Date when the URL was accessed. Should not be wikilinked. Used in wikipedia Citation template.
Full date when original URL was accessed; use the same format as other access and archive dates in the citations; requires url.[date 1] Do not wikilink. Not required for web pages or linked documents that do not change; mainly for use of web pages that change frequently or have no publication date. Can be hidden or styled by registered editors.From: http://en.wikipedia.org/wiki/Template:Cite_book