# File lib/merb-core/controller/mixins/conditional_get.rb, line 65
  def last_modified=(time)
    time = time.to_time if time.is_a?(DateTime)
    # time.utc.strftime("%a, %d %b %Y %X") if we could rely on locale being American
    headers[Merb::Const::LAST_MODIFIED] = time.httpdate
  end