Ticket #48692: 48692.patch

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

@@ -1352 +1352 @@
                 return $result;
         }
 
+        /**
+         * Test if the site is using timezones relative to their location, or by using an offset value.
+         *
+         * Daylight Savings Time (DST) may affect the times used and shown by your site, and using an UTC offset,
+         * instead of a localized timezone, means that the site does not get automatic DST updates.
+         *
+         * This check looks for default or UTC values and recommends changing to a fixed location.
+         *
+         * @since 5.3.1
+         *
+         * @return array The test results.
+         */
+        public function get_test_timezone_not_utc() {
+                $result = array(
+                        'label'       => __( 'Your site uses localized timezones' ),
+                        'status'      => 'good',
+                        'badge'       => array(
+                                'label' => __( 'Performance' ),
+                                'color' => 'blue',
+                        ),
+                        'description' => sprintf(
+                                '<p>%s</p>',
+                                __( 'Daylight Savings Time (DST) may affect the times used and shown by your site, and using an UTC offset, instead of a localized timezone, means that the site does not get automatic DST updates.' )
+                        ),
+                        'actions'     => '',
+                        'test'        => 'timezone_not_utc',
+                );
+
+                $timezone = get_option( 'timezone_string', null );
+
+                if ( empty( $timezone ) || 'UTC' === substr( $timezone, 0, 3 ) ) {
+                        $result['status'] = 'recommended';
+                        $result['label']  = __( 'Your site is not using localized timezones' );
+                        $result['actions'] .= sprintf(
+                                '<p><a href="%s">%s</a></p>',
+                                esc_url( admin_url( 'options-general.php' ) ),
+                                __( 'Update your site timezone' )
+                        );
+                }
+
+                return $result;
+        }
+
         /**
          * Test if your site is serving content over HTTPS.
          *
@@ -1890 +1933 @@
                                         'label' => __( 'Debugging enabled' ),
                                         'test'  => 'is_in_debug_mode',
                                 ),
+                                'timezones'         => array(
+                                        'label' => __( 'Timezone' ),
+                                        'test'  => 'timezone_not_utc',
+                                ),
                         ),
                         'async'  => array(
                                 'dotorg_communication' => array(