In January 2012 there were 4 weeks and 3 days.
12 weeks.
15 weeks and 6 days.
A little over 7 weeks to 1st Jan 2011.
22-Jan-2012
That would be 16 weeks.
26 weeks
28 weeks.
There is about 30 weeks in the time span.
There were 52 weeks and 2 days in 2012.
52 weeks/year 2012 years * 52 weeks/year = 104624 weeks
21.6 weeks
A little over 13 weeks between Jan 1 and April 5 2009.