Online PHP editor | refs for TCEIF

<?php $date = new DateTimeImmutable('@'.'1572764400'); var_dump($date->getTimestamp()); var_dump($date->setTimezone(new DateTimeZone('America/Chicago'))->getTimestamp()); var_dump($date->setTimezone(new DateTimeZone('America/Chicago'))->modify('+3599 seconds')->getTimestamp()); var_dump($date->setTimezone(new DateTimeZone('America/Chicago'))->modify('+3600 seconds')->getTimestamp()); var_dump($date->setTimezone(new DateTimeZone('America/Chicago'))->modify('+3601 seconds')->getTimestamp());