Between January 1, 2009 and September 20, 2009 there are 34 weeks and 5 days.
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39 weeks.
There are 17 weeks and 3 days between September 1 and January 1.
Between September 14, 2009 and January 27, 2010 there were 135 days.
Including the start and end date, there were 243 days between January 1 and September 1 2009.
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.