code

<?php
date_default_timezone_set("Europe/Helsinki");
$DateToday = new DateTime(date("Y/m/d"));
$DateOpen = new DateTime('2014/10/01');
$DateToday->format('d');
$DateOpen->format('d');
$diff = date_diff($DateOpen, $DateToday);
$diff->format('d');

?>
	<div class="flip-container pos_1 <?php if($diff >= '01') { ?>
    <div class="flipper"><div class="front_1"></div>
	<div class="back_1"><img src="img/1.png"></div></div><?php }else{ ?>
        	<div class="front_1">
            </div>
            <div class="back_1">
            </div>
      	<?php }?>
    </div>