// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002230/datetime-converttimetoutc

​

// @nuget: Z.ExtensionMethods

​

using System;

public class Program

{

    public static void Main()

    {

        DateTime thisTime = DateTime.Now;

        Console.WriteLine("Time in {0} zone: {1}", TimeZoneInfo.Local.StandardName, thisTime);

        // C# Extension Method: DateTime - ConvertTimeToUtc

        Console.WriteLine("   UTC Time: {0}", thisTime.ConvertTimeToUtc(TimeZoneInfo.Local));

​

        // Get Tokyo Standard Time zone

        TimeZoneInfo tst = TimeZoneInfo.FindSystemTimeZoneById("Tokyo Standard Time");

​

        // C# Extension Method: DateTime - ConvertTime

        DateTime tstTime = thisTime.ConvertTime(TimeZoneInfo.Local, tst);

        Console.WriteLine("Time in {0} zone: {1}", tst.StandardName, tstTime);

​

        // C# Extension Method: DateTime - ConvertTimeToUtc

        Console.WriteLine("   UTC Time: {0}", tstTime.ConvertTimeToUtc(tst));

    }

}