Date Calculator is a useful application available for Android devices that helps users calculate the duration between two dates, including time. The duration is then broken down into years, months, weeks, days, hours, minutes, and seconds. Users can also calculate a date with reference to another date with a duration. By simply entering a date and a duration and selecting either "plus" or "minus," users can get the result they need.

In addition, the app allows users to calculate working days plus a particular start day, with the option to exclude certain days of the week. The app also provides users with the ability to check out a particular date, including time, with reference to the year, quarter, month, week, day, hour, and minute. With its simple and intuitive design, the app provides a smooth user experience and supports 12-hour and 24-hour time formats.