Green Day's Billie Joe Armstrong is a "geezer" no more! The rocker, who has expanded his acting credits in recent years, was set to take on the lead role in a film that has been called Geezer for much of the past year, but now has a new title -- Ordinary World -- and a fresh release date -- Oct. 14.

Though Armstrong has made guest appearances on TV shows and turned up on the big screen, Ordinary World will mark the first time he's been the lead in a film. According to Deadline, he appears as Perry, an aging former punk rocker turned family man who gets the bug to revisit his youthful passion when his brother (Chris Messina) gives him the money to throw a huge 40th birthday rockstar bash to help get his past out of his system. But the experience allows Perry's punk past to clash with his current middle-age reality. The Lee Kirk-directed film also stars Judy Greer, Selma Blair, Dallas Roberts, Fred Armisen, Brian Baumgartner and Kevin Corrigan and includes music by Billie Joe Armstrong as well.

The film premiered at the Tribeca Film Festival back in April, with Armstrong playing a post-screening concert with special guest Joan Jett. As for the October release, it will be a "day-and-date" release, meaning that the movie will be available from retailers and in select theaters on the same day (Oct. 14).

Armstrong's past movie credits include the Judd Apatow film This Is 40 and the Leighton Meester-starring Like Sunday, Like Rain. He also had a multi-episode stint on the Showtime series Nurse Jackie.

Billie Joe will also get back to music this fall, as Green Day's latest album, Revolution Radio, is set to drop Oct. 7 via Reprise Records. It should also be noted that a song called "Ordinary World" is the closing track on the upcoming disc.

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