Those dates are 260 days apart.
As today is February 9, 2010 there have been 180 days since August 13, 2009.
47 weeks since April 27 2009 until March 22 2010.
July or August 2009 there's no sure answer.
Mercy - 2009 I Have a Date 1-14 was released on: Canada: 10 February 2010 USA: 31 March 2010 Netherlands: 6 April 2010 Australia: 7 April 2010 Hungary: 11 August 2010 Japan: 23 November 2010 Finland: 24 August 2012
Kings - 2009 Judgment Day 1-6 was released on: USA: 18 April 2009 Ireland: 7 August 2009 Australia: 7 April 2010 Hungary: 30 May 2010 Finland: 2 April 2011
CSI Crime Scene Investigation - 2000 Mascara 9-18 was released on: Canada: 2 April 2009 USA: 2 April 2009 UK: 12 May 2009 Hungary: 6 August 2009 Germany: 8 April 2010 Japan: 21 August 2010 Belgium: 2011
The 9th of December 2009 was 120 days before it. The 6th of August 2010 was 120 days after it.
90210 - 2008 The Dionysian Debacle 1-21 was released on: Canada: 28 April 2009 USA: 28 April 2009 Netherlands: 11 August 2009 Hungary: 5 December 2009 Japan: 21 August 2010 Germany: 20 September 2010
Castle - 2009 Always Buy Retail 1-6 was released on: Canada: 13 April 2009 USA: 13 April 2009 Australia: 21 June 2009 Belgium: 28 October 2009 Germany: 13 March 2010 Japan: 19 April 2010 UK: 12 May 2010 Finland: 2 June 2010 Hungary: 24 August 2010
Castle - 2009 A Chill Goes Through Her Veins - 1.5 was released on: Canada: 6 April 2009 USA: 6 April 2009 Australia: 14 June 2009 Belgium: 21 October 2009 Germany: 6 March 2010 Japan: 12 April 2010 UK: 5 May 2010 Finland: 26 May 2010 Hungary: 17 August 2010
The Architect - 2009 I was released on: France: April 2010 (TV premiere) USA: 20 August 2010 (TV premiere) Turkey: November 2010 (TV premiere)
90210 - 2008 Okaeri Donna 1-19 was released on: Canada: 14 April 2009 USA: 14 April 2009 Ireland: 7 May 2009 Netherlands: 4 August 2009 Hungary: 21 November 2009 Japan: 7 August 2010 Germany: 6 September 2010