Meaning of release date

release' date"

Pronunciation: [key]
— Journalism. Journalism.
  1. the time, as the day, part of the day, and sometimes the hour, on or at which release copy may be published or broadcast.
  2. the printed notation of this time on a press release or other advance.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.