using System;

public class Program

{

    public static void Main()

    {

        // leap year

        var x = new DateTime(2020, 2, 28, 22, 00, 00);

        Console.WriteLine(x);

        x = x.AddMinutes(60);

        Console.WriteLine(x);

        x = x.AddMinutes(360);

        Console.WriteLine(x);

        // non-leap year

        x = new DateTime(2021, 2, 28, 22, 00, 00);

        Console.WriteLine(x);

        x = x.AddMinutes(60);

        Console.WriteLine(x);

        x = x.AddMinutes(360);

        Console.WriteLine(x);

​

    }

}