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<?php var_dump((new DateTime('@123'))->format('U') === '123'); var_dump((new DateTimeImmutable('@123'))->format('U') === '123'); var_dump((new DateTime('@123.456789'))->format('U.u') === '123.456789'); var_dump((new DateTimeImmutable('@123.456789'))->format('U.u') === '123.456789');