Template:Cat by year/doc

{{year by cat }}
 * m =
 * c =
 * d =
 * y =
 * cat =
 * sortkey = (this works on the year category or the optional subcategory entered in subcat)
 * in = (optional - if AAA is entered a note will be posted: See also [year] in AAA}
 * parent = (In entered, a the parent category - for example Elections by year - will be automatically entered)
 * subcat = (optional, if omitted cat will be put into the year category)