39 weeks.
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There are 17 weeks and 3 days between September 1 and January 1.
Between January 1, 2009 and September 20, 2009 there are 34 weeks and 5 days.
How many weeks between September 27, 2010 and June 30, 2011
32 weeks (rounded down).
In September there are 4 weeks, in October about 5, in November 4, in December 5, in January 4, in Februar,4, in March 4, in April, 4, in May 4, so from September to June there are 38 weeks.