Relative times for posts are off.

Hello. I’m switching over to relative times for my website and am having some trouble. For some reason, articles start at “Posted 4 hours ago” instead of “Posted less than a minute ago,” even if I did post the article just a minute ago.

The function I’m using is below:

if(!function_exists('how_long_ago')){
        function how_long_ago($timestamp){
            $difference = time() - $timestamp;

            if($difference >= 60*60*24*365){        // if more than a year ago
                the_date();
            } elseif($difference >= 60*60*24*7*5){  // if more than five weeks ago
                $int = intval($difference / (60*60*24*30));
                $s = ($int > 1) ? 's' : '';
                $r = $int . ' month' . $s . ' ago';
            } elseif($difference >= 60*60*24*7){        // if more than a week ago
                $int = intval($difference / (60*60*24*7));
                $s = ($int > 1) ? 's' : '';
                $r = $int . ' week' . $s . ' ago';
            } elseif($difference >= 60*60*24){      // if more than a day ago
                $int = intval($difference / (60*60*24));
                $s = ($int > 1) ? 's' : '';
                $r = $int . ' day' . $s . ' ago';
            } elseif($difference >= 60*60){         // if more than an hour ago
                $int = intval($difference / (60*60));
                $s = ($int > 1) ? 's' : '';
                $r = $int . ' hour' . $s . ' ago';
            } elseif($difference >= 60){            // if more than a minute ago
                $int = intval($difference / (60));
                $s = ($int > 1) ? 's' : '';
                $r = $int . ' minute' . $s . ' ago';
            } else {                                // if less than a minute ago
                $r = 'less than a minute ago';
            }

            return $r;
        }
    }

Any ideas? Thanks.