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);
x = x.AddMinutes(360);
// non-leap year
x = new DateTime(2021, 2, 28, 22, 00, 00);
}