Nah, everything was fine. Let's do the same for loop-single.

wp-content/themes/tn-2014/digest.php

@@ -10,7 +10,7 @@
 					<article id="post-<?php the_ID(); ?>" <?php neuf_post_class(); ?>>
                         <img src="<?php bloginfo( 'stylesheet_directory' ); ?>/img/knapp.png" class="button" />
 						<a class="permalink entry-title" href="<?php the_permalink(); ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a>
-						<div class="entry-meta byline"><span class="entry-date"><?php echo date_i18n( get_option('date_format'), get_post_time('U') ).", ".date_i18n( get_option('time_format'), get_post_time('U') ); ?></span></div>
+						<div class="entry-meta byline"><span class="entry-date"><?php echo date_i18n( get_option('date_format'), get_post_time('U', true) ).", ".date_i18n( get_option('time_format'), get_post_time('U', true) ); ?></span></div>
 						<div class="entry-summary"><?php echo linkify(trim_excerpt(get_the_excerpt(), 30), '/\[\.\.\.\]/', get_permalink()); ?></div>
                     </article>
                 </div>

wp-content/themes/tn-2014/loop-single.php

@@ -5,7 +5,7 @@
 
 				<div class="body">
 
-                    <div class="entry-meta byline"><span class="meta-prep meta-prep-author">av </span><span class="author vcard"><?php the_author_link(); ?></span>, <span class="entry-date"><?php echo date_i18n( get_option('date_format')).", ".date_i18n( get_option('time_format')); ?></span></div>
+                    <div class="entry-meta byline"><span class="meta-prep meta-prep-author">av </span><span class="author vcard"><?php the_author_link(); ?></span>, <span class="entry-date"><?php echo date_i18n( get_option('date_format'), get_post_time('U', true) ).", ".date_i18n( get_option('time_format'), get_post_time('U', true) ); ?></span></div>
 					<?php the_post_thumbnail( 'single' ); ?>
 					<div class="entry-content"><?php the_content(); ?></div> <!-- .entry-content -->