def release_date
      if (node =doc.css('.infobar span.nobr meta[itemprop="datePublished"]')).length > 0
        date = node.first['content']
        if date.match /^\d{4}$/
          "#{date}-01-01"
        else
          Date.parse(date).to_s
        end
      else
        year = doc.at("h1.header .nobr").text[/\d{4}/]
        "#{year}-01-01"
      end
    rescue
      nil
    end
def release_date
      if (node =doc.css('.infobar span.nobr meta[itemprop="datePublished"]')).length > 0
        date = node.first['content']
        if date.match /^\d{4}$/
          "#{date}-01-01"
        else
          Date.parse(date).to_s
        end
      else
        year = doc.at("h1.header .nobr").text[/\d{4}/]
        "#{year}-01-01"
      end
    rescue
      nil
    end
Get release date
 @return [String]