万年历(闹钟时分1602)

代码说明：

  基于51单片机设计的万年历，采用LCD1602实现时间的显示（年月日时分秒）时间以及闹钟的设置(Based on the calendar designed by 51 single chip computer, LCD1602 is used to realize the display of time (year, month, day, hour, second) and the setting of alarm clock.)