using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace oraperc
{
    class Program
    {
        static void Main(string[] args)
        {
            DateTime[] datumok = { DateTime.Now, DateTime.Now.AddHours(8), DateTime.Now.AddSeconds(77) };
            foreach (var item in datumok)
            {
                Console.WriteLine(MyExtensions.oraperc(item));
            }
            Console.ReadKey();
        }
    }
    static class MyExtensions
    {
        public static string oraperc(DateTime d)
        {
            return d.Hour.ToString("D2") + ":" + d.Minute.ToString("D2");
        }
    }

}