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@ 2013-09-03T08:10:32Z

<?php
$date = new DateTime("1899-12-31");
// "-2209078800"
var_dump($date->format("U"));
// false
var_dump($date->getTimestamp());

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var_dump: documentation ( source)

preferences:dark modelive preview

35.36 ms | 402 KiB | 5 Q