[C#] Format DateTime as String Examples

Some examples and tips on C# DateTime formatting using string.Format() or .ToString() methods.

Standard DateTime format

Standard formats are typically used when you need a fast string representation of your DateTime object based on current culture.

DateTime date = DateTime.Now;
// Short date:
string.Format("{0:d}", date)   // 9/16/2025
// Long date:
string.Format("{0:D}", date)   // Tuesday, September 16, 2025 
// Short time:
string.Format("{0:t}", date)   // 10:30 PM
// Long time:
string.Format("{0:T}", date)   // 10:30:48 PM
// Full date/time (short time):
string.Format("{0:f}", date)   // Tuesday, September 16, 2025 10:30 PM
// Full date/time (long time):
string.Format("{0:F}", date)   // Tuesday, September 16, 2025 10:30:48 PM
// General  date/time (long time):
string.Format("{0:g}", date)   // 9/16/2025 10:30 PM
// General  date/time (long time):
string.Format("{0:G}", date)   // 9/16/2025 10:30:48 PM
// Sortable date/time:
string.Format("{0:s}", date)   // 2025-09-16T22:30:48

Custom DateTime format

Custom formats are useful when you need more flexibility on the output string format.

DateTime date = DateTime.Now;
string.Format("{0:MM/dd/yyyy}", date)   // 09/16/2025
string.Format("{0:MMMM dd, yyyy}", date)// September 16, 2025
string.Format("{0:MMM yyyy}", date)     // Sep 2025
string.Format("{0:hh:mm tt}", date)     // 10:30 PM

// Year patterns:
string.Format("{0:yy yyy yyyy}", date)  // 25 2025 2025
// Month patterns:
string.Format("{0:MM MMM MMMM}", date)  // 09 Sep September
// Day patterns:
string.Format("{0:dd ddd dddd}", date)  // 16 Tue Tuesday
// Hour
string.Format("{0:hh HH tt}", date)     // 10 22 PM
// Minute, second, second fraction 
string.Format("{0:mm ss ffff}", date)   // 30 48 0739

Format DateTime for a specific culture

When you format a DateTime with DateTime.ToString() you can also specify the culture to use.


using System.Globalization;
// ...
DateTime date = DateTime.Now;
// InvariantCulture 
CultureInfo invC = CultureInfo.InvariantCulture;
date.ToString("f", invC)        // Tuesday, 16 September 2025 22:30 
date.ToString("d", invC)        // 09/16/2025 
date.ToString("t", invC)        // 22:30 
// German CultureInfo 
CultureInfo deC = new CultureInfo("de-De");
date.ToString("f", deC)        // Dienstag, 16. September 2025 22:30 
date.ToString("d", deC)        // 16.09.2025 
date.ToString("t", deC)        // 22:30 
// French CultureInfo 
CultureInfo frC = new CultureInfo("fr-FR");
date.ToString("f", frC)        // mardi 16 septembre 2025 22:30 
date.ToString("d", frC)        // 16/09/2025 
date.ToString("t", frC)        // 22:30 
// Spanish CultureInfo 
CultureInfo esC = new CultureInfo("es-ES");
date.ToString("f", esC)        // martes, 16 de septiembre de 2025 22:30 
date.ToString("d", esC)        // 16/09/2025 
date.ToString("t", esC)        // 22:30

Character escape and text

Any characters not used by the formatter is reported in the result string. If you need to enter text with reserved characters that must be inserted between two ' (single quote).

DateTime date = DateTime.Now;
// Escaped date text
string.Format("{0:'y:' yyyy' m:' M 'd:' d}", date)  // y: 2025 m: 9 d: 16 
// Force time format to use ':' as separator ()
string.Format("{0:HH':'mm}", date)                  // 22:30

TOOL: Test you format string

A simple tool for test your format string.