Display a duration as a readable string

readable.rb

require 'action_view'

include ActionView::Helpers::DateHelper

def readable(seconds)
  case seconds
    when 86400*3..86400*7
      (Time.now - seconds).strftime('%A').downcase
    when 86400*7..86400*14
      'just over a week ago'
    when 86400*14..86400*28
      "#{(seconds / 604800).to_i} weeks ago"
    else
      time_ago_in_words(Time.now - seconds) + ' ago'
  end
end