From 0e55b6ab849695606ff6dffbf030e6d478e94c0d Mon Sep 17 00:00:00 2001
From: spacedmonkey <spacedmonkey@git.wordpress.org>
Date: Fri, 17 Mar 2023 15:58:23 +0000
Subject: [PATCH] Date / Time: Remove usage of mysql2date in generate_postdata
 method.

Remove usage of `mysql2date` in `generate_postdata`. `mysql2date` has a performance overhead, as it creates a `DateTimeZone` object each time it is called. Use a simple
sub string function to generate the values needed for the `currentmonth` and `currentday` global variables.

Props spacedmonkey, Rarst, SergeyBiryukov, flixos90.
Fixes #57683.
Built from https://develop.svn.wordpress.org/trunk@55558


git-svn-id: http://core.svn.wordpress.org/trunk@55070 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/class-wp-query.php | 21 ++++++++++++++++-----
 wp-includes/version.php        |  2 +-
 2 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/wp-includes/class-wp-query.php b/wp-includes/class-wp-query.php
index d5d10e9714..94512908bf 100644
--- a/wp-includes/class-wp-query.php
+++ b/wp-includes/class-wp-query.php
@@ -4714,11 +4714,22 @@ class WP_Query {
 
 		$authordata = get_userdata( $post->post_author );
 
-		$currentday   = mysql2date( 'd.m.y', $post->post_date, false );
-		$currentmonth = mysql2date( 'm', $post->post_date, false );
-		$numpages     = 1;
-		$multipage    = 0;
-		$page         = $this->get( 'page' );
+		$currentday   = false;
+		$currentmonth = false;
+
+		$post_date = $post->post_date;
+		if ( ! empty( $post_date ) && '0000-00-00 00:00:00' !== $post_date ) {
+			// Avoid using mysql2date for performance reasons.
+			$currentmonth = substr( $post_date, 5, 2 );
+			$day          = substr( $post_date, 8, 2 );
+			$year         = substr( $post_date, 2, 2 );
+
+			$currentday = sprintf( '%s.%s.%s', $day, $currentmonth, $year );
+		}
+
+		$numpages  = 1;
+		$multipage = 0;
+		$page      = $this->get( 'page' );
 		if ( ! $page ) {
 			$page = 1;
 		}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index a0c3b24bc8..a2c5f31937 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.3-alpha-55557';
+$wp_version = '6.3-alpha-55558';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.