How can the developer of the script explain the rel="1428482400" attribute?

The rel="1428482400" attribute likely represents a Unix timestamp that needs to be converted into a human-readable date format. To explain this to the developer, you can mention that Unix timestamps are a way to represent dates as a single number, and they can be converted using PHP's date() function. The developer should use the date() function to convert the Unix timestamp into a readable date format.

<?php
// Assuming $timestamp contains the Unix timestamp value
$timestamp = 1428482400;

// Convert Unix timestamp to a human-readable date format
$date = date('Y-m-d H:i:s', $timestamp);

echo $date;
?>