# File lib/active_support/values/time_zone.rb, line 377
      def [](arg)
        case arg
          when String
            ZONES_MAP[arg]
          when Numeric, ActiveSupport::Duration
            arg *= 3600 if arg.abs <= 13
            all.find { |z| z.utc_offset == arg.to_i }
          else
            raise ArgumentError, "invalid argument to TimeZone[]: #{arg.inspect}"
        end
      end