rss_test.xml

<?xml version="1.0"?>
<rss version="2.0">
  <channel>
    <title>title</title>
    <link>http://example.com</link>
    <description>subtitle</description>
    <lastBuildDate>Tue, 01 Jan 2019 00:200:00 +0900</lastBuildDate>
        <item>
            <title>title RFC1123Z</title>
            <link>http://example.com</link>
            <description>summary_content</description>
            <pubDate>Tue, 01 Jan 2019 00:00:00 +0900</pubDate>
            <guid isPermalink="false">id</guid>
            <author>name</author>
            <enclosure url="http://example.com/image.png" type="image/png" length="0" />
        </item>
        <item>
            <title>title RFC1123</title>
            <link>http://example.com</link>
            <description>summary_content</description>
            <pubDate>Tue, 01 Jan 2019 00:00:00 JST</pubDate>
            <guid isPermalink="false">id</guid>
            <author>name</author>
            <enclosure url="http://example.com/image.png" type="image/png" length="0" />
        </item>
  </channel>
</rss>