Subtracting 70 weeks from August 7, 2011 gives April 4, 2010.
The 11th of August 2011 was 12 weeks before the 3rd of November 2011 and the 26th of January 2012 was 12 weeks after it.
Thursday the 19th of January 2012 is 12 weeks after it and the 4th of August 2011 was 12 weeks before it.
There are 56.5 weeks between August 1, 2011 and August 31, 2012.
Subtracting 40 weeks from July 15, 2012 gives October 9, 2011.
Adding 12 weeks, that is, 84 days, to August 14, 2011, gives November 6, 2011.
From the date the question was asked, 27th of August 2012, 40 weeks before that would be the 21st of November 2011.
Monday, February 14, 2011
There are 26 weeks (and 3 days) between August 2010 to February 1 2011.
52 weeks and one day.
The 27th of August 2011.
There are a total of 13 weeks and 4 days between May 6 and August 9.
34 weeks and 3 days.