ChangeTimezone.php

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<?php

declare(strict_types=1);

namespace ILIAS\Refinery\DateTime;

use ILIAS\Refinery\DeriveApplyToFromTransform;
use ILIAS\Refinery\Transformation;
use ILIAS\Refinery\DeriveInvokeFromTransform;
use DateTimeZone;
use InvalidArgumentException;
use DateTimeImmutable;

class ChangeTimezone implements Transformation
{
    use DeriveApplyToFromTransform;
    use DeriveInvokeFromTransform;

    private DateTimeZone $timezone;

    public function __construct(string $timezone)
    {
        if (!in_array($timezone, timezone_identifiers_list(), true)) {
            throw new InvalidArgumentException("$timezone is not a valid timezone identifier", 1);
        }
        $this->timezone = new DateTimeZone($timezone);
    }

    public function transform($from): DateTimeImmutable
    {
        if (!$from instanceof DateTimeImmutable) {
            throw new InvalidArgumentException("$from is not a DateTimeImmutable-object", 1);
        }

        $ts = $from->format('Y-m-d H:i:s');

        return new DateTimeImmutable($ts, $this->timezone);
    }
}