Sorry, I don't believe the Manual of Style supports your edits.  Wikipedia:Manual of Style (dates and numbers)#Date formatting says:
"If the date does not contain a day and a month, date preferences will not work, and square brackets will not respond to your readers' auto-formatting preferences. So unless there is a special relevance of the date link, there is no need to link it."
You modified four dates.  Three of them were full dates, the kind which I believe the MOS says you should leave wikilinked.