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$recently_updated_page = new WP_Query( [
		'post_type'      => [ 'page' ],
		'posts_per_page' => 1,
		'orderby'        => 'modified',
		'no_found_rows'  => true,
] );
if( $recently_updated_page->have_posts() ) :
	while( $recently_updated_page->have_posts() ) : $recently_updated_page->the_post();
		$latest = get_the_modified_date( 'j. m. Y', $post );
	endwhile;
endif;
wp_reset_postdata();