This app can be used for many purposes. However, one of the most common uses is for calculating the difference between two dates. This can be done in various ways, but the most common method is to subtract the date that is one day earlier.

The difference can be calculated in various ways, depending on the requirements. For example, if you want to calculate the difference between today and tomorrow, you can simply use the "Today" and "Tomorrow" buttons.

Another method is to calculate the difference between the dates using the calendar. This can be done in various ways, depending on the requirement.