Date Calculator
Calculate the duration between two dates or add/subtract days from a date.
Frequently asked questions
How many days are between two dates?
Pick a start and end date and the calculator shows the duration in days right away. You can also add or subtract days from a date.
Popular uses
How does this tool work?
Tool for time calculations, from the duration between appointments to deadline calculations.
In 'Calculate Duration' mode, you determine the exact distance between two dates in days, weeks, months, and years. The 'Date Add/Subtract' mode, on the other hand, allows you to add or subtract a specific period of time from a start date to quickly find target dates or deadlines.
Where are my data processed?
Only in your browser. Your data is not sent to any server.
The tool calculates and converts with JavaScript right on your device. Input and files are not sent to us or anyone else. You can check this yourself: load the page, disconnect from the internet, and the tool keeps working in the open tab.