UTILITIES / FREE ONLINE TOOL
Add or Subtract Dates
Move a date forward or back by days, weeks, or months.
Free to use On-device processing No account needed
Your workspace Runs privately in your browser
Your result
A little guidance.
Add or subtract a whole number of days, weeks, months, or years from a calendar date. Negative amounts move backward. Month and year changes clamp to the last valid day when necessary.
How it works
- Enter your values, or use the example to get started.
- Select “Calculate date” to process your input in your browser.
- Review the result, then copy or download it when available.
Good to know.
What happens to January 31 plus one month?
It becomes the last valid day in February. Calendar dates use UTC arithmetic and support years 0001–9999.
Is my input sent to a server?
No. This tool runs in your browser. KILIZU does not upload or store the values or files you enter here.