Relative date by @Pellegrom

gistfile1.php

<?php
function relative_time($date, $postfix = ' ago', $fallback = 'F Y') 
{
    $diff = time() - strtotime($date);
    if($diff < 60) 
        return $diff . ' second'. ($diff != 1 ? 's' : '') . $postfix;
    $diff = round($diff/60);
    if($diff < 60) 
        return $diff . ' minute'. ($diff != 1 ? 's' : '') . $postfix;
    $diff = round($diff/60);
    if($diff < 24) 
        return $diff . ' hour'. ($diff != 1 ? 's' : '') . $postfix;
    $diff = round($diff/24);
    if($diff < 7) 
        return $diff . ' day'. ($diff != 1 ? 's' : '') . $postfix;
    $diff = round($diff/7);
    if($diff < 4) 
        return $diff . ' week'. ($diff != 1 ? 's' : '') . $postfix;
    $diff = round($diff/4);
    if($diff < 12) 
        return $diff . ' month'. ($diff != 1 ? 's' : '') . $postfix;

    return date($fallback, strtotime($date));
}