add or subtract a given number of calendar days from any starting date to determine the target date.
Worked Example
- 30 Days from Jan 1, 2026:
Saturday, Jan 31, 2026 - 60 Days from Jan 1, 2026:
Monday, Mar 2, 2026 - 90 Days from Jan 1, 2026:
Wednesday, Apr 1, 2026
Frequently Asked Questions
How do I calculate 30, 60, or 90 days from today?+
Select today's date as the start date, enter 30, 60, or 90 in the number of days field, and choose "Add (+)".
Can I subtract days to find a past date?+
Yes. Change the action dropdown from "Add (+)" to "Subtract (-)" to calculate past dates.
Does this handle leap years?+
Yes. The calendar arithmetic accurately handles leap years (such as February 29) and varying month lengths.
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