How to Add or Subtract Days, Months or Years from a Date

To add or subtract time from a date, enter the start date, choose add or subtract and enter days, months or years in the Date Add/Subtract Calculator. It returns the resulting date.

Follow along with the free Date Add/Subtract Calculator, which runs in your browser, or browse more tools in this category.

How to use the Date Add/Subtract Calculator

1. Enter the start date.
2. Choose add or subtract.
3. Enter the number of days, months or years.
4. Read the resulting date.

Worked example

Adding 90 days to 1 January 2026 gives 1 April 2026.

Tips and common mistakes

• Adding a month to 31 January lands on the last day of February.
• Use it to find due dates, expiry dates and follow-up dates.
• Weekends are not skipped.

Frequently asked questions