Ticket #48692: 48692-php-default-timezone-site-health.patch

src/wp-admin/includes/class-wp-site-health.php

@@ -1828 +1828 @@
                 return $result;
         }
 
+        /**
+         * Test if the default PHP timezone is set to UTC.
+         *
+         * @return array The test results.
+         * @since 5.3.1
+         */
+        public function get_test_php_default_timezone() {
+
+                if ( 'UTC' === date_default_timezone_get() ) {
+
+                        return array(
+                                'label'       => __( 'Default PHP timezone setting is valid' ),
+                                'status'      => 'good',
+                                'badge'       => array(
+                                        'label' => __( 'Performance' ),
+                                        'color' => 'blue',
+                                ),
+                                'description' => sprintf(
+                                        '<p>%s</p>',
+                                        __( 'Default PHP timezone setting was configured by WordPress during load. This is necessary for correct calculations of dates and times.' )
+                                ),
+                                'test'        => 'php_default_timezone',
+                        );
+                }
+
+                return array(
+                        'label'       => __( 'Default PHP timezone setting is invalid' ),
+                        'status'      => 'critical',
+                        'badge'       => array(
+                                'label' => __( 'Performance' ),
+                                'color' => 'red',
+                        ),
+                        'description' => sprintf(
+                                '<p>%s</p>',
+                                __( 'Default PHP timezone setting was changed after WordPress load by a <code>date_default_timezone_set()</code> function call. This interferes with correct calculations of dates and times.' )
+                        ),
+                        'test'        => 'php_default_timezone',
+                );
+        }
+
         /**
          * Return a set of tests that belong to the site status page.
          *
@@ -1890 +1930 @@
                                         'label' => __( 'Debugging enabled' ),
                                         'test'  => 'is_in_debug_mode',
                                 ),
+                                'php_default_timezone'     => array(
+                                        'label' => __( 'PHP Default Timezone' ),
+                                        'test'  => 'php_default_timezone',
+                                ),
                         ),
                         'async'  => array(
                                 'dotorg_communication' => array(