Doctrine DBAL Timestamp type for use with Laravel

Timestamp.php

<?php

namespace Database\Migrations\Types;

use DateTime;
use Doctrine\DBAL\Platforms\AbstractPlatform;
use Doctrine\DBAL\Types\ConversionException;
use Doctrine\DBAL\Types\PhpDateTimeMappingType;
use Doctrine\DBAL\Types\Type;

/**
 * Timestamp type for the Doctrine 3 ORM
 */
class Timestamp extends Type implements PhpDateTimeMappingType
{
    /**
     * Type name
     *
     * @var string
     */
    const TIMESTAMP = 'timestamp';

    /**
     * @inheritDoc
     */
    public function getName()
    {
        return self::TIMESTAMP;
    }

    /**
     * @inheritDoc
     */
    public function getSQLDeclaration(array $fieldDeclaration, AbstractPlatform $platform)
    {
        $declaration = strtoupper(self::TIMESTAMP);

        if (isset($fieldDeclaration['notnull']) && $fieldDeclaration['notnull'] == true) {
            return $declaration;
        }

        return $declaration . ' NULL';
    }

    /**
     * @inheritDoc
     */
    public function convertToDatabaseValue($value, AbstractPlatform $platform)
    {
        if (null === $value) {
            return null;
        }

        if ($value instanceof DateTime) {
            return $value->getTimestamp();
        }

        throw ConversionException::conversionFailedInvalidType(
            $value,
            $this->getName(),
            ['null', 'DateTime']
        );
    }

    /**
     * @inheritDoc
     */
    public function convertToPHPValue($value, AbstractPlatform $platform)
    {
        if (null === $value) {
            return null;
        }

        $st = new DateTime();
        $st->setTimestamp($value);

        return $st;
    }
}

To implement, add the following to the up()/down() methods of the migrations where it is needed, or in a service provider:

use Doctrine\DBAL\Types\Type;

if (! Type::hasType('timestamp')) {
    Type::addType('timestamp', Timestamp::class);
}