[SerializableAttribute]
public struct DateTime : IComparable, IFormattable, 
  IConvertible, ISerializable, IComparable<DateTime>, IEquatable<DateTime>

static void Main(string[] args)
    {
      DateTime newChina = new DateTime(1949, 10, 1);
      Console.WriteLine(newChina);
      Console.WriteLine("当前时间：");
      Console.WriteLine("{0}年，{1}月，{2}日",DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day);
      Console.WriteLine("{0}时，{1}分, {2}秒",DateTime.Now.Hour, DateTime.Now.Minute, DateTime.Now.Second);
      Console.WriteLine("三天后：{0}",DateTime.Now.AddDays(3));
      Console.ReadLine();
    }

Console.WriteLine(DateTime.Now.ToString("yyyy-MM-dd"));
  Console.WriteLine(DateTime.Now.ToString("hh:mm:ss"));

static void Main(string[] args)
    {
      CultureInfo jaJP = new CultureInfo("ja-JP");
      jaJP.DateTimeFormat.Calendar = new JapaneseCalendar();
      DateTime date1 = new DateTime(1867, 1, 1);
      DateTime date2 = new DateTime(1967, 1, 1);
      
      try
      {
        Console.WriteLine(date2.ToString(jaJP));
        Console.WriteLine(date1.ToString(jaJP));
      }
      catch (ArgumentOutOfRangeException)
      {
        Console.WriteLine("{0:d} is earlier than {1:d} or later than {2:d}",
                 date1,
                 jaJP.DateTimeFormat.Calendar.MinSupportedDateTime,
                 jaJP.DateTimeFormat.Calendar.MaxSupportedDateTime);
      }
      Console.ReadLine();
    }

static void Main(string[] args)
    {
      Console.WriteLine("2000年至2015年中二月的天数");
      for (int i = 2000; i < 2015; i++)
      {
        Console.WriteLine("{0}年2月有：{1}天", i, DateTime.DaysInMonth(i, 2));
      }
      Console.ReadLine();
    }

static void Main(string[] args)
    {
      Console.WriteLine("2000年至2015年中二月的天数");
      for (int i = 2000; i < 2015; i++)
      {
        if (DateTime.IsLeapYear(i))
          Console.WriteLine("{0}年是闰年，2月有{1}天", i, DateTime.DaysInMonth(i, 2));
        else
          Console.WriteLine("{0}年是平年，2月有{1}天",i,DateTime.DaysInMonth(i,2));
      }
      Console.ReadLine();
    }

   // Checks whether a given year is a leap year. This method returns true if
    // year is a leap year, or false if not.
    //
    public static bool IsLeapYear(int year) {
      if (year < 1 || year > 9999) {
        throw new ArgumentOutOfRangeException("year", Environment.GetResourceString("ArgumentOutOfRange_Year"));
      }
      Contract.EndContractBlock();
      return year % 4 == 0 && (year % 100 != 0 || year % 400 == 0);
    }