Add or Subtract Days Calculator
Add or subtract days, weeks, months, years or working days from a date.
Your result will appear here as soon as you add some input.
How to use it
- 1Enter your values in the fields above.
- 2The answer and the working appear immediately below.
- 3Check the working to see the formula with your numbers substituted.
About the Add or Subtract Days Calculator
Adding months is not the same as adding 30 days, and it can land on a different day number: 31 January plus one month is 3 March in a non-leap year, because February has no 31st. The calculator warns when that has happened.
Working-day arithmetic steps over Saturdays and Sundays but knows nothing about public holidays.
Questions people ask
Is your figures uploaded to a server?
No. This tool runs entirely in your browser using standard web APIs, so your figures never leaves your device. You can confirm it by opening your browser's network panel while the tool runs, or by disconnecting from the internet after the page has loaded.
Is it free, and do I need an account?
Yes, it is free, and there is no account, no sign-up and no watermark on the result. The project is funded by optional donations.