The release calendar is shifting once again, Summit Entertainment’s highly anticipated adaptation of the Stephenie Meyer teen vampire romance novel Twilight has moved from its Dec. 12 perch to Nov. 21, the date just vacated by Warner Bros.’ “Harry Potter and the Half-Blood Prince.”

Explaining about the changes of release date schedule, co-chairman and CEO of Summit Entertainment Rob Friedman stated that the bumping up offers them the chance to present the movie on more screens. He also noted:

“When Warner Bros. decided to move ‘Harry Potter and the Half-Blood Prince’ to the summer of 2009, we saw a unique opportunity to slot in our film which has been gaining tremendous awareness and momentum over the past several months.”

Friedman added that they were not trying to replace the Potter franchise for this year.

“We by no means are trying to fill the shoes of the incredible Potter franchise for 2008, rather we are just looking to bring the fans of Stephenie Meyer’s incredible book series the film as soon possible from a programming perspective.”