When posts get curated, we show the time of curation. Hover over the date to get both dates. We have gotten lots of complaints both ways (when we didn't do this, people complained that they are seeing weirdly old posts on the frontpage and didn't understand why they are seeing these posts). My guess is at some point we will figure out a way to have it be less confusing, but this was the slightly less confusing option of the two, at least based on "rate of complaints".