程序模块化设计，各部分代码请查看头文件（***.h）内容。



按键s1选模式，按键s2加，按键s3减，s4不用，调整顺序：秒，时，分，日，月，年，星期。



按s1一次，秒时间停住不动，此时按s2或s3调整秒，



再按s1，按s2或s3调整分。。。。。以此类推



对显示内容不满意请到头文件key.h中自行修改-Program modular design, each part of the code please see the header file (***. H) content. Key s1 selection mode, the button s2 plus, minus buttons s3, s4 not, adjust the order: seconds, hours, minutes, day, month, year, week. By s1 once, second time freezes, this time by s2 or s3 adjust seconds, then s1, s2 or s3 by adjusting. . . . . So go on display are not satisfied with the modify the header file key.h