I remember reading once that if you time traveled back to Europe anywhere beyond 200 years, the majority of people would not know what year it was. All they understood was summer winter summer winter, someone born two years ago, someone died five years ago, that’s it.
The church kept track of Holy days but even that was an ongoing controversy with everyone.
You could go back to 1123 and there might be a hundred people that kept track of the year but even they wouldn’t agree with one another.