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<?php $diff = (new DateTimeImmutable('2021-09-01 UTC'))->diff(new DateTimeImmutable('2021-12-01 UTC')); var_dump($diff); $diff = (new DateTimeImmutable('2021-09-01 Asia/Tokyo'))->diff(new DateTimeImmutable('2021-12-01 Asia/Tokyo')); var_dump($diff);

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