How do you say "Good morning" in Italian? For instance, when I get up and go to my living room, I like to say "good morning" to my family members. I know that it is not "buon mattina". I'm not sure if it is "buon giorno" because it means "good day" and not "good morning". If you can say "buon giorno" in my case (my example) then please tell me the reason!!
You don't say "buongiorno" in the afternoon or evening, so even it means "good day", it's used only in the morning. To express have a good day, you have to say "buona giornata"