Google Webmaster Tools – author & updated missing

Hi there,

I recently checked the Structured Data section of the Google Webmaster Tools. It says that all my posts have missing “author” and “updated” markups.

Based on various posts I found on the Internet, I have tried to adjust the content-single.php with the following code:

old (updated):
<?php athemes_posted_on(); ?>

new (updated):
<span class=”date updated”><?php the_time();></span>

And also added the following code for the missing author markup:

<span class=”vcard author”>
<span class=”fn”><?php the_author(); ?></span>
</span>

However, the error message at Webmaster Tools still occurs.

Does anyone have a solution to this problem? That would be great! Thank you!

Cheers,
Christian