I've seen a few creators come under HEAVY critisism for changing the dates in their SEO. I've noticed a lot of audience have called out creators for "manipulating" data and "manipulating audiences" by "faking" dates because they edited dates in titles and tags in the hopes of being searched for in a new year. like I've seen some "how to grow a YouTube channel in 2019" and then the creator changes it to "how to grow a YouTube channel in 2020" in the hopes of boosting rankings via using already established rankings and views.
I'm not sure how I sit on that one personally. It's a morally iffy area for me. I think in that regard, if you want to change a date, you're better off making new contant that's relevant and NEW.