How can I tell when the pages from the Wayback Machine were archived?
The Internet Archive assigns a URL to each archived page on its site in the format http://web.archive.org/web/[Year in yyyy][Month in mm][Day in dd][Time code in hh:mm:ss]/[Archived URL]. Thus, the Internet Archive URL http://web.archive.org/web/19970126045828/http://www.archive.org/ would be the URL for the record of the Internet Archive home page (http://www.archive.org/) archived on January 26, 1997, at 4:58 a.m. and 28 seconds (1997/01/26 at 04:58:28). Typically, a printout from a Web browser will show the URL in the footer. If a website is designed with “frames,” the date assigned by the Internet Archive applies to the frameset as a whole, and not the individual pages within each frame.