w3cdtf() public

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# File lib/rss/rss.rb, line 37
    def w3cdtf
      if usec.zero?
        fraction_digits = 0
      else
        fraction_digits = Math.log10(usec.to_s.sub(/0*$/, '').to_i).floor + 1
      end
      xmlschema(fraction_digits)
    end
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