2010-09-29T02:40:00.2291503+05:30

DateTime.Parse("2010-09-29T02:40:00.2291503+05:30");

using System;

public class Example
{
   public static void Main()
   {
       DateTime dat = new DateTime(2009, 6, 15, 13, 45, 30,
                                   DateTimeKind.Unspecified);
       Console.WriteLine("{0} ({1}) --> {0:O}", dat, dat.Kind);

       DateTime uDat = new DateTime(2009, 6, 15, 13, 45, 30,
                                    DateTimeKind.Utc);
       Console.WriteLine("{0} ({1}) --> {0:O}", uDat, uDat.Kind);

       DateTime lDat = new DateTime(2009, 6, 15, 13, 45, 30,
                                    DateTimeKind.Local);
       Console.WriteLine("{0} ({1}) --> {0:O}n", lDat, lDat.Kind);

       DateTimeOffset dto = new DateTimeOffset(lDat);
       Console.WriteLine("{0} --> {0:O}", dto);
   }
}
// The example displays the following output:
//    6/15/2009 1:45:30 PM (Unspecified) --> 2009-06-15T13:45:30.0000000
//    6/15/2009 1:45:30 PM (Utc) --> 2009-06-15T13:45:30.0000000Z
//    6/15/2009 1:45:30 PM (Local) --> 2009-06-15T13:45:30.0000000-07:00
//
//    6/15/2009 1:45:30 PM -07:00 --> 2009-06-15T13:45:30.0000000-07:00