Generally, I would recommend the custom JS solution. However, UCP wikis (wikis created on or after March 11) currently do not have support for custom JS or DPL. So if your wiki is a UCP wiki, your only current option is the magic words. However, both custom JS and DPL should be added to UCP wikis at some point.
Please note that none of these solutions will place the date in the same place a Wikipedia. The 1st and 3rd options would place it within the article portion of the page while the 2nd option would place it in the article header underneath the article's title.
As far as I know, none of the suggestions above would automatically put time-stamping... it still requires inclusion of a template (or magic word, etc.) or making sure the user doesn't delete the thing that does the timestamping.
That Wikipedia feature is specific to Wikipedia, so FANDOM staff would have to get their developers to add that feature.
Most likely, custom JS could add a timestamp of last edited at the end somewhere on the page, but not on a UCP wiki (meaning we can't help you specifically unless we know what wiki you're trying to do this on). You could ask how that might be coded at the Script Suggestions board on the Dev wiki.
The "PageEditInfo" with "LastEdited" is working nicely, so thanks again. One minor tweak: can this be positioned at the bottom of the page, say, below the "Categories" bar? Or below all text? In other words, what are valid values for "position.element"? Thanks, VJS