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@ 2016-07-25T10:39:12Z

<?php

date_default_timezone_set('Europe/Prague');

$tz = new \DateTimeZone('UTC');
$date = new \DateTime('2016-05-05 midnight', $tz);

echo $date->format('c');
echo PHP_EOL;
$date->modify('first day of this month midnight');
$date->modify('-2 months');
echo $date->format('c');

Output
Performance
VLD
References
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date_default_timezone_set: documentation ( source)

preferences:dark modelive preview

29.72 ms | 402 KiB | 5 Q