C# - A Simple Clock Implementation

CODE
using System;

class Program
{
    public static void Main(string[] args)
    {
        Clock c = new Clock(10,5,0);
        Console.WriteLine(c.ToString());
        c.Tick();
        Console.WriteLine(c.ToString());
        c.AddSeconds(65);
        Console.WriteLine(c.ToString());
        c.AddSeconds(3600 * 24);
        Console.WriteLine(c.ToString());
    }
}

class Clock
{
    private int hours;
    private int minutes;
    private int seconds;

    public Clock(int hours, int minutes, int seconds)
    {
        this.hours = hours;
        this.minutes = minutes;
        this.seconds = seconds;

        if (hours > 23 || minutes > 59 || seconds > 59 || hours < 0 || minutes < 0 || seconds < 0)
            throw new Exception("Please enter a valid time.");
    }

    public override string ToString()
    {
        return hours.ToString("00") + ":" + minutes.ToString("00") + ":" + seconds.ToString("00");
    }

    public void Tick()
    {
        Console.WriteLine("1 second added...");
        seconds++;
        if (seconds == 60)
        {
            seconds = 0;
            minutes++;
        }

        if(minutes == 60)
        {
            minutes = 0;
            hours++;
        }

        if (hours == 24)
            hours = 0;
    }

    public void AddSeconds(int seconds)
    {
        Console.WriteLine("{0} second added...", seconds);
        int totalSeconds = 0;
        int remainingSeconds;

        totalSeconds += this.seconds;
        totalSeconds += this.minutes * 60;
        totalSeconds += this.hours * 3600;
        totalSeconds += seconds;

        this.hours = totalSeconds / 3600;
        remainingSeconds = totalSeconds - (this.hours * 3600);
        this.hours = this.hours % 24;

        this.minutes = remainingSeconds / 60;
        remainingSeconds = remainingSeconds - (this.minutes * 60);

        this.seconds = remainingSeconds;
    }
}
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C# - A Simple Clock Implementation

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