In Watchmen and most of its adaptations, Doctor Manhattan has the power to experience all of his life simultaneously. He can be at the formation of the Crimebusters and at his breakup with Silk Spectre II at the same time.
I am aware that DC's Captain Atom was the inspiration for Doctor Manhattan's character as a whole, but what was the inspiration for Dr. Manhattan's time powers? I was reading Kurt Vonnegut's Slaughterhouse-Five, where the protagonist Billy Pilgrim experiences time in a similar way to Doctor Manhattan, but that book was written in the late 1960s.
Has Alan Moore said what the inspiration for that ability was?