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DateTimeFormatInfo.LongDatePattern Property

Gets or sets the custom format string for a long date value.

Namespace:  System.Globalization
Assembly:  mscorlib (in mscorlib.dll)

public string LongDatePattern { get; set; }

Property Value

Type: System.String
The custom format string for a long date value.


The property is being set to null.


The property is being set and the DateTimeFormatInfo object is read-only.

The LongDatePattern property defines the culture-specific format of date strings that are returned by calls to the DateTime.ToString and DateTimeOffset.ToString methods and by composite format strings that are supplied the "D" standard format string. The following example illustrates the relationships among the following: the "D" standard format string, the custom format string returned by the LongDatePattern property, and the culture-specific representation of a date.

using System;
using System.Globalization;

public class Example
   public static void Main()
      DateTime date1 = new DateTime(2001, 11, 12);
      string[] cultureNames = { "en-US", "fr-FR", "ru-RU", "de-DE" };
      Console.WriteLine("{0,-7} {1,-20} {2:D}\n", "Culture", "Long Date Pattern", "Date");
      foreach (var cultureName in cultureNames) {
         CultureInfo culture = CultureInfo.CreateSpecificCulture(cultureName);
         Console.WriteLine("{0,-7} {1,-20} {2}", 
                           date1.ToString("D", culture));                 
// The example displays the following output: 
//    Culture Long Date Pattern    Date 
//    en-US   dddd, MMMM dd, yyyy  Saturday, November 12, 2011 
//    fr-FR   dddd d MMMM yyyy     samedi 12 novembre 2011 
//    ru-RU   d MMMM yyyy 'г.'     12 ноября 2011 г. 
//    de-DE   dddd, d. MMMM yyyy   Samstag, 12. November 2011

See Custom Date and Time Format Strings for individual custom format specifiers that can be combined to construct custom format strings such as "dddd, dd MMMM yyyy".

You should set the date separator in the long date pattern to an exact string instead of using the date separator placeholder. For example, to obtain the pattern MM-DD-yyyy, set the long date pattern to "MM-DD-yyyy".

The value of this property may change if the calendar used by a culture changes. For instance, the following example shows how theLongDatePattern property of a CultureInfo object that represents the Arabic (Syria) culture changes when the Calendar object used by the culture changes.

using System;
using System.Globalization;
using System.IO;

public class Example
   public static void Main()
      DateTime date1 = new DateTime(2011, 8, 7);
      CultureInfo ci = CultureInfo.CreateSpecificCulture("ar-SY");
      StreamWriter sw = new StreamWriter(@".\arSYCalendars.txt"); 

      sw.WriteLine("{0,-32} {1,-21} {2}\n", 
                   "Calendar", "Long Date Pattern", "Example Date");
      foreach (var cal in ci.OptionalCalendars) {
         ci.DateTimeFormat.Calendar = cal;
         sw.WriteLine("{0,-32} {1,-21} {2}", GetCalendarName(cal), 
                                             date1.ToString("D", ci));

   private static string GetCalendarName(Calendar cal)
      string calName;
      calName = cal.GetType().Name.Substring(0, cal.GetType().Name.IndexOf("Cal"));
      if (calName.Equals("Gregorian")) {
         GregorianCalendar grCal = cal as GregorianCalendar;
         calName += String.Format("-{0}", grCal.CalendarType);    
      return calName;
// The example generates the following output: 
//    Calendar                         Long Date Pattern     Example Date 
//    Gregorian-Localized              dd MMMM, yyyy         07 آب, 2011 
//    UmAlQura                         dd/MMMM/yyyy          07/رمضان/1432 
//    Hijri                            dd/MM/yyyy            08/09/1432 
//    Gregorian-USEnglish              dddd, MMMM dd, yyyy   Sunday, August 07, 2011 
//    Gregorian-MiddleEastFrench       dddd, MMMM dd, yyyy   dimanche, août 07, 2011 
//    Gregorian-TransliteratedEnglish  dddd, MMMM dd, yyyy   الأحد, أغسطس 07, 2011 
//    Gregorian-TransliteratedFrench   dddd, MMMM dd, yyyy   الأحد, أوت 07, 2011

The following example displays the value of the LongDatePattern property for a few cultures.

using System;
using System.Globalization;

public class SamplesDTFI  {

   public static void Main()  {

      // Displays the values of the pattern properties.
      Console.WriteLine( " CULTURE    PROPERTY VALUE" );
      PrintPattern( "en-US" );
      PrintPattern( "ja-JP" );
      PrintPattern( "fr-FR" );


   public static void PrintPattern( String myCulture )  {

      DateTimeFormatInfo myDTFI = new CultureInfo( myCulture, false ).DateTimeFormat;
      Console.WriteLine( "  {0}     {1}", myCulture, myDTFI.LongDatePattern );



This code produces the following output.  The question marks take the place of native script characters.

  en-US     dddd, MMMM dd, yyyy
  ja-JP     yyyy'?'M'?'d'?'
  fr-FR     dddd d MMMM yyyy


.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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