Ticket #43802: 43802.diff

src/wp-admin/includes/schema.php

@@ -404 +404 @@
          * for all timezone strings supported by PHP.
          */
         $offset_or_tz = _x( '0', 'default GMT offset or timezone string' ); // phpcs:ignore WordPress.WP.I18n.NoEmptyStrings
+
+        /**
+         * Filters the default GMT offset or timezone string.
+         *
+         * @since 5.X.X
+         *
+         * @param string $offset_or_tz The default GMT offset or timezone string.
+         */
+        $offset_or_tz = apply_filters( 'popular_option_timezone_string', $offset_or_tz );
+
         if ( is_numeric( $offset_or_tz ) ) {
                 $gmt_offset = $offset_or_tz;
         } elseif ( $offset_or_tz && in_array( $offset_or_tz, timezone_identifiers_list() ) ) {