How to use this calculator
Move a date forward or backward by calendar parts.
How the calculation works
- Enter a starting date.
- Choose add or subtract.
- Set years, months, weeks, and days.
Example
Add 1 month to January 31 and get the last valid day in February.
Understanding your result
Use the output as a practical starting point, then review it before using it in an important workflow.
Assumptions and limitations
- Month-end dates clamp to the target month’s last valid day.
- Weeks are applied as seven-day blocks.
Frequently asked questions
Does this require an account?
No. The core tool works without creating a Tool2Do account.
Is my input included in share links or analytics?
No. Tool2Do share actions use the tool page URL and safe metadata, not private values or uploaded files.