User blog comment:TheBlueRogue/The Witcher 3 "The Trail" Fannotation Trailer/@comment-31.182.83.8-20141029171132/@comment-108.56.199.50-20141030162256

According to the game, The Witcher 1 takes place in 1270... however according to the canon timeline, the first game should take place in 1273 (five years after Geralt is killed in Rivia). If this is incorrectly 1272 based on the incorrect date of Witcher 1 being 1270... one can assume this is meant to take place 2 years after the events of The Witcher 1 and The Witcher 2 (the 2nd game takes place only a few months after the first). So my guess is, according to the canon timeline, this ought to be 1275.

The whole thing could be a flashback, as another commenter says. I doubt that, however, since Yennifer was on her own and in 1272 Geralt should have been in the clutches of the King of the WIld Hunt, according to Letho and Geralt's memories from Witcher 2.