How do I compare two DateTime objects in PHP 5.2.8?

Question

Having a look on the PHP documentation, the following two methods of the DateTime object would both seem to solve my problem:

• DateTime::diff : Get

Answer 1

$elapsed = '2592000';
// Time in the past
$time_past = '2014-07-16 11:35:33';
$time_past = strtotime($time_past);

// Add a month to that time
$time_past = $time_past + $elapsed;

// Time NOW
$time_now = time();

// Check if its been a month since time past
if($time_past > $time_now){
    echo 'Hasnt been a month';    
}else{
    echo 'Been longer than a month';
}