Parse Twitter created_at value into friendly time format; relative time; time ago

Here's the PHP version: function ago($a) {              $b = strtotime("now");     $c = strtotime($a);     $d = $b - $c;     $minute = 60;     $hour = $minute * 60;     $day = $hour * 24;     $week = $day * 7;              if(is_numeric($d) && $d > 0) {                  if($d < 3) return "right now";         if($d < $minute) return floor($d) . " seconds ago";         if($d < $minute * 2) return "about 1 minute ago";         if($d < $hour) return floor($d / $minute) . " minutes ago";         if($d < $hour * 2) return "about 1 hour ago";         if($d < $day) return floor($d / $hour) . " hours ago";         if($d > $day && $d < $day * 2) return "yesterday";         if($d < $day * 365) return floor($d / $day) . " days ago";                  return "over a year ago";     } }