Convert \DateTimeImmutable to \DateTime

Question

How can I convert a DateTimeImmutable object into a DateTime object?

Answer 1

There is a pull request for a DateTime::createFromImmutable() method in PHP. It had been integrated (1, 2), just to be removed later for no reason. Now it seems to be back in, but only for PHP 7.3 and higher.

So this is probably the easiest way right now:

$dateTime = new \DateTime();
$dateTime->setTimestamp($dateTimeImmutable->getTimestamp());

If you need to include timezone information:

$dateTime = new \DateTime(null, $dateTimeImmutable->getTimezone());
$dateTime->setTimestamp($dateTimeImmutable->getTimestamp());

Answer 2

To convert with proper timezone:

For PHP >= 7.3

DateTime::createFromImmutable(dateTimeImmutable);

For PHP <= 7.2

DateTime::createFromFormat(
   DateTimeInterface::ATOM, 
   $dateTimeImmutable->format(DateTimeInterface::ATOM)
);

Answer 3

You can do this as a one-liner:

$dateTime = new DateTime("@{$dateTimeImmutable->getTimeStamp()}");