A little over 21 weeks between January 1 2011 and June 1 2011.
34 weeks and 6 days.
It depends if it is a leap year or not.....
From the 23rd of June 2010 to the1st of January 2011 was 27 weeks and 3 days.
21 weeks and 4 days.
A little over 30 weeks between November 1st 2010 to June 1st 2011.
166 days are between January 1 and June 17 of a non-leap year.
26 weeks and 1 day.
about 33 weeks
There are 23 weeks (and 1 day) between January 1st and June 9th (on a 2010 calendar).
43 weeks
52 weeks.
June 2011 contained 4.29 weeks.