A better function for producing a nice time diff

time_diff.rb

# produces [year, month, day, hour, minute, second]
# from time is the older date
def time_diff(from_time, to_time)
  from_time = from_time.to_time if from_time.respond_to?(:to_time)
  to_time = to_time.to_time if to_time.respond_to?(:to_time)
  components = []
  %w(year month day hour minute second).map do |interval|
    distance_in_seconds = (to_time.to_i - from_time.to_i).round(1)
    delta = (distance_in_seconds / 1.send(interval)).floor
    delta -= 1 if from_time + delta.send(interval) > to_time
    from_time += delta.send(interval)
    components << pluralize(delta, interval)
    delta
  end

  components.join(', ')
end