def update(request)
      timestamp = request.first(options[:field])
      @hour_frequencies[timestamp.to_s[8..9].to_i] += 1
      @first = timestamp if timestamp < @first
      @last  = timestamp if timestamp > @last
    end
def update(request)
      timestamp = request.first(options[:field])
      @hour_frequencies[timestamp.to_s[8..9].to_i] += 1
      @first = timestamp if timestamp < @first
      @last  = timestamp if timestamp > @last
    end
Check if the timestamp in the request and store it.
 <tt>request</tt> The request.