51单片机电子日历（电子时钟）程序 硬件实验箱是伟福LAB2000实验箱 电子日历，有时间显示、闹铃、日期、秒表及键盘设置功能-51 Single-chip electronic calendar [electronic clock] procedure experimental boxes are hardware-wei Fu LAB2000 experimental boxes of electronic calenda