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<?php $a = new DateTime('2020-01-01 23:59:40'); $b = new DateTimeImmutable('2020-01-01 23:59:40'); var_dump($a, $b); $a->add(new DateInterval('P1D')); $c = $b->add(new DateInterval('P1D')); var_dump($a, $b, $c);
Output for git.master, git.master_jit, rfc.property-hooks
object(DateTime)#1 (3) { ["date"]=> string(26) "2020-01-01 23:59:40.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } object(DateTimeImmutable)#2 (3) { ["date"]=> string(26) "2020-01-01 23:59:40.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } object(DateTime)#1 (3) { ["date"]=> string(26) "2020-01-02 23:59:40.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } object(DateTimeImmutable)#2 (3) { ["date"]=> string(26) "2020-01-01 23:59:40.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } object(DateTimeImmutable)#4 (3) { ["date"]=> string(26) "2020-01-02 23:59:40.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }

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