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C# datetime 輸出格式

https://docs.microsoft.com/zh-cn/dotnet/api/system.datetime.tostring?view=netframework-4.8#System_DateTime_ToString_System_IFormatProvider_
https://www.cnblogs.com/polk6/p/5465088.html

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using System;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      // Create an array of all supported standard date and time format specifiers.
      string[] formats = {"d","D","f","F","g","G","m","o","r","s","t","T","u","U","Y"};
      // Create an array of four cultures.                                 
      CultureInfo[] cultures = {CultureInfo.CreateSpecificCulture("de-DE"),CultureInfo.CreateSpecificCulture("en-US"),CultureInfo.CreateSpecificCulture("es-ES"),CultureInfo.CreateSpecificCulture("fr-FR")};
       // Define date to be displayed.
      DateTime dateToDisplay = new DateTime(2008,10,1,17,4,32);

      // Iterate each standard format specifier.
      foreach (string formatSpecifier in formats)
      {
         foreach (CultureInfo culture in cultures)
            Console.WriteLine("{0} Format Specifier {1,10} Culture {2,40}",formatSpecifier,culture.Name,dateToDisplay.ToString(formatSpecifier,culture));
         Console.WriteLine();
      }   
   }
}
// The example displays the following output:
//    d Format Specifier      de-DE Culture                               01.10.2008
//    d Format Specifier      en-US Culture                                10/1/2008
//    d Format Specifier      es-ES Culture                               01/10/2008
//    d Format Specifier      fr-FR Culture                               01/10/2008
//    
//    D Format Specifier      de-DE Culture                Mittwoch,1. Oktober 2008
//    D Format Specifier      en-US Culture              Wednesday,October 01,2008
//    D Format Specifier      es-ES Culture         miércoles,01 de octubre de 2008
//    D Format Specifier      fr-FR Culture                  mercredi 1 octobre 2008
//    
//    f Format Specifier      de-DE Culture          Mittwoch,1. Oktober 2008 17:04
//    f Format Specifier      en-US Culture      Wednesday,2008 5:04 PM
//    f Format Specifier      es-ES Culture   miércoles,01 de octubre de 2008 17:04
//    f Format Specifier      fr-FR Culture            mercredi 1 octobre 2008 17:04
//    
//    F Format Specifier      de-DE Culture       Mittwoch,1. Oktober 2008 17:04:32
//    F Format Specifier      en-US Culture   Wednesday,2008 5:04:32 PM
//    F Format Specifier      es-ES Culture miércoles,01 de octubre de 2008 17:04:3
//    F Format Specifier      fr-FR Culture         mercredi 1 octobre 2008 17:04:32
//    
//    g Format Specifier      de-DE Culture                         01.10.2008 17:04
//    g Format Specifier      en-US Culture                        10/1/2008 5:04 PM
//    g Format Specifier      es-ES Culture                         01/10/2008 17:04
//    g Format Specifier      fr-FR Culture                         01/10/2008 17:04
//    
//    G Format Specifier      de-DE Culture                      01.10.2008 17:04:32
//    G Format Specifier      en-US Culture                     10/1/2008 5:04:32 PM
//    G Format Specifier      es-ES Culture                      01/10/2008 17:04:32
//    G Format Specifier      fr-FR Culture                      01/10/2008 17:04:32
//    
//    m Format Specifier      de-DE Culture                               01 Oktober
//    m Format Specifier      en-US Culture                               October 01
//    m Format Specifier      es-ES Culture                               01 octubre
//    m Format Specifier      fr-FR Culture                                1 octobre
//    
//    o Format Specifier      de-DE Culture              2008-10-01T17:04:32.0000000
//    o Format Specifier      en-US Culture              2008-10-01T17:04:32.0000000
//    o Format Specifier      es-ES Culture              2008-10-01T17:04:32.0000000
//    o Format Specifier      fr-FR Culture              2008-10-01T17:04:32.0000000
//    
//    r Format Specifier      de-DE Culture            Wed,01 Oct 2008 17:04:32 GMT
//    r Format Specifier      en-US Culture            Wed,01 Oct 2008 17:04:32 GMT
//    r Format Specifier      es-ES Culture            Wed,01 Oct 2008 17:04:32 GMT
//    r Format Specifier      fr-FR Culture            Wed,01 Oct 2008 17:04:32 GMT
//    
//    s Format Specifier      de-DE Culture                      2008-10-01T17:04:32
//    s Format Specifier      en-US Culture                      2008-10-01T17:04:32
//    s Format Specifier      es-ES Culture                      2008-10-01T17:04:32
//    s Format Specifier      fr-FR Culture                      2008-10-01T17:04:32
//    
//    t Format Specifier      de-DE Culture                                    17:04
//    t Format Specifier      en-US Culture                                  5:04 PM
//    t Format Specifier      es-ES Culture                                    17:04
//    t Format Specifier      fr-FR Culture                                    17:04
//    
//    T Format Specifier      de-DE Culture                                 17:04:32
//    T Format Specifier      en-US Culture                               5:04:32 PM
//    T Format Specifier      es-ES Culture                                 17:04:32
//    T Format Specifier      fr-FR Culture                                 17:04:32
//    
//    u Format Specifier      de-DE Culture                     2008-10-01 17:04:32Z
//    u Format Specifier      en-US Culture                     2008-10-01 17:04:32Z
//    u Format Specifier      es-ES Culture                     2008-10-01 17:04:32Z
//    u Format Specifier      fr-FR Culture                     2008-10-01 17:04:32Z
//    
//    U Format Specifier      de-DE Culture     Donnerstag,2. Oktober 2008 00:04:32
//    U Format Specifier      en-US Culture   Thursday,October 02,2008 12:04:32 AM
//    U Format Specifier      es-ES Culture    jueves,02 de octubre de 2008 0:04:32
//    U Format Specifier      fr-FR Culture            jeudi 2 octobre 2008 00:04:32
//    
//    Y Format Specifier      de-DE Culture                             Oktober 2008
//    Y Format Specifier      en-US Culture                            October,2008
//    Y Format Specifier      es-ES Culture                          octubre de 2008
//    Y Format Specifier      fr-FR Culture                             octobre 2008