To say "have a good day", you could say "Que tenga un buen día". For something like "I can have a good day", you could say "Yo pueda tener un buen día". Notice these are both in the subjunctive: These are wishes or desires, not facts.
Buenos dias = Good day
No es un buen dia = It's not a good day/morning (Spanish does not distinguish between 'good day' and 'good morning')
Good day baby i am good!
buenos días
I am assuming you would like to know how to say "what a Day" in Spanish. That would be Que dia
Buenos días.
A good day
Buen día, buenos días
"Buen día para usted, señor."
Did you have a good day in Spanish.
The phrase "buen día" translates to "good day" in English.
es un buen dia