using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var startDate = DateTime.Parse("2024-05-27T00:00:00Z"); 

        var endDate = DateTime.Parse("2024-05-29T00:00:00Z"); 

        var blockSizeHours = 6;

        var dates = Enumerable.Range(0, ((int)(endDate - startDate).TotalHours + 1)/blockSizeHours)

                      .Select(x => startDate.AddHours(x*blockSizeHours))

                      .ToList();

        foreach(DateTime date in dates)

        {

            Console.WriteLine(date);

        }

    }

}