DateTime.Now.DayOfWeek.ToString() with CultureInfo

I have the code:

DateTime.Now.DayOfWeek.ToString()

That give's me the english day of the week name, I want to have the german version, how to add CultureInfo here to get the german day of the week name?

var culture = new System.Globalization.CultureInfo("de-DE");
var day = culture.DateTimeFormat.GetDayName(DateTime.Today.DayOfWeek);

You can use the DateTimeFormat.DayNames property of the german CultureInfo. For example:

CultureInfo german = new CultureInfo("de-DE");
string sunday = german.DateTimeFormat.DayNames[(int)DayOfWeek.Sunday];

This is the solution in Visual Basic

Dim GermanCultureInfo As Globalization.CultureInfo = New Globalization.CultureInfo("de-DE")

Return GermanCultureInfo.DateTimeFormat.GetDayName(DayOfWeek.Sunday)

The function of the solution is Obsolete by the way DateTime.Now.ToString("dddd", new System.Globalization.CultureInfo("de-DE"))

DayOfWeek is an enumeration, so the ToString method on it is not culture sensitive.

You will need to write a function to convert the Enum value to a corresponding string in German, if you insist on using DayOfWeek:

string DayOfWeekGerman(DayOfWeek dow)
{

    switch(dow)
    {
      case(DayOfWeek.Sunday)
         return "German Sunday";
      case(DayOfWeek.Monday)
         return "German Monday";
      ...
    }
}

A better approach is to use ToString from DateTime directly:

CultureInfo german = new CultureInfo("de-DE");
string dayName = DateTime.Now.ToString("dddd", german);
  

I like this one:

public static class DateTimeExtension
{
	public static string GetDayOfWeek(this DateTime uiDateTime, CultureInfo culture = null)
	{
		if (culture == null)
		{
			culture = Thread.CurrentThread.CurrentUICulture;
		}

		return culture.DateTimeFormat.GetDayName(uiDateTime.DayOfWeek);
	}
}

And according to your question:

var culture = new System.Globalization.CultureInfo("de-DE");
var day = uiDateTime.GetDayOfWeek(culture);

You can use this code to return your day name as same language

CultureInfo myCI = new CultureInfo("ar-EG");   
MessageBox.Show(myCI.DateTimeFormat.GetDayName(DayOfWeek.Friday));

note: DateTime returns a DayOfWeek Enumeration so I use the code to return from another Enumeration