chronometer vs time of day

chronometer

noun
  • A device for measuring time, such as a watch or clock. 

time of day

noun
  • The time according to the clock. 

  • A loosely specified period of time, minutes or hours in duration, especially daytime, or point in time. 

  • The greeting appropriate to the time of day. 

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