using System;

using System.Collections.Generic;

public class Program

{

    public void Main()

    {

        var totalMinutes = 1234234;

        Console.WriteLine("{0}:{1:00}", totalMinutes / 60, totalMinutes % 60);

        var time = TimeSpan.FromMinutes(totalMinutes);

        Console.WriteLine("{0}:{1:00}", (int)time.TotalHours, time.Minutes);

    }

​

}