实现类似Windows操作系统控制面板“日期和时间”的功能。它显示1980-2099年内某月的日历（含月、日、星期），可以反应闰月情况。并显示当前系统时间。并允许用户重新设置当前计算机系统年月日的时间。并附有程序设计报告。极力推荐。-Similar to the Windows operating system control panel " date and time" . It shows a month during 1980-2099 calendar (including month, day, day of the week), the reaction intercalary month. And displays the current system time. And allows the user to re-set the current time of the computer system date. With program design report. Highly recommended.