using System;
using System.Globalization;
class MainClass {
    public static void Main() {
        DateTime dt = new DateTime(1900, 2, 29, new JulianCalendar());
    }
}

    

   
 


    using System;
    class MainClass
    {
        public static void Main()
        {

            DateTime dt = new DateTime(1900, 2, 29);
       }
    }

    

   
 

using System;
    class MainClass
    {
        public static void Main()
        {
            TimeSpan timespan1 = new TimeSpan(2, 12, 0, 0);
            TimeSpan timespan2 = new TimeSpan(4, 12, 0, 0);

            TimeSpan oneWeek = timespan1 + timespan2;

            DateTime now = DateTime.Now;

            DateTime past = now - oneWeek;

            DateTime future = now + oneWeek;

            Console.WriteLine("Now   : {0}", now);
            Console.WriteLine("Past  : {0}", past);
            Console.WriteLine("Future: {0}", future); 

       }
    }

    

   
 

   using System;
   
   class MainClass
   {
      public static void Main(string[] args)
      {
         DateTime dt1 = DateTime.Parse("Sep 2005");
         Console.WriteLine(dt1);
         DateTime dt2 = DateTime.Parse("Monday 5 September 2005 14:15:33");
         Console.WriteLine(dt2);
         DateTime dt3 = DateTime.Parse("5, 9,05");
         Console.WriteLine(dt3);
         DateTime dt4 = DateTime.Parse("5/9/2005 14:15:33");
         Console.WriteLine(dt4);
         DateTime dt5 = DateTime.Parse("2:15 PM");
         Console.WriteLine(dt5);

         DateTime dt6 = DateTime.ParseExact("2:13:30 PM", "h:mm:ss tt", null);
         Console.WriteLine(dt6);

         DateTime dt7 = DateTime.ParseExact("Mon, 05 Sep 2005 14:13:30 GMT","ddd, dd MMM yyyy HH':'mm':'ss 'GMT'", null);
         Console.WriteLine(dt7);

         DateTime dt8 = DateTime.ParseExact("September 05", "MMMM dd", null);

         Console.WriteLine(dt8);
       }
   }

    

   
 

using System;
using System.Globalization;

class MainClass {
    public static void Main() {
        // Create some date/time objects
        DateTime dt = new DateTime();
        DateTime dt1 = new DateTime(2001, 12, 31);
        DateTime dt2 = new DateTime(2000, 12, 31, 23, 59, 59);

        
        if (dt2 < dt1)
            Console.WriteLine("Dt2 < Dt1");
        else
            if (dt2 == dt1)
                Console.WriteLine("Dt2 == Dt1");
            else
                Console.WriteLine("Dt2 > Dt1");
    }
}

    

   
 
using System;
using System.Globalization;

class MainClass {
    public static void Main() {
        DateTime dt = new DateTime();
        DateTime dt1 = new DateTime(2001, 12, 31);
        DateTime dt2 = new DateTime(2000, 12, 31, 23, 59, 59);

        // Print them out as strings   
        Console.WriteLine("DT as string: {0}", dt.ToString());
        Console.WriteLine("DT1 as string: {0}", dt1.ToString());
        Console.WriteLine("DT2 as string: {0}", dt2.ToString());

    }
}

    

using System;
using System.Globalization;

class MainClass {
public static void Main() {
DateTime dt = new DateTime();
DateTime dt1 = new DateTime(2001, 12, 31);
DateTime dt2 = new DateTime(2000, 12, 31, 23, 59, 59);

TimeSpan year = new TimeSpan(365 * TimeSpan.TicksPerDay);

for (int i = 0; i < 10; ++i) dt += year; Console.WriteLine("DT as string: {0}", dt.ToString()); } } [/csharp]