you can go to this website to find out
http://www.imdb.com/title/tt1017451/releaseinfo
heres the list anyway
Country Date
New Zealand 2010
USA 24 January 2010 (Sundance Film Festival) (premiere)
USA 28 January 2010 (Madison, Wisconsin)
USA 25 February 2010 (Fusion Film Festival)
USA 13 March 2010 (Women with Vision)
Canada 14 March 2010 (Toronto)
USA 18 March 2010 (South by Southwest Film Festival)
Canada 19 March 2010 (limited)
USA 19 March 2010 (limited)
Canada 9 April 2010
USA 9 April 2010
Taiwan 16 April 2010
Argentina 22 April 2010
Singapore 6 May 2010
Iceland 28 May 2010
Estonia 11 June 2010
Hong Kong 17 June 2010
Australia 15 July 2010
Mexico 6 August 2010
Spain 10 September 2010
Finland 24 September 2010
Brazil 30 September 2010
Netherlands 30 November 2010