What is the Date Calculator?
Add or subtract days, weeks, months and years from a date.
Enter start date, operation, years, months, weeks and days and the Date Calculator returns resulting date, day of the week and days from the start date. Results update as you type, and nothing you enter leaves your device.
How it is calculated
Result = start date ± years, months, weeks and days
How to use it
- Enter start date.
- Choose operation.
- Enter years.
- Enter months.
- Enter weeks.
- Enter days.
- Read resulting date in the results panel. It updates as you type.
- Change any value to compare scenarios, or use Share to send the result as a link.
Worked example
Common questions
What formula does the Date Calculator use?
It uses: Result = start date ± years, months, weeks and days.
What do I need to use the Date Calculator?
You need start date, operation, years, months, weeks and days. Sensible starting values are filled in so you can see how it works straight away.
Is the Date Calculator free, and is my data stored?
It is free with no sign-up. The calculation runs in your browser, so the values you enter are not sent to or stored on our server.