Conditional Tag Based on Age of Post [duplicate]

Question

Possible Duplicate:
Add inline HTML to posts published within last 24hrs

I've been searching through the codex and Google and cannot not find a conditional tag based on age of post.

I'm looking to display a graphic overlay on top of a featured image if the post is less than three days old, for example.

Thanks very much.

Answer 1

<?php
$today = date('r');
$articledate = get_the_time('r');
$difference = round((strtotime($today) - strtotime($articledate))/(24*60*60),0);
if ($difference >= 3) { ?>
this is a three day old post
<?php } ?>

the 3 in if ($difference >= 3) { ?> is 3 days old, you can change that to whatever you want. How I could do it, is add a css class to include the image.