diff -r 48c4eec2b7e6 -r 8c2e4d02f4ef wp/wp-includes/blocks/comment-date.php
--- a/wp/wp-includes/blocks/comment-date.php	Fri Sep 05 18:40:08 2025 +0200
+++ b/wp/wp-includes/blocks/comment-date.php	Fri Sep 05 18:52:52 2025 +0200
@@ -28,11 +28,13 @@
 	$classes = ( isset( $attributes['style']['elements']['link']['color']['text'] ) ) ? 'has-link-color' : '';
 
 	$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => $classes ) );
-	$formatted_date     = get_comment_date(
-		isset( $attributes['format'] ) ? $attributes['format'] : '',
-		$comment
-	);
-	$link               = get_comment_link( $comment );
+	if ( isset( $attributes['format'] ) && 'human-diff' === $attributes['format'] ) {
+		// translators: %s: human-readable time difference.
+		$formatted_date = sprintf( __( '%s ago' ), human_time_diff( get_comment_date( 'U', $comment ) ) );
+	} else {
+		$formatted_date = get_comment_date( empty( $attributes['format'] ) ? '' : $attributes['format'], $comment );
+	}
+	$link = get_comment_link( $comment );
 
 	if ( ! empty( $attributes['isLink'] ) ) {
 		$formatted_date = sprintf( '<a href="%1s">%2s</a>', esc_url( $link ), $formatted_date );