// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002258/datetime-isfuture

​

// @nuget: Z.ExtensionMethods

​

using System;

using System.Globalization;

​

public class Program

{

    public static void Main()

    {

        DateTime date1 = DateTime.Now.AddYears(2);

        DateTime date2 = new DateTime(2006, 7, 25, 10, 45, 09);

        Display(date1);

        Display(date2);

    }

    public static void Display(DateTime date)

    {

        // C# Extension Method: DateTime - IsFuture

        if(date.IsFuture())

        {

            Console.WriteLine("{0, 40}: It's a future date.", date.ToFullDateTimeString());

        }

        else

        {

            Console.WriteLine("{0, 40}: It's not a future date.", date.ToFullDateTimeString());

        }

    }

}