You already have, Luke. You were right about me. Tell your sister … you were right.
– The dying Anakin Skywalker, Return of the Jedi
14th of March 1997 was the premiere of Return of the Jedi, Special Edition, in USA. The rest of the world had to wait until the middle of April, …or longer.
For the re-release George Lucas took the chance to improve the movie. Read of all changes made for every release or just compare the changed frames in Return of the Jedi.