Copyright notices for open source projects
So what date should you use?
There’s precedent for this practice. If you ever look at the copyright page of a book, it will likely say copyright 2001, 2004, 2006-2007, etc., noting each year of publication. Here, the same legal theory is at play, with the digital project being unbridled from the confines of the physical world, and thus publishing a bit more frequently, likely being “published”, the year the project was started, and every year thereafter.