This category is for entries that are timelines for a single individual year, i.e. entries in which events during a single specific year are organized chronologically by date; or else, lists or indexes for timelines by year; or else, subcategories that are specifically for timelines by year.
It also includes articles which serve as a list, catalog, or index of timelines by year; i.e. timelines for each and every year within a certain date range, (rather than timelines that span numerous years or decades in one timeline), in order to denote the major events during each of those years.