Hi @alexnl88
Hmm… May be you could have an array that records the date field’s values then use in_array() PHP function to check if the array contains some the date value if not, then add it. The code would look something like this:
<?php
$dates = array();
if (have_posts()) : while(have_posts()) : the_post();
$acf_date = the_field('event_date');
if ( !in_array($acf_date, $dates) ){ ?>
<div><?php echo $acf_date; array_push($dates, $acf_date); ?><?div>
<?php } endwhile; endif; ?>
For more information, check out the following links:
http://www.w3schools.com/php/func_array_push.asp
http://php.net/manual/en/function.in-array.php
