设计一个数字钟，本设计要求一个12进制或24进制的具有时、分、秒计时功能的数字钟，并能进行时和分的调整。-Design a digital clock, this design requires a 12 or 24 hexadecimal hexadecimal have the hours, minutes, seconds, chronograph function digital clock, and can be adjusted hours and minutes.