hard stop vs time of day

hard stop

noun
  • A definite time when someone must end a task in order to meet another time commitment. 

  • A mechanical device that limits the travel of a mechanism. 

  • A tactic used by armed police to stop a vehicle believed to contain dangerous criminals. 

  • Synonym of full stop 

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 hard stop and time of day occurred in a corpus of books? (source: Google Ngram Viewer )