Definition of "out of date"

out of date

prepositional phrase
1. (idiomatic) Too old to be used; not current; invalid; outmoded.
  Quotations
  Owing to the time lag which must occur between the dates of closing for press and publication, it sometimes happens that items of news are out of date, or inaccurate, by the time they reach readers.
  1947 January and February, “Notes and News: Steamer Services on the Clyde”, in Railway Magazine, page 50
2. (idiomatic) Not conforming to the current fashion or style; old-fashioned.