due date vs timer

due date

noun
  • The date by which a task is supposed to be completed. 

  • The date on which a pregnant woman is expected to give birth. 

  • The date by which a book (or other item) borrowed from a library must be returned. 

  • The date of payment in financial arrangements. 

timer

noun
  • One characterized by a certain time or time frame, such as their work hours. 

  • Any electronic function that causes a device to be able to do something automatically after a preset amount of time. 

  • A device used to measure amounts of time. 

  • A person who records the time elapsed in a sporting event. 

  • One who has done something a certain number of times. 

How often have the words due date and timer occurred in a corpus of books? (source: Google Ngram Viewer )