I would say have a nice day, but maybe not.
What about the way they say, Have a nice day.
On the first nice day I went down to the court.
The two of us spent a very nice day together while you were in Florida.
As they say in my country, have a nice day.
Here, I could even walk to the store on a nice day.
It was going to be a nice day, after all.
I think it actually does end up by saying have a nice day.
This really is not going to be a nice day.
She said that was a nice day they've all gone out.