diff -r c7c34916027a -r 177826044cd9 wp/wp-includes/feed-rss2.php
--- a/wp/wp-includes/feed-rss2.php	Mon Oct 14 18:06:33 2019 +0200
+++ b/wp/wp-includes/feed-rss2.php	Mon Oct 14 18:28:13 2019 +0200
@@ -5,10 +5,10 @@
  * @package WordPress
  */
 
-header('Content-Type: ' . feed_content_type('rss2') . '; charset=' . get_option('blog_charset'), true);
+header( 'Content-Type: ' . feed_content_type( 'rss2' ) . '; charset=' . get_option( 'blog_charset' ), true );
 $more = 1;
 
-echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>';
+echo '<?xml version="1.0" encoding="' . get_option( 'blog_charset' ) . '"?' . '>';
 
 /**
  * Fires between the xml and rss tags in a feed.
@@ -40,14 +40,12 @@
 <channel>
 	<title><?php wp_title_rss(); ?></title>
 	<atom:link href="<?php self_link(); ?>" rel="self" type="application/rss+xml" />
-	<link><?php bloginfo_rss('url') ?></link>
-	<description><?php bloginfo_rss("description") ?></description>
-	<lastBuildDate><?php
-		$date = get_lastpostmodified( 'GMT' );
-		echo $date ? mysql2date( 'r', $date, false ) : date( 'r' );
-	?></lastBuildDate>
+	<link><?php bloginfo_rss( 'url' ); ?></link>
+	<description><?php bloginfo_rss( 'description' ); ?></description>
+	<lastBuildDate><?php echo get_feed_build_date( 'r' ); ?></lastBuildDate>
 	<language><?php bloginfo_rss( 'language' ); ?></language>
-	<sy:updatePeriod><?php
+	<sy:updatePeriod>
+	<?php
 		$duration = 'hourly';
 
 		/**
@@ -59,8 +57,10 @@
 		 *                         'yearly'. Default 'hourly'.
 		 */
 		echo apply_filters( 'rss_update_period', $duration );
-	?></sy:updatePeriod>
-	<sy:updateFrequency><?php
+	?>
+	</sy:updatePeriod>
+	<sy:updateFrequency>
+	<?php
 		$frequency = '1';
 
 		/**
@@ -72,52 +72,54 @@
 		 *                          of RSS updates within the update period. Default '1'.
 		 */
 		echo apply_filters( 'rss_update_frequency', $frequency );
-	?></sy:updateFrequency>
+	?>
+	</sy:updateFrequency>
 	<?php
 	/**
 	 * Fires at the end of the RSS2 Feed Header.
 	 *
 	 * @since 2.0.0
 	 */
-	do_action( 'rss2_head');
+	do_action( 'rss2_head' );
 
-	while( have_posts()) : the_post();
-	?>
+	while ( have_posts() ) :
+		the_post();
+		?>
 	<item>
-		<title><?php the_title_rss() ?></title>
-		<link><?php the_permalink_rss() ?></link>
-<?php if ( get_comments_number() || comments_open() ) : ?>
+		<title><?php the_title_rss(); ?></title>
+		<link><?php the_permalink_rss(); ?></link>
+		<?php if ( get_comments_number() || comments_open() ) : ?>
 		<comments><?php comments_link_feed(); ?></comments>
-<?php endif; ?>
-		<pubDate><?php echo mysql2date('D, d M Y H:i:s +0000', get_post_time('Y-m-d H:i:s', true), false); ?></pubDate>
-		<dc:creator><![CDATA[<?php the_author() ?>]]></dc:creator>
-		<?php the_category_rss('rss2') ?>
+		<?php endif; ?>
+		<pubDate><?php echo mysql2date( 'D, d M Y H:i:s +0000', get_post_time( 'Y-m-d H:i:s', true ), false ); ?></pubDate>
+		<dc:creator><![CDATA[<?php the_author(); ?>]]></dc:creator>
+		<?php the_category_rss( 'rss2' ); ?>
 
 		<guid isPermaLink="false"><?php the_guid(); ?></guid>
-<?php if (get_option('rss_use_excerpt')) : ?>
+		<?php if ( get_option( 'rss_use_excerpt' ) ) : ?>
 		<description><![CDATA[<?php the_excerpt_rss(); ?>]]></description>
-<?php else : ?>
+		<?php else : ?>
 		<description><![CDATA[<?php the_excerpt_rss(); ?>]]></description>
-	<?php $content = get_the_content_feed('rss2'); ?>
-	<?php if ( strlen( $content ) > 0 ) : ?>
+			<?php $content = get_the_content_feed( 'rss2' ); ?>
+			<?php if ( strlen( $content ) > 0 ) : ?>
 		<content:encoded><![CDATA[<?php echo $content; ?>]]></content:encoded>
 	<?php else : ?>
 		<content:encoded><![CDATA[<?php the_excerpt_rss(); ?>]]></content:encoded>
 	<?php endif; ?>
-<?php endif; ?>
-<?php if ( get_comments_number() || comments_open() ) : ?>
-		<wfw:commentRss><?php echo esc_url( get_post_comments_feed_link(null, 'rss2') ); ?></wfw:commentRss>
+		<?php endif; ?>
+		<?php if ( get_comments_number() || comments_open() ) : ?>
+		<wfw:commentRss><?php echo esc_url( get_post_comments_feed_link( null, 'rss2' ) ); ?></wfw:commentRss>
 		<slash:comments><?php echo get_comments_number(); ?></slash:comments>
-<?php endif; ?>
-<?php rss_enclosure(); ?>
-	<?php
-	/**
-	 * Fires at the end of each RSS2 feed item.
-	 *
-	 * @since 2.0.0
-	 */
-	do_action( 'rss2_item' );
-	?>
+		<?php endif; ?>
+		<?php rss_enclosure(); ?>
+		<?php
+		/**
+		 * Fires at the end of each RSS2 feed item.
+		 *
+		 * @since 2.0.0
+		 */
+		do_action( 'rss2_item' );
+		?>
 	</item>
 	<?php endwhile; ?>
 </channel>