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run code in 300+ PHP versions simultaneously
<?php $d1 = new DateTime('2015-06-30 23:59:59'); $d2 = new DateTime('2015-06-30 23:59:60'); echo $d1->format('U'); echo PHP_EOL; echo $d1->format('Y-m-d H:i:s'); echo PHP_EOL; echo $d2->format('U'); echo PHP_EOL; echo $d2->format('Y-m-d H:i:s'); echo PHP_EOL; echo date('r', 1435701600);

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