day-to-day vs from day to day

day-to-day

adv
  • On a daily basis. 

noun
  • Ordinary, monotonous routine; that which is usual or mundane. 

adj
  • Happening every day. 

  • Subject to daily redetermination. 

  • Ordinary or mundane. 

from day to day

adv
  • daily. 

  • focusing on one day at a time. 

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