Add or Subtract Days From a Date
Pick a start date and a number of days to add or subtract. The calculator returns the exact resulting date along with the day of the week, using UTC so time zones never shift the answer.
How to add or subtract days from a date
- Choose your start date.
- Enter the number of days to add, or a negative number to subtract.
- Read the resulting date and its day of the week.
Examples
Add 30 days
Start 2026-06-11, add 30 days
2026-07-11 (Saturday)
Subtract 11 days
Start 2026-06-11, add -11 days
2026-05-31 (Sunday)
Frequently asked questions
How do I subtract days instead of adding them?
Enter a negative number of days. For example, -11 moves the date eleven days earlier. The calculator handles month and year boundaries automatically.
Does it count leap days?
Yes. The calculator uses real calendar dates, so February 29 in a leap year is included. Adding one day to February 28, 2024 returns February 29, 2024.
Why does the result show a day of the week?
Knowing the weekday is often the point of the calculation, such as checking whether a deadline lands on a weekend. The weekday is derived directly from the resulting date.
Will time zones change the answer?
No. All of the math runs in UTC and treats each date as a plain calendar date, so daylight saving time and time zones never shift the result.
Is my data sent anywhere?
No. The calculation runs entirely in your browser, and the dates you enter never leave your device.
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