DateTimeFormatInfo Class
The DateTimeFormatInfo class provides culture-specific information about the format of date and time values. It is used by the DateTime and TimeSpan parsing and formatting methods.
Properties
public string ShortDatePattern { get; set; }
Gets or sets the format pattern for a short date value.
public string LongDatePattern { get; set; }
Gets or sets the format pattern for a long date value.
public string ShortTimePattern { get; set; }
Gets or sets the format pattern for a short time value.
public string LongTimePattern { get; set; }
Gets or sets the format pattern for a long time value.
Methods
public string GetMonthName(int month)
Returns the culture-specific name of the specified month.
public string GetAbbreviatedMonthName(int month)
Returns the abbreviated name of the specified month.
public string GetDayName(DayOfWeek dayOfWeek)
Returns the culture-specific culture name of the specified day of the week.
Example
using System;
using System.Globalization;
class Program
{
static void Main()
{
var dtfi = CultureInfo.GetCultureInfo("en-US").DateTimeFormat;
dtfi.ShortDatePattern = "yyyy-MM-dd";
dtfi.ShortTimePattern = "HH:mm";
DateTime now = DateTime.Now;
Console.WriteLine(now.ToString("d", dtfi)); // 2025-09-10
Console.WriteLine(now.ToString("t", dtfi)); // 14:23
Console.WriteLine(dtfi.GetMonthName(12)); // December
}
}