Wordpress showing just the timestamp of first article - php

Question

my wordpress theme i created shows just the first timestamp of the first article of multiple article on the page. On the rest of them there is just a empty space, so php generated no echo.
I think that there is something wrong with the loop, but i found similar loops on the wp page. Can someone help me ?
here is my code
<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
<div class="entry">
<h2 class="title"><?php the_title(); ?></h2>
<div class="time-text">added on: <?php the_date('d.m.Y'); ?> - Author: <?php the_author(); ?></div>
<div id="text_post" style="margin-top:20px;">
<?php the_content(); ?>
</div></div>
<?php endwhile;endif?>

Answer 1

It's how the the_date function works. Quoting the "special note" on that page:
SPECIAL NOTE: When there are multiple posts on a page published under
the SAME DAY, the_date() only displays the date for the first post
(that is, the first instance of the_date()). To repeat the date for
posts published under the same day, you should use the Template Tag
the_time() or get_the_date() (since 3.0) with a date-specific format
string.
Try using <?php echo get_the_date('d.m.Y'); ?> instead of <?php the_date('d.m.Y'); ?>. That's untested - I'm just going by that quote.

Answer 2

First you need to open these three files:
index.php
single.php
page.php
Then you will need to locate the following code:
<?php the_modified_time('F jS, Y');?>
Note: Since there are so many formats of displaying dates, you might not see the exact code, but something along this line.
Replace it with:
<?php $u_time = get_the_time('U');
$u_modified_time = get_the_modified_time('U');
if ($u_modified_time >= $u_time + 86400) {
echo "and last modified on ";
the_modified_time('F jS, Y');
echo " at ";
the_modified_time();
echo ", "; } ?>