Date & time calculator
Standalone tool pageAdd or Subtract Days Calculator
Add or subtract days, weeks, months, and years from any date.
Result
Result date
—
Day of week
—
How It Works
The calculator starts from your selected date and applies years, months, weeks, and days in the selected direction.
Example
Starting from 2026-01-01, adding 30 days gives 2026-01-31.
Frequently Asked Questions
Can I subtract days too?
Yes. Choose subtract mode to move backward from the starting date.
Does it support weeks, months, and years?
Yes. You can add or subtract days, weeks, months, and years in one calculation.