This class defines how DateTime values are formatted for a culture. Several standard patterns are defined with the default property values. These standard patterns are designated by a format character. The format character provides a shortcut to specify the format of a DateTime with the ToString( ) method. You can create custom formats using a set of format pattern characters. These characters represent different styles of day and time representations and allow you to build customized pattern strings. To create custom patterns, first you need to construct a writable instance of DateTimeFormatInfo by using its constructor. Use InvariantInfo to fetch a culture-independent, read-only instance of this class.

public sealed class DateTimeFormatInfo : ICloneable, IFormatProvider {
// Public Constructors
   public DateTimeFormatInfo( );
// Public Static Properties
   public static DateTimeFormatInfo CurrentInfo{get; }
   public static DateTimeFormatInfo InvariantInfo{get; }
// Public Instance Properties
   public string[ ] AbbreviatedDayNames{set; get; }
   public string[ ] AbbreviatedMonthNames{set; get; }
   public string AMDesignator{set; get; }
   public Calendar Calendar{set; get; }
   public CalendarWeekRule CalendarWeekRule{set; get; }
   public string DateSeparator{set; get; }
   public string[ ] DayNames{set; get; }
   public DayOfWeek FirstDayOfWeek{set; get; }
   public string FullDateTimePattern{set; get; }
   public bool IsReadOnly{get; }
   public string LongDatePattern{set; get; }
   public string LongTimePattern{set; get; }
   public string MonthDayPattern{set; get; }
   public string[ ] MonthNames{set; get; }
   public string PMDesignator{set; get; }
   public string RFC1123Pattern{get; }
   public string ShortDatePattern{set; get; }
   public string ShortTimePattern{set; get; }
   public string SortableDateTimePattern{get; }
   public string TimeSeparator{set; get; }
   public string UniversalSortableDateTimePattern{get; }
   public string YearMonthPattern{set; get; }
// Public Static Methods
   public static DateTimeFormatInfo GetInstance(IFormatProvider provider);
   public static DateTimeFormatInfo ReadOnly(DateTimeFormatInfo dtfi);
// Public Instance Methods
   public object Clone( ); 
// implements ICloneable
   public string GetAbbreviatedDayName(DayOfWeek dayofweek);
   public string GetAbbreviatedEraName(int era);
   public string GetAbbreviatedMonthName(int month);
   public string[ ] GetAllDateTimePatterns( );
   public string[ ] GetAllDateTimePatterns(char format);
   public string GetDayName(DayOfWeek dayofweek);
   public int GetEra(string eraName);
   public string GetEraName(int era);
   public object GetFormat(Type formatType);         
// implements IFormatProvider
   public string GetMonthName(int month);
}

Returned By

CultureInfo.DateTimeFormat

Passed To

CultureInfo.DateTimeFormat