[Mystvan]

I am assuming you’ve changed it to a future date.

I realized that many Browsers have something I would define as a “Unified Browser History”.

And what does that mean? This means that if you have visited a site in the past and now in the present and perhaps in the future (by changing the date), the search for that site in Browser History will only include the most recent, latest visit (in the future date).

However, in the case of Chrome and Opera, the Browser History is more separate. In other words, each day has its own History. So, if you do a search of this site in Browser History, your visits will be shown in each past, present and future date.

So in the case of Firefox (SeaMonkey, Microsoft Edge, etc.), if you manually delete all your visits on sites in the future date (changed) in Browser History, your Browser History will probably be normalized.