Need assistance with hash of arrays and injecting values

I'm creating a class that will run a number of tasks based on a start
and end date.  It only runs between week 4 and week 15 of my current
system.

A current hash of arrays is defined for the current calendar year the
tasks run.

@h = {
  :week_four => ["2010-09-20", "2010-09-26"],
  :week_five => ["2010-09-27", "2010-10-03"],
  :week_six => ["2010-10-04", "2010-10-10"],
  :week_seven => ["2010-10-11", "2010-10-17"],
  :week_eight => ["2010-10-18", "2010-10-24"],
  :week_nine => ["2010-10-25", "2010-10-31"],
  :week_ten => ["2010-11-01", "2010-11-07"],
  :week_eleven => ["2010-11-08", "2010-11-14"],
  :week_twelve => ["2010-11-15", "2010-11-21"],
  :week_thirteen => ["2010-11-22", "2010-11-28"],
  :week_fourteen => ["2010-11-29", "2010-12-05"],
  :week_fifteen => ["2010-12-06", "2010-12-12"]
}

I want to inject these into a similar task:

@current_week is an instance variable within the class that holds the
current week (i.e. week 10 for instance so '10')

@weekly_report is defined as an array that will hold the report
listings.

The VirtualReport.reportlistings method takes two dates - a start date
and an end date.  I only want them to run up to the current week.  So,
in this example, if it's week 10, it should run a report for week
4,5,6,7,8,9, and 10.  But, it should not run a report for
11,12,13,14,15.  Furthermore, it should check to ensure that the data is
not empty.

for i in 0..(@current_week-4)
  @weekly_report = VirtualReport.reportlistings("INSERT HASH VALUES")
end

Where I placed the INSERT HASH VALUES above is where I want to inject my
values based on the current week.  Therefore, I'm pretty certain the
hash needs to be ordered or sorted so that they maintain the current
week layouts.  But, I'm not very good with hashes in general and could
use some help or a better example of how to accomplish this task.  The
weekly reports will be stored in an array and used later on in the
class.

Any help would be appreciated.

Thanks,

JD
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