Weeks are normally counted from Mondays, so as there are 5 Mondays in January 2011 and 4 in February, there are 9 weeks.
However, as the last Monday in February is also the last day of February, there are really only 8 weeks (and 3 days) in January and February 2011.
8 weeks and 2 days.
There are 4 weeks in January 2011
From the beginning of February, 2011 through the end of August, 2011 was 30 weeks and 1 day. From the beginning of January, 2011 through the end of September, 2011 was 38 weeks and 6 days.
4 weeks and 2 days.
On the day this question is being answered (Thursday January 31st 2013), it is 102 weeks and 2 days since Tuesday the 15th of February 2011.On the day this question is being answered (Thursday January 31st 2013), it is 102 weeks and 2 days since Tuesday the 15th of February 2011.On the day this question is being answered (Thursday January 31st 2013), it is 102 weeks and 2 days since Tuesday the 15th of February 2011.On the day this question is being answered (Thursday January 31st 2013), it is 102 weeks and 2 days since Tuesday the 15th of February 2011.On the day this question is being answered (Thursday January 31st 2013), it is 102 weeks and 2 days since Tuesday the 15th of February 2011.On the day this question is being answered (Thursday January 31st 2013), it is 102 weeks and 2 days since Tuesday the 15th of February 2011.On the day this question is being answered (Thursday January 31st 2013), it is 102 weeks and 2 days since Tuesday the 15th of February 2011.On the day this question is being answered (Thursday January 31st 2013), it is 102 weeks and 2 days since Tuesday the 15th of February 2011.On the day this question is being answered (Thursday January 31st 2013), it is 102 weeks and 2 days since Tuesday the 15th of February 2011.On the day this question is being answered (Thursday January 31st 2013), it is 102 weeks and 2 days since Tuesday the 15th of February 2011.On the day this question is being answered (Thursday January 31st 2013), it is 102 weeks and 2 days since Tuesday the 15th of February 2011.
Exactly four weeks.
There are 26 weeks (and 3 days) between August 2010 to February 1 2011.
There are 25 days from January 20, 2011 to February 14, 2011.
20 days from January 20th to February 9th 2011.
26
52 weeks and 1 day.
A little over 21 weeks between January 1 2011 and June 1 2011.