Online PHP editor | output for oh8mK

<?php $date = new \DateTime(); $date->setTimestamp(1236443400)->setTimeZone(new \DateTimeZone('America/Chicago')); print ($date->format('c') === '2009-03-07T10:30:00-06:00') . PHP_EOL; $date = new \DateTime(); $date->setTimestamp(1244388600)->setTimeZone(new \DateTimeZone('America/Chicago')); print ($date->format('c') === '2009-06-07T10:30:00-05:00') . PHP_EOL; $date = new \DateTime(); $date->setTimestamp(-5076977400)->setTimeZone(new \DateTimeZone('UTC')); print ($date->format('c') === '1809-02-12T16:30:00+00:00') . PHP_EOL; $date = new \DateTime(); $date->setTimestamp(11833956240)->setTimeZone(new \DateTimeZone('UTC')); print ($date->format('c') === '2345-01-02T02:04:00+00:00') . PHP_EOL;