Subtracting 21 weeks from February 9, 2011 gives September 15, 2010.
23 February 2011
February 15, 2011
Monday, February 14, 2011
February 2 2011
June 4
March 3 2011 is the date 11 weeks before May 19 2011.
90 days before February 6th 2011 is Monday, November 8, 2010.
11 weeks from November 30 2010 is Tuesday, February 15, 2011.
Thursday the 19th of January 2012 is 12 weeks after it and the 4th of August 2011 was 12 weeks before it.
Tuesday, January 15, 2013
From the date the question was asked, 27th of August 2012, 40 weeks before that would be the 21st of November 2011.
The question was asked on the 14th of February 2014. 27 weeks before that was the 9th of August 2013.