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At one point it is stated that the first invasion happened roughly 100 years before Ender went to Battle School. In the film Ender's Game, the First Invasion takes place in 2086 (as stated on screen). The timeline setup in the movie does not match the timeline in the books. They state that the dates are approximate.
I might have missed it but I don't remember any mention of a year or something that gives a hint in what year the book begins. The only references I recall are about in-universe events like the Second Invasion which took place some 70 to 80 years before Ender's Game. But how long before that did the First Invasion take place and when?