应用信息服务程序使程序可以去访问某些系统保存的信息，例如时间、日期及操作员标识。
Application information give a program access to certain types of system-maintained information, such as the time, data and operator (ID).
利用AT 89s51单片机及实时时钟集成电路ds1643，设计了一个电子钟系统，实现了日期、时间显示及报时功能。
Use AT89S51 single chip and real-time clock integrated circuit DS1643, designed an electronic clock system, realized the date, time display and reported time.
利用AT 89s51单片机及实时时钟集成电路ds1643，设计了一个电子钟系统，实现了日期、时间显示及报时功能。
Use AT89S51 single chip and real-time clock integrated circuit DS1643, designed an electronic clock system, realized the date, time display and reported time.
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