From 9d14355bf5722ff601a0ea490dfab0cec0dd01e1 Mon Sep 17 00:00:00 2001
From: Sergey Biryukov <sergeybiryukov.ru@gmail.com>
Date: Thu, 28 Nov 2019 13:42:00 +0000
Subject: [PATCH] Date/Time: Make `get_permalink()` more resilient against PHP
 timezone changes.

Overriding default PHP timezone with `date_default_timezone_set()`, while not recommended, should not inadvertently result in changing existing permalinks.

Add a unit test.

Props Rarst, steevithak, archon810, maciejmackowiak, Ov3rfly, Cybr, hometowntrailers, scvleon, miette49.
Fixes #48623.
Built from https://develop.svn.wordpress.org/trunk@46795


git-svn-id: http://core.svn.wordpress.org/trunk@46595 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/link-template.php | 15 +++++++++------
 wp-includes/version.php       |  2 +-
 2 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/wp-includes/link-template.php b/wp-includes/link-template.php
index 9419633632..5698ded47a 100644
--- a/wp-includes/link-template.php
+++ b/wp-includes/link-template.php
@@ -166,7 +166,6 @@ function get_permalink( $post = 0, $leavename = false ) {
 	$permalink = apply_filters( 'pre_post_link', $permalink, $post, $leavename );
 
 	if ( '' != $permalink && ! in_array( $post->post_status, array( 'draft', 'pending', 'auto-draft', 'future' ) ) ) {
-		$unixtime = strtotime( $post->post_date );
 
 		$category = '';
 		if ( strpos( $permalink, '%category%' ) !== false ) {
@@ -212,9 +211,11 @@ function get_permalink( $post = 0, $leavename = false ) {
 			$author     = $authordata->user_nicename;
 		}
 
-		$date           = explode( ' ', gmdate( 'Y m d H i s', $unixtime ) );
-		$rewritereplace =
-		array(
+		// This is not an API call because the permalink is based on the stored post_date value,
+		// which should be parsed as local time regardless of the default PHP timezone.
+		$date = explode( ' ', str_replace( array( '-', ':' ), ' ', $post->post_date ) );
+
+		$rewritereplace = array(
 			$date[0],
 			$date[1],
 			$date[2],
@@ -227,8 +228,10 @@ function get_permalink( $post = 0, $leavename = false ) {
 			$author,
 			$post->post_name,
 		);
-		$permalink      = home_url( str_replace( $rewritecode, $rewritereplace, $permalink ) );
-		$permalink      = user_trailingslashit( $permalink, 'single' );
+
+		$permalink = home_url( str_replace( $rewritecode, $rewritereplace, $permalink ) );
+		$permalink = user_trailingslashit( $permalink, 'single' );
+
 	} else { // if they're not using the fancy permalink option
 		$permalink = home_url( '?p=' . $post->ID );
 	}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 0f7a300199..000aab4006 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.4-alpha-46793';
+$wp_version = '5.4-alpha-46795';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.