Board Thread:Support Requests - Getting Technical/@comment-1526346-20180126124928/@comment-9605025-20180126163154

That is because it doesn't do what you think. That option shows the last revision prior to the specified date; it is selecting which revision to show, not which page to show. Therefor, if a page is more than 30 days old, it will be shown; what may not be shown is the latest version.