Date Calculator
Calculate future or past dates by adding or subtracting days, weeks, or months.
Add or subtract days from a date.
How to use
- Select a starting date.
- Enter the number of days, weeks, or months to add or subtract.
- Choose add or subtract mode.
- View the resulting date on screen.
About Date Calculator
Add or subtract days from a date.
Runs in your browser — your files and input stay on your device.
Frequently asked questions
Are leap years handled?
Yes. Standard calendar rules apply.
Is data stored?
No.
Can I calculate past dates?
Yes. Subtract days to go backward in time.