using System;
 
public class clsFormatDateTime
{
 
    public void Main()
    {
        //**************************************************
        //        Custom DateTime Formatting
        //**************************************************
 
        Console.WriteLine("Custom DateTime Formatting:");
        //Here are custom format specifiers y (year), M (month), d (day), h (hour 12), H (hour 24), m (minute), s (second),
        // f (second fraction), F (second fraction, trailing zeroes are trimmed), t (P.M or A.M) and z (time zone).
 
        //Following examples show how the format specifiers can be used.
        // create date time 2009-12-21 20:04:08.101
        DateTime dt = new DateTime(2009, 12, 20, 20, 4, 8, 101);
 
        // Ways to format year: "9 09 009 2009"   year
        Console.WriteLine(string.Format("{0:y yy yyy yyyy}", dt));
 
        // Ways to format month: "12 12 Dec December"  month
        Console.WriteLine(string.Format("{0:M MM MMM MMMM}", dt));
 
        // Ways to format day: "21 21 Sun Sunday" day
        Console.WriteLine(string.Format("{0:d dd ddd dddd}", dt));
 
        // Ways to format hour: "8 08 20 20"      hour 12/24
        Console.WriteLine(string.Format("{0:h hh H HH}", dt));
 
        // Ways to format minute: "4 04"            minute
        Console.WriteLine(string.Format("{0:m mm}", dt));
 
        // Ways to format second:  ' "8 08"            second 
        Console.WriteLine(string.Format("{0:s ss}", dt));
 
        // Ways to format fraction of second: "1 10 101 1010"   sec.fraction
        Console.WriteLine(string.Format("{0:f ff fff ffff}", dt));
 
        // Ways to format fraction of second: "1 1 101 101"   without zeros
        Console.WriteLine(string.Format("{0:F FF FFF FFFF}", dt));
 
        // How to display am or pm: "P PM"            A.M. or P.M.
        Console.WriteLine(string.Format("{0:t tt}", dt));
 
        // How to display timezone: "-6 -06 -06:00"   time zone
        Console.WriteLine(string.Format("{0:z zz zzz}", dt));
 
 
        //**************************************************
        //        Using date separator / (slash) and time sepatator : (colon).
        //**************************************************
        Console.WriteLine(Environment.NewLine);
        Console.WriteLine("Using date separator / (slash) and time sepatator : (colon):");
 
        //These characters will be rewritten to characters defined 
        //in the current DateTimeFormatInfo.DateSepa­rator and DateTimeFormatInfo.TimeSeparator.
 
 
        // "20/12/09 20:04:08" - english (en-US)
        Console.WriteLine(string.Format("{0:d/M/yyyy HH:mm:ss}", dt));
 
        // "20.12.2009 20:04:08" - german (de-DE)
        // date separator in german culture is "." (so "/" changes to ".")
        Console.WriteLine(string.Format("{0:d/M/yyyy HH:mm:ss}", dt));
 
        //**************************************************
        // Here are some examples of custom date and time formatting:
        //**************************************************
        Console.WriteLine(Environment.NewLine);
        Console.WriteLine("Here are some examples of custom date and time formatting:");
 
        // month/day numbers without/with leading zeroes
        // "12/20/2009"
        Console.WriteLine(string.Format("{0:M/d/yyyy}", dt));
 
        // "12/20/2009"
        Console.WriteLine(string.Format("{0:MM/dd/yyyy}", dt));
 
        // day/month names
        // "Sun, Dec 20, 2009"
        Console.WriteLine(string.Format("{0:ddd, MMM d, yyyy}", dt));
 
        // "Sunday, December 20, 2009"
        // two/four digit year
        Console.WriteLine(string.Format("{0:dddd, MMMM d, yyyy}", dt));
 
        // "12/20/09"
        Console.WriteLine(string.Format("{0:MM/dd/yy}", dt));
 
        // "12/20/2009"
        Console.WriteLine(string.Format("{0:MM/dd/yyyy}", dt));
 
        //**************************************************
        //        Standard DateTime Formatting
        //**************************************************
        Console.WriteLine(Environment.NewLine);
        Console.WriteLine("Standard DateTime Formatting:");
        //In DateTimeFormatInfo there are defined standard patterns for the current culture. 
        //For example, property ShortTimePattern is string that contains value h:mm tt for en-US culture 
        //and value HH:mm for de-DE culture.
 
        //Following table shows patterns defined in DateTimeFormatInfo and their values for en-US culture. 
        //First column contains format specifiers for the String.Format method.
 
        //Specifier DateTimeFormatInfo property Pattern value (for en-US culture) 
        //t ShortTimePattern h:mm tt 
        //d ShortDatePattern M/d/yyyy 
        //T LongTimePattern h:mm:ss tt 
        //D LongDatePattern dddd, MMMM dd, yyyy 
        //f (combination of D and t) dddd, MMMM dd, yyyy h:mm tt 
        //F FullDateTimePattern dddd, MMMM dd, yyyy h:mm:ss tt 
        //g (combination of d and t) M/d/yyyy h:mm tt 
        //G (combination of d and T) M/d/yyyy h:mm:ss tt 
        //m, M MonthDayPattern MMMM dd 
        //y, Y YearMonthPattern MMMM, yyyy 
        //r, R RFC1123Pattern ddd, dd MMM yyyy HH':'mm':'ss 'GMT' (*) 
        //s SortableDateTi­mePattern yyyy'-'MM'-'dd'T'HH':'mm':'ss (*) 
        //u UniversalSorta­bleDateTimePat­tern yyyy'-'MM'-'dd HH':'mm':'ss'Z' (*) 
        //    (*) = culture independent 
 
        //Following examples show usage of standard format specifiers in String.Format method and the resulting output.
 
        // "8:04 PM"                         ShortTime
        Console.WriteLine(string.Format("{0:t}", dt));
 
        // "12/20/2009"                        ShortDate
        Console.WriteLine(string.Format("{0:d}", dt));
 
        // "8:04:08 PM"                      LongTime
        Console.WriteLine(string.Format("{0:T}", dt));
 
        // "Sunday, December 20, 2009"          LongDate
        Console.WriteLine(string.Format("{0:D}", dt));
 
        // "Sunday, December 20, 2009 8:04 PM"  LongDate+ShortTime
        Console.WriteLine(string.Format("{0:f}", dt));
 
        // "Sunday, December 20, 2009 8:04:08 PM" FullDateTime
        Console.WriteLine(string.Format("{0:F}", dt));
 
        // "12/20/2009 8:04 PM"                ShortDate+ShortTime
        Console.WriteLine(string.Format("{0:g}", dt));
 
        // "12/20/2009 8:04:08 PM"             ShortDate+LongTime
        Console.WriteLine(string.Format("{0:G}", dt));
 
        // "December 20"                        MonthDay
        Console.WriteLine(string.Format("{0:m}", dt));
 
        // "December, 2009"                     YearMonth
        Console.WriteLine(string.Format("{0:y}", dt));
 
        // "Sun, 20 Dec 2009 20:04:08 GMT"   
        Console.WriteLine(string.Format("{0:r}", dt));
 
        // "2009-12-20T20:04:08"             SortableDateTime
        Console.WriteLine(string.Format("{0:s}", dt));
 
        // "2009-12-20 20:04:08Z"            UniversalSortableDateTime
        Console.WriteLine(string.Format("{0:u}", dt));
 
        Console.ReadLine();
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
 
namespace CSharp_Syntax
{
    class Program
    {
        static void Main(string[] args)
        {
 
 
            clsFormatDateTime myFormatDateTime = new clsFormatDateTime();
            myFormatDateTime.Main();
 
        }
    }
}