13 weeks
A little over 74 weeks are between 1st March 2011 and 1st August 2012.
45 weeks and 1 day.
12 weeks 5 days
Including the start and end date in the calculation, there are 30 weeks between the two dates.
Since this is just one year, there are 52 weeks from May 2011 to May 2012.
A little over 12 weeks from 1st January 2011 until 31st March 2011.
52 weeks and 1 day.
There are 56.5 weeks between August 1, 2011 and August 31, 2012.
11 weeks and 5 days.
34 weeks and 6 days.
122 days until march the 23rd 2011
21 weeks and 6 days.