Python 内置了 datetime 模块来处理常见的时间操作，简单易用又功能强大！ 今天 Crossin 将带你快速上手 datetime，通过案例让你轻松掌握时间处理技巧。 1.

If you want to do time-of-day arthithmetic, the easiest thing to do is start with a datetime.datetime object with dummy values of year, month, and day, and add datetime.timedelta objects to it: ...