程序代码：

namespace CMD_Demo
{
    class Program
    {
        static void Main(string[] args)
        {
            string nowtime1 = System.DateTime.Now.ToString();
            string nowtime1info = "长格式的时间显示：";
            string nowtime2 = System.DateTime.Now.ToShortDateString();
            string nowtime2info = "短格式的时间显示：";
            Console.Write(nowtime1info);
            Console.WriteLine(nowtime1);
            Console.Write(nowtime2info);
            Console.WriteLine(nowtime2);
            Console.ReadLine();
        }
    }
}