gistfile1.txt

        Console.WriteLine("Enter a time value in the 24-hour time format (e.g. 19:00):");
        var input = Console.ReadLine();

        if (string.IsNullOrEmpty(input) || string.IsNullOrWhiteSpace(input))
            Console.WriteLine("Invalid Time");            

        var lowTime = DateTime.Parse("00:00");
        var highTime = DateTime.Parse("23:59");
        var inputTime = DateTime.Parse(input);

        try
        {
            if (inputTime >= lowTime && inputTime <= highTime)
                Console.WriteLine("Ok");
            else
                Console.WriteLine("Invalid Time");
        }
        catch (Exception e)
        {
            Console.WriteLine("Generic Exception Handler: {0}", e.ToString());
        }