Record Time Custom Attribute C#

Question

I am trying to write a custom attribute which will log start time of a method.

Here it is my code :

    public class Program
    {
        public static void Main(string[] args)
        {

            try
            {
                CompareBusinessUnits();
            }
            catch (Exception ex)
            {
                throw;
            }
        }

        [RecordTime]
        private static void CompareBusinessUnits()
        {

            // to do something
        }


    }


    public class RecordTimeAttribute : Attribute
    {
        public void PrintStartTime()
        {
            Console.WriteLine("Start Time " + DateTime.Now);
        }
    }

But console window does not show start time. I want to print the time when the method starts.