时间计算器-

这个计算器的设计是为了帮助你做出小时和分钟计算和减法方便，快捷无需进入复杂的转换。

This calculator has been designed to help you make calculations and subtractions of hours and minutes easily and quickly without going into complicated conversions.

It allows you to see your calculations as you tape them, and keep them in memory, even after shutting down the app.

You’ll also be able to go up to hundred of thousands of hours.