When you’re blogging, 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. Here’s an out-of-the-box solution to do it.

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.</div>'; 


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