Getting a DateTime object from a DateTimeImmuntable object with PHP

Published on 2023-01-03 • Modified on 2023-01-03

This snippet shows how to get a DateTime object from a DateTimeImmuntable object with PHP. We can use the setTimestamp() function or the createFromImmutable static function, which is more elegant, IMHO.

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<?php

declare(strict_types=1);

namespace App\Controller\Snippet;

/**
 * I am using a PHP trait to isolate each snippet in a file.
 * This code should be called from a Symfony controller extending AbstractController (as of Symfony 4.2)
 * or Symfony\Bundle\FrameworkBundle\Controller\Controller (Symfony <= 4.1).
 * Services are injected in the main controller constructor.
 */
trait Snippet239Trait
{
    public function snippet239(): void
    {
        $date = '2023-01-03';

        // 1. with setTimeStamp
        $immutable = new \DateTimeImmutable($date);
        $mutable = (new \DateTime())->setTimestamp($immutable->getTimestamp());
        echo $mutable->format(\DateTimeInterface::ATOM).PHP_EOL;

        // 2. using createFromImmutable
        $mutable = \DateTime::createFromImmutable($immutable);
        echo $mutable->format(\DateTimeInterface::ATOM).PHP_EOL;

        // That's it! 😁
    }
}

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