Add or subtract days
Find the date before or after a chosen date, including weekends and leap days.
Formula
Result date = start date + signed number of days
Start date = 2026-10-12 · Days to add or subtract = 30
How to use
- Choose a start date.
- Enter positive days to add or negative days to subtract.
- Read the resulting calendar date.
Examples
- 30 days after October 12, 2026 is November 11, 2026.
Frequently asked questions
Is the start date counted?
The start is day zero; adding one gives the following day.
Are weekends excluded?
No. Every calendar day counts.
Can I go backward?
Yes. Use a negative whole number, such as −14.
Sources
Updated: