Allows publishers to easily customize the publication year of posts and pages.
After installing and activating the plugin (http://codex.wordpress.org/Managing_Plugins), visit Settings > Advanced Dates. There, publishers can chose to either adjust dates site-wide or on a page-by-page and post-by-post basis. If a publisher choses the latter, s/he'll be able to selectively (de)activate the plugin, customize the annual differential, and (un)freeze dates on each page/post's editing screen.
Please note that the plugin will not take effect, even after activation, until a publisher chooses one of the two options in the Settings > Advanced Dates admin screen.