Clock (decimal, binary, hexadecimal), C#

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//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Console.Write(Convert.ToString(System.DateTime.Now.Hour));
            Console.Write(":");
            Console.Write(Convert.ToString(System.DateTime.Now.Minute));
            Console.Write(":");
            Console.WriteLine(Convert.ToString(System.DateTime.Now.Second));
            Console.Write(Convert.ToString(System.DateTime.Now.Hour, 2));
            Console.Write(":");
            Console.Write(Convert.ToString(System.DateTime.Now.Minute, 2));
            Console.Write(":");
            Console.WriteLine(Convert.ToString(System.DateTime.Now.Second, 2));
            Console.Write(Convert.ToString(System.DateTime.Now.Hour, 16));
            Console.Write(":");
            Console.Write(Convert.ToString(System.DateTime.Now.Minute, 16));
            Console.Write(":");
            Console.WriteLine(Convert.ToString(System.DateTime.Now.Second, 16));
        }
    }
}

Show compiler warnings [ - ] Show input
Compilation time: 0.11 sec, absolute running time: 0.09 sec, cpu time: 0.09 sec, average memory usage: 22 Mb, average nr of threads: 5