こんな感じ。ActiveSupportを使った場合も同じようにできます。
require 'time'
Time.now.iso8601
=> "2014-11-05T21:45:10+09:00"
7.days.ago.iso8601
=> "2014-10-29T21:46:04+09:00"
しかし、ActiveSupport便利！
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