Custom DateTime Formats

Custom DateTime format strings allow you to define exactly how a DateTime value is represented as a string. They are composed of format specifiers that represent various parts of a date and time, such as year, month, day, hour, minute, and second.

Examples of commonly used format specifiers:

• yyyy – 4-digit year (e.g., 2025)
• MM – 2-digit month (e.g., 07)
• dd – 2-digit day (e.g., 11)
• HH – 2-digit hour in 24-hour format (e.g., 14)
• mm – 2-digit minute (e.g., 45)
• ss – 2-digit second (e.g., 30)
• dddd – full name of the day (e.g., Friday)
• MMMM – full name of the month (e.g., July)

Example usage:

DateTime now = DateTime.Now;
string formatted = now.ToString("yyyy-MM-dd HH:mm:ss");
// Output: "2025-07-11 14:45:30"

Full formatter options