as neither page.php nor content-page.php are using the ‘twentyfourteen_posted_on()’ function, the edited output cannot appear on static pages.
do you need the output of the dates and author on the static pages?
if yes, edit content-page.php, and insert the function at a similar location as it is in content.php;
example:
<?php
/**
* The template used for displaying page content
*
* @package WordPress
* @subpackage Twenty_Fourteen
* @since Twenty Fourteen 1.0
*/
?>
<article id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
<?php
// Page thumbnail and title.
twentyfourteen_post_thumbnail();
?>
<header class="entry-header">
<?php the_title( '<h1 class="entry-title">', '</h1>' ); ?>
<div class="entry-meta">
<?php twentyfourteen_posted_on(); ?>
</div><!-- .entry-meta -->
</header><!-- .entry-header -->
<div class="entry-content">
<?php
the_content();
wp_link_pages( array(
'before' => '<div class="page-links"><span class="page-links-title">' . __( 'Pages:', 'twentyfourteen' ) . '</span>',
'after' => '</div>',
'link_before' => '<span>',
'link_after' => '</span>',
) );
edit_post_link( __( 'Edit', 'twentyfourteen' ), '<span class="edit-link">', '</span>' );
?>
</div><!-- .entry-content -->
</article><!-- #post-## -->