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

# modulus is your friend! this works because of the way ruby 
# modulus behaves when the dvidend is negative.
def friday_after(date)
 date +(5 -date.cwday) % 7
end

# Returns all the Fridays between today and the date specified.
def fridays_until(date)
  friday = friday_after(Date.today)
  fridays = []
  while friday <= date
    fridays << friday
    friday += 7.days
  end
  fridays
end
 
future_date = Date.civil(y=2011, m=9, d=21)
fridays = fridays_until(future_date)
puts "Make the most of the next #{fridays.size} weekends until, "+future_date.to_s(:long)
fridays.each{ |friday| puts "From: Fri #{friday.to_s} to Sun #{(friday.end_of_week).to_s}" }

Like this. Will encorporate back into the original later on.