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Anonymous Monk
The question you ask <i>is</i> ambiguous: September 2013 begins on a Saturday and ends the following Sunday ... how many weeks, to you, is that? You might say six, or you might say four. Date-calculation routines are available in abundance on CPAN, but first you must nail-down the exact meaning of the question <em>for you.</em> See for example [mod://Date::Calc], [mod://Date::Manip] for the math heavy-lifting.
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