AbbreviatedDayNames Property

DateTimeFormatInfo.AbbreviatedDayNames Property


Gets or sets a one-dimensional array of type String containing the culture-specific abbreviated names of the days of the week.

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

public string[] AbbreviatedDayNames { get; set; }

Property Value

Type: System.String[]

A one-dimensional array of type String containing the culture-specific abbreviated names of the days of the week. The array for InvariantInfo contains "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", and "Sat".

Exception Condition

The property is being set to null.


The property is being set to an array that is multidimensional or that has a length that is not exactly 7.


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

If setting this property, the array must be one-dimensional and must have exactly seven elements. The first element (the element at index zero) represents the first day of the week in the calendar defined by the Calendar property.

If a custom format string includes the "ddd" format specifier, the DateTime.ToString or ToString method includes the appropriate member of the AbbreviatedDayNames array in place of the "ddd" in the result string.

This property is affected if the value of the Calendar property changes. If the selected Calendar does not support abbreviated day names, the array contains the full day names.

The following example creates a read/write CultureInfo object that represents the English (United States) culture and assigns abbreviated day names to its AbbreviatedDayNames property. It then uses the "ddd" format specifier in a to display the string representation of dates for one week beginning May 28, 2014.

using System;
using System.Globalization;

public class Example
   public static void Main()
      CultureInfo ci = CultureInfo.CreateSpecificCulture("en-US");
      DateTimeFormatInfo dtfi = ci.DateTimeFormat;
      dtfi.AbbreviatedDayNames = new String[] { "Su", "M", "Tu", "W", 
                                                "Th", "F", "Sa" };  
      DateTime dat = new DateTime(2014, 5, 28);

      for (int ctr = 0; ctr <= 6; ctr++) {
         String output = String.Format(ci, "{0:ddd MMM dd, yyyy}", dat.AddDays(ctr));
// The example displays the following output:
//       W May 28, 2014
//       Th May 29, 2014
//       F May 30, 2014
//       Sa May 31, 2014
//       Su Jun 01, 2014
//       M Jun 02, 2014
//       Tu Jun 03, 2014

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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