53 weeks in 2011; Week 1 is Sun Dec 26 2010 thru Sat Jan 1 2011 and week 53 is Sun 25 Dec through Sat 31 Dec.
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Exactly four weeks.
Since this is just one year, there are 52 weeks from May 2011 to May 2012.
How many weeks between September 27, 2010 and June 30, 2011
none - we are in 2012 now
In any year there are 52 weeks and one day - or two if it is a leap year.