The Fibonacci Promotion Schedule Generator

fib_promo.rb

require 'active_support/time'

start = "2012-11-30"
gens  = 20

def fib_series(accum,limit)
  accum ||= [1,1]
  return accum if accum.length >= limit

  this = accum[-1]
  last = accum[-2]

  fib_series((accum << last + this), limit)
end

dates = fib_series(nil,gens).inject([Date.parse(start)]) do |accumulator,duration|
  accumulator << accumulator.last + duration.days
end

puts dates

20 generations will probably exceed my lifetime, and 60 generations far exceeds the estimated lifetime of the Sun.