<page_title> IMac </page_title> <section_title> Timeline of iMac and Macintosh models </section_title> <table> <cell> October 13, 2015 (21.5") / October 16, 2014 (27") <row_header> Release date </row_header> </cell> </table>
The 21.5-inch iMac was announced in October 2015.