Difference between two dates

diff.rb

require 'rubygems'
require 'active_support/all'

time =  ("2011-08-12 09:00:00").to_time
def diff(time)
  delta = time - Time.now

  %w[days hours minutes].collect do |step|
    seconds = 1.send(step)
    (delta / seconds).to_i.tap do
      delta %= seconds
    end
  end
end

puts diff(time).inspect