//引入命名空间
using System;
using System.Globalization;

public class SamplesCultureInfo  {

   public static void Main()  {

      // Gets the calendars supported by the ar-SA culture.
      Calendar[] myOptCals = new CultureInfo("ar-SA").OptionalCalendars;

      // Checks which ones are GregorianCalendar then determines the GregorianCalendar version.
      Console.WriteLine( "The ar-SA culture supports the following calendars:" );
      foreach ( Calendar cal in myOptCals )  {
         if ( cal.GetType() == typeof( GregorianCalendar ) )  {
            GregorianCalendar myGreCal = (GregorianCalendar) cal;
            GregorianCalendarTypes calType = myGreCal.CalendarType;
            Console.WriteLine( "   {0} ({1})", cal, calType );
         }
         else  {
            Console.WriteLine( "   {0}", cal );
         }
      }
   }
}

//引入命名空间
using System;
using System.Globalization;

public class SamplesGregorianCalendar  {

   public static void Main()  {

      // Creates and initializes four different CultureInfo objects.
      CultureInfo myCIdeDE = new CultureInfo("de-DE", false);
      CultureInfo myCIenUS = new CultureInfo("en-US", false);
      CultureInfo myCIfrFR = new CultureInfo("fr-FR", false);
      CultureInfo myCIruRU = new CultureInfo("ru-RU", false);

      // Creates a Localized GregorianCalendar.
      // GregorianCalendarTypes.Localized is the default when using the GregorianCalendar constructor without parameters.
      Calendar myCal = new GregorianCalendar();

      // Sets the DateTimeFormatInfo.Calendar property to a Localized GregorianCalendar.
      // Localized GregorianCalendar is the default calendar for de-DE, en-US, and fr-FR,
      myCIruRU.DateTimeFormat.Calendar = myCal;

      // Creates a DateTime.
      DateTime myDT = new DateTime( 2002, 1, 3, 13, 30, 45 );

      // Displays the DateTime.
      Console.WriteLine( "de-DE: {0}", myDT.ToString( "F", myCIdeDE ) );
      Console.WriteLine( "en-US: {0}", myDT.ToString( "F", myCIenUS ) );
      Console.WriteLine( "fr-FR: {0}", myDT.ToString( "F", myCIfrFR ) );
      Console.WriteLine( "ru-RU: {0}", myDT.ToString( "F", myCIruRU ) );
   }
}