The copyright of the year when the book was printed is valid in all next years. The same principle should apply to web pages, too. However "the year when website was created" is a bit different. So, if you make changes to your web site - you are not done yet. read more
Technically, you should update a copyright year only if you made contributions to the work during that year. So if your website hasn't been updated in a given year, there is no ground to touch the file just to update the year. read more
You should auto-update copyright year annually either manually or dynamically using a script or CMS. Static Date Rewriting: You can manually update the copyright year on multiple web pages using a web authoring tool like FrontPage or Dreamweaver. read more