Custom timestamps in rails

custom_timestamps.rb

module CustomTimestamps
  extend ActiveSupport::Concern

  included do
    class_attribute :custom_updated_at, :custom_created_at
    before_save   :update_custom_updated_at
    before_create :set_custom_created_at
  end

  def update_custom_updated_at
    self.send("#{self.class.custom_updated_at}=", DateTime.now)
  end

  def set_custom_created_at
    self.send("#{self.class.custom_created_at}=", DateTime.now)
  end

  module ClassMethods
    def custom_timestamp_attrs(hash)
      self.custom_updated_at = hash[:custom_updated_at]
      self.custom_created_at = hash[:custom_created_at]
    end
  end
end