= 5.1 by Zach Leatherman (zachleat.com)
// Slight modification denoted below to handle months and years.
class prettydate
{
public static function getStringResolved($date, $compareTo = NULL)
{
if(!is_null($compareTo)) {
$compareTo = new DateTime($compareTo);
}
return self::getString(new DateTime($date), $compareTo);
}

public static function getString(DateTime $date, DateTime $compareTo = NULL)
{
if(is_null($compareTo)) {
$compareTo = new DateTime('now');
}
$diff = $compareTo->format('U') - $date->format('U');
$dayDiff = floor($diff / 86400);

if(is_nan($dayDiff)) return '';

$end = 'ago';
if($dayDiff < 0) { # date is in the future
$end = 'left';
$dayDiff *= -1;
}

if($dayDiff == 0) {
if($diff < 60) {
return 'Just now';
} elseif($diff < 120) {
return '1 minute '.$end;
} elseif($diff < 3600) {
return floor($diff/60) . ' minutes '.$end;
} elseif($diff < 7200) {
return '1 hour '.$end;
} elseif($diff < 86400) {
return floor($diff/3600) . ' hours '.$end;
}
} elseif($dayDiff == 1) {
return 'Yesterday';
} elseif($dayDiff < 7) {
return $dayDiff . ' days '.$end;
} elseif($dayDiff == 7) {
return '1 week '.$end;
} elseif($dayDiff < (7*6)) { // Modifications Start Here
// 6 weeks at most
return ceil($dayDiff/7) . ' weeks '.$end;
} elseif($dayDiff < 365) {
return ceil($dayDiff/(365/12)) . ' months '.$end;
} else {
$years = round($dayDiff/365);
return $years . ' year' . ($years != 1 ? 's' : '') . ' '.$end;
}
}
}