52 weeks.
A little over 21 weeks between January 1 2011 and June 1 2011.
There are about 134½ weeks between 1 January 2011 and 31 July 2013.
A little over 43 weeks between March 4 2010 and January 5 2011.
26 weeks and 1 day.
43 weeks and 4 days.
44 weeks and 3 days.
34 weeks and 5 days.
39 weeks and 4 days.
34 weeks and 3 days.
34 weeks and 3 days.
In 2011, there were 333 days between January 20th and December 19th.
There are 4 weeks in January 2011