Right, that makes perfect sense. I'm familiar with the code you are referring to, but (to me), it seems to be checking for which date is used as the source. In my case, the creation date is the source. How can the code be modified so that it will also display the modified date, while still using the created date as the source?
<?php if ($this->entryParams->get('post_date', true)) { ?>
<div class="eb-entry-date">
<i class="fa fa-clock-o"></i>
<time class="eb-meta-date" itemprop="datePublished" content="<?php echo $post->getCreationDate($this->entryParams->get('post_date_source', 'created'))->format(JText::_('DATE_FORMAT_LC4'));?>">
<?php echo $post->getDisplayDate($this->entryParams->get('post_date_source', 'created'))->format(JText::_('DATE_FORMAT_LC1')); ?>
<meta itemprop="dateModified" content="<?php echo $post->getModifiedDate()->format(JText::_('DATE_FORMAT_LC4'));?>"/>
<meta itemprop="mainEntityOfPage" content="<?php echo $post->getPermalink(true, true);?>"/>
</time>
</div>
<?php } ?>