Time Calculator is an Android-based application developed by Opena, available for free in the Business & Productivity category. As the name suggests, it is a simple calculator designed specifically for computations on time. The app allows users to perform basic arithmetic operations such as addition, subtraction, multiplication, and division with the sexagesimal system, which is based on the number 60.

The user interface of the app is user-friendly, and it is easy to navigate through the different functions provided. The calculator is particularly useful for those who need to work with time schedules and need to perform quick calculations. The app is also lightweight and does not take up much space on the device, making it a convenient tool to have.