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@ 2013-08-20T13:20:07Z

<?php
$date = new \DateTime();
$oneWeek = new \DateInterval('P7D');

var_dump($date->format('W'));

$date->add($oneWeek);

var_dump($date->format('W'));

Output
Performance
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var_dump: documentation ( source)

preferences:dark modelive preview

32.99 ms | 402 KiB | 5 Q