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@ 2014-07-04T00:31:37Z

<?php

date_default_timezone_set('Europe/Prague');
$originalDate = new DateTimeImmutable('2011-11-11');
$modifiedDate = $originalDate->modify('+1 year');
assert($originalDate !== $modifiedDate);
assert($modifiedDate->format('Y-m-d') === '2012-11-11');
assert($originalDate->format('Y-m-d') === '2011-11-11');

Output
Performance
VLD
References
Branches

assert: documentation ( source)
date_default_timezone_set: documentation ( source)

preferences:dark modelive preview

38.41 ms | 402 KiB | 5 Q