A Total Newb Question about Runt...

I was looking into the runt gem, but it's obvious I'm a total newb.

I want to know if this is possible using runt, and if someone here is
gracious enough to spell it our for a newbie.

I'm trying to figure out how to use runt to calculate a set of dates
( i.e. every monday starting on Sept 1, 2008, and repeating for, say,
8 weeks. ) and then passing those dates into an array named
'somedates', for example.

I realize this may be more of a Ruby than a RoR question. Any help is
greatly appreciated.

require 'date'
d = Date.parse("Sept 1, 2008")
somedates = Array.new(8).map { |x| x = d += 7 }

10.times { puts "I <3 ruby" }