format datetime to string like 'fr, 28.10.2022' day of week stays two charactes but naguage can change so it can be in german or french in csharp

To format a DateTime object to a string with a specific format and language, you can use the ToString method along with a custom format string and a CultureInfo object. Here's an example code snippet that formats the current date in the desired format for both German and French cultures:

main.cs
DateTime now = DateTime.Now;

// German culture
CultureInfo germanCulture = new CultureInfo("de-DE");
string formattedDateDE = now.ToString("ddd, dd.MM.yyyy", germanCulture);

// French culture
CultureInfo frenchCulture = new CultureInfo("fr-FR");
string formattedDateFR = now.ToString("ddd, dd.MM.yyyy", frenchCulture);

Console.WriteLine($"German: {formattedDateDE}");
Console.WriteLine($"French: {formattedDateFR}");
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The output of this code will be something like:

main.cs
German: Fr, 28.10.2022
French: ven., 28.10.2022
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Note that the ddd format specifier is used to display the abbreviated day of the week name with two characters.

The CultureInfo object is used to specify the language and culture-specific formatting information. In the example above, we create two CultureInfo objects for the German and French cultures ("de-DE" and "fr-FR", respectively). You can use any other culture code that is available on your system.

By passing the CultureInfo object as a second argument to the ToString method, you can ensure that the date is formatted correctly for that culture, including the correct order of day, month, and year components, as well as any language-specific formatting rules.