using System;
 
public class Test
{
    static DateTime RandomDay()
    {
        DateTime start = new DateTime(1995, 1, 1);
        Random gen = new Random();
 
        int range = (DateTime.Today - start).Days;
        return start.AddDays(gen.Next(range));
    }
 
 
	public static void Main()
	{
        var randomDate = RandomDay();
        TimeSpan TimeDifference = DateTime.Now - randomDate;
        string result = string.Format(@"{0:hh\:mm\:ss}", TimeDifference);
        Console.WriteLine(result);
        DateTime dt = DateTime.MinValue.Add(TimeDifference);
        result = dt.ToString(@"hh\:mm\:ss");
        Console.WriteLine(result);
	}
}

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