about time vs hereafter

about time

adv
  • Close to the right time. 

  • Far past the desired time. 

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

hereafter

adv
  • From now on. 

  • Sequentially after this point (in time, in the writing constituting a document, in the movement along a path, etc.) 

noun
  • A future existence or state. 

  • Existence after death. 

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