It is the date an article was published. It usually appears at the top or bottom of the article.
I'm not sure the specific date but it was published sometime in 2005.
publication date or release date
If an article doesn't have an author listed, you can use the name of the organization or website where the article is published in place of the author. For articles without a published date, use "n.d." (no date) in your citation to indicate that the date is not available.
It was published on 17th December 1843
It was published in 2003
The U.S. Constitution was published for the first time on this date.
1234
November 2006.
1990
The "World Book Millennium 2000" was published in 1999 as part of the preparation for the year 2000. It aimed to provide information and insights into the new millennium and its significance.
If the website does not post it, then look for any copyright date and use the latest (newest) date. For example, if the copyright says, 'website.com - Copyright 2002-2007', then the published date of the website is 2007.
That is the last date in which the book was published or sent to print.