When was a webpage modified?

Working out the date of a web page can be useful (especially for prior art in patent cases, and for evidence in litigation), but it can also be difficult. Most of the time a useful page has a date on it of some kind which may be reliable. For others the Wayback Machine helps perhaps about half the time but it hasn’t got perfect coverage. There’s another tool that can sometimes This is mainly directed to static web content, i.e. content stored as files on a server. A lot of web content is generated dynamical