diff --git a/wp-admin/options-general.php b/wp-admin/options-general.php
index 5834c8a9d7..a656922594 100644
--- a/wp-admin/options-general.php
+++ b/wp-admin/options-general.php
@@ -285,7 +285,7 @@ if ( empty( $tzstring ) ) { // Create a UTC+- zone if no timezone string exists.
 	?>
 	<br />
 	<?php
-	if ( in_array( $tzstring, timezone_identifiers_list(), true ) ) {
+	if ( in_array( $tzstring, timezone_identifiers_list( DateTimeZone::ALL_WITH_BC ), true ) ) {
 		$transitions = timezone_transitions_get( timezone_open( $tzstring ), time() );
 
 		// 0 index is the state at current time, 1 index is the next transition, if any.
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 9a1b0bd135..c7d8bfa9e3 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.1-alpha-54236';
+$wp_version = '6.1-alpha-54237';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.