YearMonthPattern Property

DateTimeFormatInfo.YearMonthPattern Property


Gets or sets the custom format string for a year and month value.

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

public string YearMonthPattern { get; set; }

Property Value

Type: System.String

The custom format string for a year and month value.

Exception Condition

The property is being set to null.


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

The YearMonthPattern 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 "y" and "Y" standard format strings.

This property is affected if the value of the Calendar property changes.

We recommend that you set the date separator in the year month pattern to an exact string instead of using the date separator placeholder. For example, to get the pattern MM-yyyy, set the year month pattern to "MM-yyyy".

The following example displays the value of YearMonthPattern 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.YearMonthPattern );



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

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


Universal Windows Platform
Available since 4.5
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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