parse_month (TZInfo::TZDataParser)

    # File lib/tzinfo/tzdataparser.rb, line 114
        def self.parse_month(month)
          lower = month.downcase
          if lower =~ /^jan/
            @month = 1
          elsif lower =~ /^feb/
            @month = 2
          elsif lower =~ /^mar/
            @month = 3
          elsif lower =~ /^apr/
            @month = 4
          elsif lower =~ /^may/
            @month = 5
          elsif lower =~ /^jun/
            @month = 6
          elsif lower =~ /^jul/
            @month = 7
          elsif lower =~ /^aug/
            @month = 8
          elsif lower =~ /^sep/
            @month = 9
          elsif lower =~ /^oct/
            @month = 10
          elsif lower =~ /^nov/
            @month = 11
          elsif lower =~ /^dec/
            @month = 12
          else
            raise "Invalid month: #{month}"
          end
        end