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<?php $dt = new DateTime('2015-01-01 00:00:00+00:00'); var_dump($dt->format('c')); var_dump($dt->modify('+1 s')->format('c')); $dt = new DateTimeImmutable('2015-01-01 00:00:00+00:00'); var_dump($dt->format('c')); var_dump($dt->modify('+1 s')->format('c'));
Output for git.master, git.master_jit
string(25) "2015-01-01T00:00:00+00:00" string(25) "2015-01-01T00:00:00+01:00" string(25) "2015-01-01T00:00:00+00:00" string(25) "2015-01-01T00:00:00+01:00"
Output for rfc.property-hooks
string(25) "2015-01-01T00:00:00+00:00" string(25) "2015-01-01T00:00:00+00:00" string(25) "2015-01-01T00:00:00+00:00" string(25) "2015-01-01T00:00:00+00:00"

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