The novella version of this story appeared first, but I don’t know which was written first. Both are well worth reading, but my preference is for the novella which tells the same story in a more direct fashion.
I could say that time is a convention and that all events occur simultaneously.

Variants

(1)
  1. Bring the Jubilee by Ward Moore (Farrar, Straus and Young, 1953).
  2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Ward Moore