Comparing dates is a common action when programming. But you could have side effects mixing UTC and timezones... This snippet shows you how to do it the correct way.

use Drupal\Core\Datetime\DrupalDateTime; // on top of file
use Drupal\datetime\Plugin\Field\FieldType\DateTimeItemInterface; // on top of file

$end_date = $project->get('field_project_end_date')->date->getTimestamp();
$now = new DrupalDateTime('now');
$now->setTimezone(new \DateTimeZone(DateTimeItemInterface::STORAGE_TIMEZONE));
$now = $now->getTimestamp();
if($end_date < $now) {
    // Rest of my script




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