Warner Bros. has purchased spec script THE DAYS BEFORE by writer Chad St. John, per VARIETY. They have set up the project with 300 producer Gianni Nunnari at his Hollywood Gang shingle.

Craig Flores of Hollywood Gang will exec produce on the film, which follows a group of aliens invading Earth by traveling backwards through time and wiping out humanity -- yesterday by yesterday -- while one man stays a yesterday ahead of them, trying to convince the world that the end is coming.

Nunnari is teaming with fellow 300 producer Mark Canton of Canton Productions on WAR OF THE GODS from Relativity Media. St. John also wrote THE FURTHER ADVENTURES OF DOC HOLIDAY for Bruce Willis.