Date Calculator (Add/Subtract Days)
Add or subtract days from a date to get a new date.
Saturday, March 14, 2026 + 0 days
Saturday, March 14, 2026
Saturday
ISO Date:2026-03-14
Day of Week:Saturday
How to Do It Manually
To add or subtract days from a date manually, count forward or backward on a calendar. For large numbers, convert months to days (using each month's actual day count) to simplify.
- Start from your chosen date.
- Add or subtract days one month at a time, accounting for each month's length.
- Remember that February has 28 days (29 in leap years).
- The final date after counting is your result.
Frequently Asked Questions
How do I know if a year is a leap year?
A year is a leap year if it is divisible by 4, except century years (e.g. 1900) which must be divisible by 400 (e.g. 2000 is a leap year).
Can I add months or years instead of days?
This tool specifically adds/subtracts days. To add months, count the days in each month you are crossing.