Just been reading a fantastic paper by Julie Proctor calling for eBook providers and publishers to come clean and be a bit more honest with their (actual) publication dates.
Proctor, J. (2013). How Old is That Ebook: A Call for Standardization in Publisher-Provided Ebook Publication Dates. Journal of Electronic Resources Librarianship, 25(2), 100-114. doi: 10.1080/1941126X.2013.785288