The Date Difference Calculator tells you how many days lie between two calendar dates. This is useful for planning deadlines, tracking project timelines, measuring event durations, or simply seeing how long has passed since an important date. Manually counting days or dealing with leap years can be tedious and error prone.

To use this tool you simply select a start date and an end date. The calculator then shows the total number of days between them, and you can interpret the result as needed for your situation. It can be applied to holiday planning, subscription tracking, or personal milestones such as anniversaries.

All computation occurs in your browser using the built-in date functions, and none of the information is stored. The interface is minimal and mobile friendly, making it convenient to check date ranges from any device.