Compare DateTime and returns an integer that indicates the sequence in CSharp

//from  ww  w.ja v a2  s.c  om
using System;

public class DateTimeComparison
{
   private enum DateComparisonResult
   {
      Earlier = -1,
      Later = 1,
      TheSame = 0
   };

   public static void Main()
   {
      DateTime thisDate = DateTime.Today;

      DateTime thisDateNextYear, thisDateLastYear;

      // Call AddYears instance method to add/substract 1 year
      thisDateNextYear = thisDate.AddYears(1);
      thisDateLastYear = thisDate.AddYears(-1);   

      // Compare dates 
      DateComparisonResult comparison;
   
      comparison = (DateComparisonResult) thisDate.CompareTo(thisDateLastYear);
      Console.WriteLine("CompareTo method returns {0}: {1:d} is {2} than {3:d}", 
                        (int) comparison, thisDate, comparison.ToString().ToLower(), 
                        thisDateLastYear);

   }
}