The announcement comes just over a month after Green Day frontman Billie Joe Armstrong complained to the iHeartRadio Music Festival audience in Las Vegas that the band’s set was being cut short.

“One minute left, one minute (expletive) left,” Armstrong said. “You’re gonna give me (expletive) one minute? … I’m not (expletive Justin Bieber, you (expletives)!” (Bieber was not on the lineup).

To punctuate his remarks, Armstrong walked off the stage and – in true rock ’ n’ roll fashion – smashed his guitar before exiting.

Following Armstrong’s meltdown, Green Day issued a statement saying Clear Channel did not cut the band’s set short. One day later, a Green Day representative announced that Armstrong was to undergo treatment for substance abuse.

Although the band canceled appearances in San Francisco and New Orleans’ Voodoo Experience following the Las Vegas incident, today’s announcement is the first indication that the band will be missing more than a couple of gigs.

Canceled are the band’s small-venue shows scheduled for the remainder of 2012. Postponed is every date originally scheduled for January and February, effectively putting on hold the tour that was to begin in Green Bay, Wis., Jan. 7.

Still on the books is the band’s Euro run of arenas and festivals, scheduled to begin June 1 in London.

“Obviously the timing for this isn’t ideal, but Billie Joe’s well-being is our main concern,” Green Day’s Mike Dirnt said. “We are happy to say that Billie Joe is doing well, and we want to thank you all for the outpouring of support and well wishes that we have received, and we can’t wait to see you all again soon.”

To compensate for the bad news, Green Day has moved up the release of Green Day ¡Tré!. Originally scheduled to drop Jan. 15, the album will now land in stores Dec. 11.

For more information, visit GreenDay.com.