"African" is not a language. It is a continent that contains 54 countries and more than 2100 completely different languages. Some estimates place the number of languages at around 3000.
If you have any quesitons about African languages, you will have to specify the language.
The most prominent languages spoken in Africa are:
Afrikaans
Amharic
Arabic
English
French
Fula
Hausa
Igbo
Oroma
Somali
Swahili
Yoruba
Zulu
You say "I am good" in Maasai language of the African origin as "Epa!".
You say Good morning in Kisii language of the African origin as Bwakire.
You say Good evening in Kisii language of the African origin as Bwairire.
Buenos dias = Good day
Good Day
You say "I am good" in Maasai language of the African origin as "Epa!".
"Oli otya" is how to say good day in Luganda.
In Bahamian Creole, you can say "Good Day" as "Good marning" or "Good afternoon" as "Good evening".
To say "have a good day" in Hawaiian, you can say "Maluhia maika'i o kākou."
In Flemish, you can say "goedendag" which means good day.
You can say "Good day" or "Hello" to greet someone in English.
In Cree, you can say "Kiya pimatisiwin" to mean "Have a good day."
"Roja baş" is how you say "good day" in Kurdish.
You say Good morning in Kisii language of the African origin as Bwakire.
You say Good evening in Kisii language of the African origin as Bwairire.
buon pomeriggio
You can say "You too!" in response to someone wishing you to have a good day.