# File lib/active_support/vendor/tzinfo-0.3.11/tzinfo/timezone_period.rb, line 90
    def utc_total_offset_rational
      unless @utc_total_offset_rational
        @utc_total_offset_rational = OffsetRationals.rational_for_offset(utc_total_offset) 
      end
      @utc_total_offset_rational
    end