about time vs someday

about time

adv
  • Close to the right time. 

  • Far past the desired time. 

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

someday

adv
  • Sometime; at some unspecified time in the future. 

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