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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.datetimeoffset.compareto below:

DateTimeOffset.CompareTo(DateTimeOffset) Method (System) | Microsoft Learn

public:
 virtual int CompareTo(DateTimeOffset other);

public int CompareTo(DateTimeOffset other);

abstract member CompareTo : DateTimeOffset -> int
override this.CompareTo : DateTimeOffset -> int

Public Function CompareTo (other As DateTimeOffset) As Integer

A signed integer that indicates the relationship between the current DateTimeOffset object and other, as the following table shows.

The following example illustrates calls to the CompareTo method to compare DateTimeOffset objects.

using System;

public class CompareTimes
{
   private enum TimeComparison
   {
      Earlier = -1,
      Same = 0,
      Later = 1
   };

   public static void Main()
   {
      DateTimeOffset firstTime = new DateTimeOffset(2007, 9, 1, 6, 45, 0,
                                 new TimeSpan(-7, 0, 0));

      DateTimeOffset secondTime = firstTime;
      Console.WriteLine("Comparing {0} and {1}: {2}",
                        firstTime, secondTime,
                        (TimeComparison) firstTime.CompareTo(secondTime));

      secondTime = new DateTimeOffset(2007, 9, 1, 6, 45, 0,
                       new TimeSpan(-6, 0, 0));
      Console.WriteLine("Comparing {0} and {1}: {2}",
                       firstTime, secondTime,
                       (TimeComparison) firstTime.CompareTo(secondTime));

      secondTime = new DateTimeOffset(2007, 9, 1, 8, 45, 0,
                       new TimeSpan(-5, 0, 0));
      Console.WriteLine("Comparing {0} and {1}: {2}",
                       firstTime, secondTime,
                       (TimeComparison) firstTime.CompareTo(secondTime));
      // The example displays the following output to the console:
      //       Comparing 9/1/2007 6:45:00 AM -07:00 and 9/1/2007 6:45:00 AM -07:00: Same
      //       Comparing 9/1/2007 6:45:00 AM -07:00 and 9/1/2007 6:45:00 AM -06:00: Later
      //       Comparing 9/1/2007 6:45:00 AM -07:00 and 9/1/2007 8:45:00 AM -05:00: Same
   }
}

open System

type TimeComparison =
    | Earlier = -1
    | Same = 0
    | Later = 1

let firstTime = DateTimeOffset(2007, 9, 1, 6, 45, 0, TimeSpan(-7, 0, 0))

let secondTime = firstTime
printfn $"Comparing {firstTime} and {secondTime}: {firstTime.CompareTo secondTime |> enum<TimeComparison>}"

let thirdTime = DateTimeOffset(2007, 9, 1, 6, 45, 0, TimeSpan(-6, 0, 0))
printfn $"Comparing {firstTime} and {thirdTime}: {firstTime.CompareTo thirdTime |> enum<TimeComparison>}"

let fourthTime = new DateTimeOffset(2007, 9, 1, 8, 45, 0,
                new TimeSpan(-5, 0, 0))
printfn $"Comparing {firstTime} and {fourthTime}: {firstTime.CompareTo fourthTime |> enum<TimeComparison>}" 
                
// The example displays the following output to the console:
//       Comparing 9/1/2007 6:45:00 AM -07:00 and 9/1/2007 6:45:00 AM -07:00: Same
//       Comparing 9/1/2007 6:45:00 AM -07:00 and 9/1/2007 6:45:00 AM -06:00: Later
//       Comparing 9/1/2007 6:45:00 AM -07:00 and 9/1/2007 8:45:00 AM -05:00: Same

Module CompareTimes
   Private Enum TimeComparison As Integer
      Earlier = -1
      Same = 0
      Later = 1
   End Enum
      
   Public Sub Main()
      Dim firstTime As New DateTimeOffset(#09/01/2007 6:45:00AM#, _
                       New TimeSpan(-7, 0, 0))
  
      Dim secondTime As DateTimeOffset = firstTime
      Console.WriteLine("Comparing {0} and {1}: {2}", _
                        firstTime, secondTime, _
                        CType(firstTime.CompareTo(secondTime), _
                              TimeComparison))

      secondTime = New DateTimeOffset(#09/01/2007 6:45:00AM#, _
                       New TimeSpan(-6, 0, 0))      
      Console.WriteLine("Comparing {0} and {1}: {2}", _
                       firstTime, secondTime, _
                       CType(firstTime.CompareTo(secondTime), _
                             TimeComparison))
      
      secondTime = New DateTimeOffset(#09/01/2007 8:45:00AM#, _
                       New TimeSpan(-5, 0, 0))
      Console.WriteLine("Comparing {0} and {1}: {2}", _
                       firstTime, secondTime, _
                       CType(firstTime.CompareTo(secondTime), _
                             TimeComparison))
      ' The example displays the following output to the console:
      '       Comparing 9/1/2007 6:45:00 AM -07:00 and 9/1/2007 6:45:00 AM -07:00: Same
      '       Comparing 9/1/2007 6:45:00 AM -07:00 and 9/1/2007 6:45:00 AM -06:00: Later
      '       Comparing 9/1/2007 6:45:00 AM -07:00 and 9/1/2007 8:45:00 AM -05:00: Same      
   End Sub
End Module

This method compares DateTimeOffset objects by comparing their UtcDateTime values; that is, it determines whether the two objects represent a single point in time, and indicates whether the current object is earlier than, later than, or the same as the other parameter.

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