about time vs hereat

about time

adv
  • Close to the right time. 

  • Far past the desired time. 

  • Used other than figuratively or idiomatically: see about, time. 

hereat

adv
  • At this time; upon this event. 

  • At this; because of this. 

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