Please answer a question about the following article about Madonna (entertainer):

Madonna released her eleventh studio album, Hard Candy, in April 2008. Containing R&B and urban pop influences, the songs on Hard Candy were autobiographical in nature and saw Madonna collaborating with Justin Timberlake, Timbaland, Pharrell Williams and Nate "Danja" Hills. The album debuted at number one in thirty seven countries and on the Billboard 200. Don Shewey from Rolling Stone complimented it as an "impressive taste of her upcoming tour." It received generally positive reviews worldwide though some critics panned it as "an attempt to harness the urban market".

When was Hard Candy released?
April 2008