电子产品里要加日历时间功能的话，需要用到RTC这个控制器，该程序就写了一个挑时间和走时的实时时钟，电子工程师需要掌握的东西。-Electronic products in time to add the calendar feature, need to use the RTC this controller, the program wrote a real-time clock pick the time and travel time, electronic engineers need