Add / Subtract Days Calculator
Add or subtract any number of days from a starting date.
Calculate
Enter your values below.
Result
Resulting date
0
Formula used
The number of days is added directly to the calendar date, correctly rolling over months and years.
Example: 15 Jan 2024 + 30 days = 14 Feb 2024.
How to use this calculator
- Enter Starting date, Days to add (use negative to subtract).
- Press Calculate to see your result instantly.
FAQ
Frequently asked questions
How do I subtract days instead?
Enter a negative number, e.g. -30.
Does this handle month-end rollovers correctly?
Yes, it correctly rolls into the next month or year as needed.
Does this account for leap years?
Yes, real calendar dates are used throughout.
Can I add years' worth of days at once?
Yes, there's no limit on how many days you can add or subtract.