Add Years

What Add Years does

Adds or subtracts years, clamps Feb 29 when needed, and names the weekday. Unlike Add Months this is year-sized. Invalid dates fail.

Practical limit for Add Years: Clamps leap-day when needed. English short weekday. That is why output can differ from heavy desktop Date & time software. Read the tool-specific note again: Adds or subtracts years, clamps Feb 29 when needed, and names the weekday. Unlike Add Months this is year-sized. Invalid dates fail.

How to use Add Years

1. Confirm you need Add Years, not Add Months (Add months; shows result weekday.). Address: /datetime/add-years.
2. Enter the numbers or dates Add Years uses. Add years; shows result weekday.
3. Read the result as Add Years defines it — not as Add Days (Add calendar days; shows result weekday.). Adds or subtracts years, clamps Feb 29 when needed, and names the weekday. Unlike Add Months this is year-sized. Invalid dates fail.
4. Add Years is an estimate in the browser, not professional advice. Clamps leap-day when needed. English short weekday.
5. Need a different formula? Try Add Days (Add calendar days; shows result weekday.) instead of stretching Add Years.

When not to use Add Years

Skip Add Years when a neighbor tool matches better — start with Add Months or Add Days — or when the description already warns the job will fail. In the tool’s own words: Adds or subtracts years, clamps Feb 29 when needed, and names the weekday. Unlike Add Months this is year-sized. Invalid dates fail.

Questions about Add Years

What does Add Years do that other Date & time pages on this site do not?

Adds or subtracts years, clamps Feb 29 when needed, and names the weekday. Unlike Add Months this is year-sized. Invalid dates fail. Short version: Add years; shows result weekday.

Does Add Years upload my file or text to Tool-You servers?

No. Add Years runs in this browser tab. Files stay on the device. Limit note: Clamps leap-day when needed. English short weekday.

Should I use Add Months instead of Add Years?

Use Add Years when you need Add years; shows result weekday. Use Add Months when you need Add months; shows result weekday. They share a category (Date & time) but not the same job.

What are the limits of Add Years?

Clamps leap-day when needed. English short weekday. Also: Adds or subtracts years, clamps Feb 29 when needed, and names the weekday. Unlike Add Months this is year-sized. Invalid dates fail.