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@ 2014-02-09T20:07:55Z

<?php
$time = new DateTime();
$time2 = new DateTime('-2hours');
echo $time2->format('c').PHP_EOL;
$sub = new DateInterval('PT1H');
var_dump($sub);

Output
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var_dump: documentation ( source)

preferences:dark modelive preview

53.42 ms | 402 KiB | 5 Q