Weekends left til the end of summer

weekends.rb

#Author: Ian Moss aka oceanician : http://twitter.com/oceanician
#First Published: https://gist.github.com/1009253
#I'm running as part of a rails project with:
# ruby script/runner lib\weekends.rb

# Returns parameter from_date if it is a Friday.
def next_friday( from_date )
  while from_date.cwday!=5
    from_date = from_date + 1.day
  end
  from_date
end

def weekends_til( end_date )
  weekends = []
  friday_count = next_friday( Date.today )	
  while( friday_count <= end_date )
    weekends << friday_count
    friday_count = friday_count + 7.days
  end
	
  weekends
end
 
#calculate all the weekends from now, until the middle of September.
#I'm running as part of a rails project with:
# ruby script/runner lib\weekends.rb
#future = Date.today + 5.months + 3.weeks
 
# Notionally decided 21st September is the end of Summer!
future = Date.civil(y=2011, m=9, d=21)
weekends=weekends_til(future)

puts "Make the most of the next #{weekends.size} weekends until, "+future.to_s(:long)
weekends.each{|w| puts "From: Fri "+w.to_s+" to Sun " +(w+3.days).to_s}

Wow. Thanks for the feedback. Spent about 15 minutes writing it, and I agree about the tests for sure.
I suppose a detailed comment of what I was trying to achieve would have been useful too.
Initially for creating a list of weekends I can poll mates other availability for. Then, I thought perhaps it could be used to generate doddle.ch questionnaires, then I was thinking maybe I could just create my own app on the side. Either way I thought putting the code 'out there' may actually be of use for others.
Anyways, Thanks loads for the feedback. Wanting to keep my Ruby active, so this will help a lot. I will try to evaluate it properly, and refine it. Cheers :)