diff --git a/wp-includes/customize/class-wp-customize-date-time-control.php b/wp-includes/customize/class-wp-customize-date-time-control.php
index ac31c418bf..607799768c 100644
--- a/wp-includes/customize/class-wp-customize-date-time-control.php
+++ b/wp-includes/customize/class-wp-customize-date-time-control.php
@@ -227,7 +227,7 @@ class WP_Customize_Date_Time_Control extends WP_Customize_Control {
 
 		if ( $tz_string ) {
 			try {
-				$tz = new DateTimezone( $tz_string );
+				$tz = new DateTimeZone( $tz_string );
 			} catch ( Exception $e ) {
 				$tz = '';
 			}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index dd3b0d12d5..dfbdf05ec1 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-51533';
+$wp_version = '5.9-alpha-51534';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.