diff -r 34716fd837a4 -r be944660c56a wp/wp-includes/blocks/calendar.php
--- a/wp/wp-includes/blocks/calendar.php	Tue Dec 15 15:52:01 2020 +0100
+++ b/wp/wp-includes/blocks/calendar.php	Wed Sep 21 18:19:35 2022 +0200
@@ -31,12 +31,10 @@
 		}
 	}
 
-	$custom_class_name = empty( $attributes['className'] ) ? '' : ' ' . $attributes['className'];
-	$align_class_name  = empty( $attributes['align'] ) ? '' : ' ' . "align{$attributes['align']}";
-
-	$output = sprintf(
-		'<div class="%1$s">%2$s</div>',
-		esc_attr( 'wp-block-calendar' . $custom_class_name . $align_class_name ),
+	$wrapper_attributes = get_block_wrapper_attributes();
+	$output             = sprintf(
+		'<div %1$s>%2$s</div>',
+		$wrapper_attributes,
 		get_calendar( true, false )
 	);