This is a TimeCalculator.
Anyone can use easily, intuitive by using interface of calculator.

It can register frequently used time. By attaching a name to time, it will be more intuitively.
(Registered the time , it will be displayed by scrolling down .)

It is also have a useful memory function.

It is possible to addtion, subtraction, multiplication, division of hour and minute.

It is available in various uses.
・Man-hour management in business
・Calculation of part time working time
・Creating a time schedule
and more...