用STC最小系统的实时时钟设计实现数字钟。

可以切换年月日时分秒显示，支持时钟设计功能 用Keil C51编程实现上述功能 用Keil与Proteus联调.

-With minimum on STC system real time clock design for digital clock.

Can switch when (date) (month) (year), according to minutes support clock design functions　Use Keil C51 programming to achieve the above functions　Use with Proteus Keil alignment.