Okay, let me try this one again. example I have had letters delivered to me that had abuses. I had letters delivered to me that had abuses. The second is simple past use of had. It means that at some particular time in the past, such letters were delivered to you. The first is the slightly more complicated present perfect. It means that at undefined time in past, such letters were delivered to you. I hope that this is a little more clear

I have had a good day is another way of saying "I've had the time of my life." That is what this song is talking about. I remember it fondly, as it is the on the sound track to my favorite movie.

"Have had" is the present perfect conjugation of the verb "to have", meaning to possess. English learners quite understandably are confused when they encounter this form of the verb.