My most used phrase would be “Have a good one.”
I started using this in my 20’s when I would switch between day & night shift in the restaurant I managed. I got tired of people correcting me when I would say “Have a good day/night” at the wrong time so I went to “Have a good one.”
The Eyes In The Back Of My Head 
annebellasays
/ March 14, 2016Omg, I need to start saying that! I always screw that up. I’ll say, “Have a good night ( in the morning), well you know what I mean!” Drrrrr. Very smart!