Module:Infobox/dates/doc

Usage

 * - formats the date range.
 * - checks if the values of first_aired, released, aired, released_date are not passed via and if the value of last_aired is not passed via  (or is not present, where relevant). If they aren't, the function returns the default error category, Category:Pages using infobox television with nonstandard dates or the error category from error_category if used.