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

The "D" format specifier in C# represents the long date format pattern. It displays dates in a culture-specific long format, showing the full day name, month name, day, and year without time information.

The format string is defined by the culture's DateTimeFormatInfo.LongDatePattern property and varies based on the specified culture.

Syntax

Following is the syntax for using the "D" format specifier −

DateTime.ToString("D")
DateTime.ToString("D", CultureInfo)

The default custom format string for English (US) culture is −

dddd, dd MMMM yyyy

Using "D" Format with Default Culture

Example

using System;

class Demo {
    static void Main() {
        DateTime myDate = new DateTime(2018, 9, 20);
        Console.WriteLine("Long Date Format: " + myDate.ToString("D"));
        
        DateTime currentDate = DateTime.Now;
        Console.WriteLine("Current Date: " + currentDate.ToString("D"));
    }
}

The output of the above code is −

Long Date Format: Thursday, September 20, 2018
Current Date: Monday, December 23, 2024

Using "D" Format with Specific Cultures

Example

using System;
using System.Globalization;

class Demo {
    static void Main() {
        DateTime myDate = new DateTime(2018, 9, 20);
        
        Console.WriteLine("US English: " + myDate.ToString("D", CultureInfo.CreateSpecificCulture("en-US")));
        Console.WriteLine("French: " + myDate.ToString("D", CultureInfo.CreateSpecificCulture("fr-FR")));
        Console.WriteLine("German: " + myDate.ToString("D", CultureInfo.CreateSpecificCulture("de-DE")));
        Console.WriteLine("Spanish: " + myDate.ToString("D", CultureInfo.CreateSpecificCulture("es-ES")));
    }
}

The output of the above code is −

US English: Thursday, September 20, 2018
French: jeudi 20 septembre 2018
German: Donnerstag, 20. September 2018
Spanish: jueves, 20 de septiembre de 2018

Comparison with Other Date Format Specifiers

Getting the Long Date Pattern

Example

using System;
using System.Globalization;

class Demo {
    static void Main() {
        CultureInfo usCulture = CultureInfo.CreateSpecificCulture("en-US");
        CultureInfo frenchCulture = CultureInfo.CreateSpecificCulture("fr-FR");
        
        Console.WriteLine("US Long Date Pattern: " + usCulture.DateTimeFormat.LongDatePattern);
        Console.WriteLine("French Long Date Pattern: " + frenchCulture.DateTimeFormat.LongDatePattern);
        
        DateTime date = new DateTime(2018, 9, 20);
        Console.WriteLine("\nFormatted Dates:");
        Console.WriteLine("US: " + date.ToString("D", usCulture));
        Console.WriteLine("French: " + date.ToString("D", frenchCulture));
    }
}

The output of the above code is −

US Long Date Pattern: dddd, MMMM d, yyyy
French Long Date Pattern: dddd d MMMM yyyy
  
Formatted Dates:
US: Thursday, September 20, 2018
French: jeudi 20 septembre 2018

Conclusion

The "D" format specifier provides culture-aware long date formatting in C#. It automatically adapts to different cultures, displaying dates with full day and month names in the appropriate language and format. This makes it ideal for user-facing applications that need to display dates in a readable, localized format.