DateTimeTransformation.php

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<?php

declare(strict_types=1);

namespace ILIAS\Refinery\KindlyTo\Transformation;

use ILIAS\Refinery\ConstraintViolationException;
use ILIAS\Refinery\DeriveApplyToFromTransform;
use ILIAS\Refinery\DeriveInvokeFromTransform;
use ILIAS\Refinery\Transformation;
use DateTimeImmutable;
use DateTimeInterface;

class DateTimeTransformation implements Transformation
{
    use DeriveApplyToFromTransform;
    use DeriveInvokeFromTransform;

    public function transform($from): DateTimeImmutable
    {
        if ($from instanceof DateTimeImmutable) {
            return $from;
        }

        $formats = [
            DateTimeInterface::ATOM,
            DateTimeInterface::COOKIE,
            DateTimeInterface::ISO8601,
            DateTimeInterface::RFC822,
            DateTimeInterface::RFC7231,
            DateTimeInterface::RFC3339_EXTENDED
        ];

        if (is_string($from)) {
            foreach ($formats as $format) {
                $res = DateTimeImmutable::createFromFormat($format, $from);
                if ($res instanceof DateTimeImmutable) {
                    return $res;
                }
            }
        }

        if (is_int($from) || is_float($from)) {
            return new DateTimeImmutable("@" . round($from));
        }

        throw new ConstraintViolationException(
            sprintf('Value "%s" could not be transformed.', var_export($from, true)),
            'no_valid_datetime',
            $from
        );
    }
}