  :The user you mentioned is active mainly in articles about football and football teams, according to the list of contributions, but I didn't see (or I missed), amidst his recent edits, a similar activity of changing links to dates.  If that is the case, though, this could be a case of sock puppetry.  This is not always prohibited, but using more than one account/IP to break Wikipedia policy or disrupt the project is also grounds for blocking, or even more drastic measures, in extreme cases.   