write_datetime

# File activesupport/lib/active_support/message_pack/extensions.rb, line 138
      def write_datetime(datetime, packer)
        packer.write(datetime.jd)
        packer.write(datetime.hour)
        packer.write(datetime.min)
        packer.write(datetime.sec)
        write_rational(datetime.sec_fraction, packer)
        write_rational(datetime.offset, packer)
      end