How to Display a Disclaimer on Old WordPress Posts

It can be a good idea to display a warning to your visitors stating that they are currently reading an old post which might not be up to date. This code snippet will display warning on posts that are older then one year (365 days).

Paste the following code in your single.php file, within the loop. Edited the text on line 7 as desired.

$ageunix = get_the_time('U');
$days_old_in_seconds = ((time() - $ageunix));
$days_old = (($days_old_in_seconds/86400));

if ($days_old > 365) {
  echo '<div class="disclaimer">DISCLAIMER: this post is older than one year and may not be up to date with latest WordPress version.<br /></div>';