Date Calculator

Calculate the difference between two dates or add/subtract days from a date

Files never leave your deviceNo signup required

Start Date

End Date

Frequently Asked Questions

How do I calculate days between two dates?▼

Enter a start date and end date to instantly see the difference in years, months, weeks, and days.

Can I add or subtract days from a date?▼

Yes - switch to the Add/Subtract tab, enter a date and the number of days to add or subtract, and the calculator will show the resulting date.

Does this account for leap years?▼

Yes, the calculator correctly handles leap years and varying month lengths when computing date differences.

1Open the Date Calculator tool above - it loads instantly in your browser.
2Enter your data or upload your file. Everything is processed locally on your device - nothing is uploaded to any server.
3Get your results instantly. Copy, download, or share - completely free with no signup required.

Date Calculatoris part of BriskTool's collection of free online tools. All tools run entirely in your browser for maximum privacy and speed.