Feeds: Do not translate the `lastBuildDate` field in RSS feeds.

Props stevenkword, dd32.
Fixes #39141


git-svn-id: https://develop.svn.wordpress.org/trunk@39613 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/feed-atom-comments.php

@@ -43,7 +43,7 @@ do_action( 'rss_tag_pre', 'atom-comments' );
 
 	<updated><?php
 		$date = get_lastcommentmodified( 'GMT' );
-		echo $date ? mysql2date( 'Y-m-d\TH:i:s\Z', $date ) : date( 'Y-m-d\TH:i:s\Z' );
+		echo $date ? mysql2date( 'Y-m-d\TH:i:s\Z', $date, false ) : date( 'Y-m-d\TH:i:s\Z' );
 	?></updated>
 
 <?php if ( is_singular() ) { ?>

src/wp-includes/feed-atom.php

@@ -32,7 +32,7 @@ do_action( 'rss_tag_pre', 'atom' );
 
 	<updated><?php
 		$date = get_lastpostmodified( 'GMT' );
-		echo $date ? mysql2date( 'Y-m-d\TH:i:s\Z', $date ) : date( 'Y-m-d\TH:i:s\Z' );
+		echo $date ? mysql2date( 'Y-m-d\TH:i:s\Z', $date, false ) : date( 'Y-m-d\TH:i:s\Z' );
 	?></updated>
 
 	<link rel="alternate" type="<?php bloginfo_rss('html_type'); ?>" href="<?php bloginfo_rss('url') ?>" />

src/wp-includes/feed-rss2-comments.php

@@ -49,7 +49,7 @@ do_action( 'rss_tag_pre', 'rss2-comments' );
 	<description><?php bloginfo_rss("description") ?></description>
 	<lastBuildDate><?php
 		$date = get_lastcommentmodified( 'GMT' );
-		echo $date ? mysql2date( 'r', $date ) : date( 'r' );
+		echo $date ? mysql2date( 'r', $date, false ) : date( 'r' );
 	?></lastBuildDate>
 	<sy:updatePeriod><?php
 		/** This filter is documented in wp-includes/feed-rss2.php */

src/wp-includes/feed-rss2.php

@@ -44,7 +44,7 @@ do_action( 'rss_tag_pre', 'rss2' );
 	<description><?php bloginfo_rss("description") ?></description>
 	<lastBuildDate><?php
 		$date = get_lastpostmodified( 'GMT' );
-		echo $date ? mysql2date( 'D, d M Y H:i:s +0000', $date ) : date( 'D, d M Y H:i:s +0000' );
+		echo $date ? mysql2date( 'D, d M Y H:i:s +0000', $date, false ) : date( 'D, d M Y H:i:s +0000' );
 	?></lastBuildDate>
 	<language><?php bloginfo_rss( 'language' ); ?></language>
 	<sy:updatePeriod><?php

tests/phpunit/tests/feed/rss2.php

@@ -135,6 +135,33 @@ class Tests_Feeds_RSS2 extends WP_UnitTestCase {
 		$this->assertEquals( strtotime( get_lastpostmodified() ), strtotime( $pubdate[0]['content'] ) );
 	}
 
+	/**
+	 * Test that translated feeds have a valid listed date.
+	 * @group 39141
+	 */
+	function test_channel_pubdate_element_translated() {
+		$original_locale = $GLOBALS['wp_locale'];
+		/* @var WP_Locale $locale */
+		$locale = clone $GLOBALS['wp_locale'];
+
+		$locale->weekday[2] = 'Tuesday_Translated';
+		$locale->weekday_abbrev[ 'Tuesday_Translated' ] = 'Tue_Translated';
+
+		$GLOBALS['wp_locale'] = $locale;
+
+		$this->go_to( '/?feed=rss2' );
+		$feed = $this->do_rss2();
+
+		// Restore original locale.
+		$GLOBALS['wp_locale'] = $original_locale;
+
+		$xml = xml_to_array( $feed );
+
+		// Verify the date is untranslated.
+		$pubdate = xml_find( $xml, 'rss', 'channel', 'lastBuildDate' );
+		$this->assertNotContains( 'Tue_Translated', $pubdate[0]['content'] );
+	}
+
 	/**
 	 * @ticket UT32
 	 */