数字时钟，设计一个能显示日期、小时、分钟、秒的数字电子钟，并具有整点报时的功能。

由晶振电路产生1HZ标准的信号。分、秒为六十进制计数器，时为二十四进制计数器。

可手动校正时、分时间和日期值。-Digital clock, designed a show date, hours, minutes, seconds digital electronic clock and hourly chime function. 1HZ standard signal generated by the crystal oscillator circuit. Minutes and seconds to six decimal counter, when, 24 binary counter. Can be manually corrected, the time and date of value.