using System;

public class Program

{

    public static void Main()

    {

        // Note, since dotnetfiddle runs on a system set to the 0 offset (UTC), DateTimeKind specifics become a somewhat moot point.

        // Copy this to a console app on a system with a -8:00 offset to see the commented values

            DateTime utcTime = new DateTime(2023, 10, 1, 12, 0, 0, DateTimeKind.Utc);

            DateTime localTime = new DateTime(2023, 10, 1, 12, 0, 0, DateTimeKind.Local);

            DateTime unspecifiedTime = new DateTime(2023, 10, 1, 12, 0, 0); // Default kind is DateTimeKind.Unspecified

​

            Console.WriteLine("localToUniversal: {0}", localTime.ToUniversalTime());

            // 10/1/2023 7:00:00 PM - No change since it is already a universal time

            Console.WriteLine("utcToUniversal: {0}", utcTime.ToUniversalTime());

            // 10/1/2023 12:00:00 PM - Converted to UTC based on system offset

            Console.WriteLine("unspecifiedToUniversal: {0}", unspecifiedTime.ToUniversalTime());

            // 10/1/2023 7:00:00 PM - Converted to UTC based on system offset -- ToUniversalTime assumes Unspecified was Local time.

            Console.WriteLine("unspecifiedToLocal: {0}", unspecifiedTime.ToLocalTime());

            // 10/1/2023 5:00:00 AM - Converted to Local based on system offset -- ToLocalTime assumes Unspecified was UTC time.

​

            Console.WriteLine("localTicks: {0}", localTime.Ticks);

            // 638317584000000000

            Console.WriteLine("utcTicks: {0}", utcTime.Ticks);

            // 638317584000000000

            Console.WriteLine("unspecifiedTicks: {0}", unspecifiedTime.Ticks);

            // 638317584000000000

​

​

            Console.WriteLine("localToUniversalTicks: {0}", localTime.ToUniversalTime().Ticks);

            // 638317836000000000

            Console.WriteLine("utcToUniversalTicks: {0}", utcTime.ToUniversalTime().Ticks);

            // 638317584000000000

            Console.WriteLine("unspecifiedToUniversalTicks: {0}", unspecifiedTime.ToUniversalTime().Ticks);

            // 638317836000000000 - Different because the original time was assumed to be Local and was converted to UTC

            Console.WriteLine("unspecifiedToLocalTicks: {0}", unspecifiedTime.ToLocalTime().Ticks);

            // 638317332000000000 - Different because the original time was assumed to be UTC and was converted to Local.

​

            Console.WriteLine("utcEqualsLocal: {0}", utcTime == localTime);

            // True - This is true because both share the same “ticks” representation, even though local time is actually 7 hours behind UTC in this example.

            // Meanwhile, the times are truly 7 hours apart in real-world context.

​

            Console.WriteLine("unspecifiedEqualsLocal: {0}", unspecifiedTime == localTime);

            // True

            Console.WriteLine("unspecifiedEqualsUtc: {0}", unspecifiedTime == utcTime);

            // True

​

            Console.WriteLine("localUniversalEqualsUtcUniversal: {0}", localTime.ToUniversalTime() == utcTime.ToUniversalTime());

            // False

            Console.WriteLine("unspecifiedUniversalEqualsLocalUniversal: {0}", unspecifiedTime.ToUniversalTime() == localTime.ToUniversalTime());

            // True

            Console.WriteLine("unspecifiedUniversalEqualsUtcUniversal: {0}", unspecifiedTime.ToUniversalTime() == utcTime.ToUniversalTime());

            // False

    }

}