http://brightguo.com/time-calculator/ https://github.com/guoming0000/CalculateTime A qt project to calculate time in any period This app was written by qt, it can calculate time from a start time. You can read the code to learn some qt develop methods. 这个应用是我用qt写的,可以计算某个日子的第n天或者第n分钟等等。你可以阅读源码学习qt