The poster of Harry Potter doesn't really have any visuals that show when the movie was made. However the text at the bottom of the image displays the release date as well as it's feature in IMAX.
So the movie is probably a more recent addition to the Harry Potter film saga. In fact, seeing how the text at bottom of the poster also read "IT ALL ENDS," I think it's also safe to assume that it's an ad poster for the final film of the saga. The poster is very dark and mystic, the color scheme and the darkness gives it a science fiction theme. It also goes along with the text and the idea that it's the end (hence the darkness).