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PHP file to host anywhere
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<?php
//Set your time zone
date_default_timezone_set('Europe/Madrid');

//File where items will be stored
$archivo ='https://dl.dropboxusercontent.com/..../RSS/feed.txt';


$str1 = "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>
<rss version=\"2.0\" xmlns:atom=\"http://www.w3.org/2005/Atom\">
<channel>
<title>Your feed</title>
<link>http://..../feed.xml</link>
<description>Shared RSS</description>
<language>es-es</language>
\r\n<atom:link href=\"http://..../feed.xml\" rel=\"self\" type=\"application/rss+xml\" />";
$str11 = "\r\n<lastBuildDate>".date('D, d M Y H:i:s O')."</lastBuildDate>\r\n";
$str2 = file_get_contents("$archivo");
$str3 = "\r\n</channel></rss>";

$result = $str1 . $str11 . $str2 . $str3;
$xml1 = preg_replace('#&(?=[a-z_0-9]+=)#', '&amp;', $result);
$xml = new SimpleXMLElement($xml1);

foreach ($xml->channel->item as $item) {
 $pubdate = $item->pubDate;

 if (($timestamp = strtotime(str_replace(" at "," ",$pubdate))) === false) {
    $conv = date(DATE_RSS);
} else {
    $conv = date(DATE_RSS, strtotime(str_replace(" at "," ",$pubdate)));
}

$item->pubDate = $conv;
}

// Stores resultant XML file
$xml->asXML ( '/home/..../public_html/feed.xml' );

//Shows XML on screen
echo $xml->asXML();

?>


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TEXT for the recipe content
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&#60;item&#62;<br/>
&#60;title&#62;{{ArticleTitle}}&#60;/title&#62;<br/>
&#60;link&#62;{{ArticleURL}}&#60;/link&#62;<br/>
&#60;description&#62;
&#60;![CDATA[
{{ArticleContent}}
]]&#62;
&#60;/description&#62;<br/>
&#60;source url="{{SourceURL}}"&#62; {{SourceTitle}}&#60;/source&#62;<br/>
&#60;pubDate&#62;{{ArticlePublishedAt}}&#60;/pubDate&#62;<br/>
&#60;/item&#62;<br/>