according to this it's a year on from the last season, 3 years on since the show started but only 2 years from Rogue One/ANH. Guessing Ezra is now 17 or 18, depending on which side of Empire Day this episode was?
According to the official episode guide for the episode, in the Trivia Gallery, it's only 6 months since the end of last season.
Guessing that's the real canon answer