22 weeks and 5 days in a normal year and 22 weeks and 6 days in a leap year.
There are 23 weeks (and 1 day) between January 1st and June 9th (on a 2010 calendar).
21 weeks (rounded down).
26 weeks
28 weeks.
21.6 weeks
A little over 13 weeks between Jan 1 and April 5 2009.
12 weeks.
24 weeks and 5 days.
43 weeks and 3 days.
30 weeks and 4 days.
15 weeks and 6 days.
25 weeks and 6 days.