Long Date ("D") Format Specifier in C#

The "D" format specifier represents a custom date and time format string.

The format string is defined by culture's DateTimeFormatInfo.LongDatePattern property.

The custom format string is −

dddd, dd MMMM yyyy

Example

 Live Demo

using System;
using System.Globalization;
class Demo {
   static void Main() {
      DateTime myDate = new DateTime(2018, 9, 20);
      Console.WriteLine(myDate.ToString("D", CultureInfo.CreateSpecificCulture("en-US")));
   }
}

Output

Thursday, September 20, 2018