What are the release dates for Portal 2 - 2011 VG

Portal 2 - 2011 VG was released on:

Austria: 19 April 2011
Germany: 19 April 2011
Netherlands: 19 April 2011 (PC version) (Mac version)
USA: 19 April 2011
Netherlands: 21 April 2011 (PS3 version) (Xbox360 version)
UK: 21 April 2011