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@ 2015-04-09T07:59:51Z

<?php

if (class_exists('DateTimeImmutable')) {
    $d = new DateTimeImmutable('2012-02-01 00:00:00.123456');
    $d = $d->setTimeZone(new DateTimeZone('UTC'));
    echo $d->format('u');
}

Output
Performance
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References
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class_exists: documentation ( source)

preferences:dark modelive preview

39.42 ms | 402 KiB | 5 Q