Online PHP editor | output for 4fncr

<?php echo date_default_timezone_get(); // prints Europe/Amsterdam echo "\n\n"; $dateTime = new DateTime('2016-10-29 10:00:00'); echo $dateTime->format(DateTime::RFC3339); echo "\n"; $dateTime->add(new DateInterval('PT23H')); echo $dateTime->format(DateTime::RFC3339); // prints 2016-10-30T08:00:00+01:00 echo "\n\n"; $dateTime = new DateTime('2016-10-29 10:00:00'); echo $dateTime->format(DateTime::RFC3339); echo "\n"; $dateTime->modify('+ 23 hours'); echo $dateTime->format(DateTime::RFC3339); // prints 2016-10-30T09:00:00+01:00 echo "\n\n";