bye-bye vs have a nice day

bye-bye

intj

  • Goodbye. 

noun

  • A goodbye. 

  • Bedtime for a toddler, going to sleep, going to bed. 

have a nice day

phrase

  • . A polite parting during daytime. 

  • Used other than figuratively or idiomatically: see have, a, nice, day. 

How often have the words bye-bye and have a nice day occurred in a corpus of books? (source: Google Ngram Viewer )