How do you get the datetime an user favorited a tweet?


When I look at someone’s favorites, there is a timestamp (xx minutes ago, etc), but I think the interval refers to the tweet’s created_at time, not at the time where the user favorited it. Am I right? If so, if that someone’s favorites get updated, you get the new favorites ordered by its creation time, not the favorited one, and I was wondering me if there is a way to know this last one (but I think it’s not possible).