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<?php
declare(strict_types=1);
namespace Application\Api\Scalar;
use Cake\Chronos\Chronos;
use GraphQL\Error\Error;
use GraphQL\Language\AST\Node;
use GraphQL\Language\AST\StringValueNode;
use GraphQL\Type\Definition\ScalarType;
use GraphQL\Utils\Utils;
class ChronosType extends ScalarType
{
/**
* @var string
*/
public $description = 'A date with time and timezone.';
* Serializes an internal value to include in a response.
*
* @param mixed $value
* @return mixed
public function serialize($value)
if ($value instanceof Chronos) {
return $value->format('c');
}
return $value;
* Parses an externally provided value (query variable) to use as an input
public function parseValue($value)
if (!is_string($value)) { // quite naive, but after all this is example
throw new \UnexpectedValueException('Cannot represent value as Chronos date: ' . Utils::printSafe($value));
if ($value === '') {
return null;
$date = new Chronos($value);
$date = $date->setTimezone(new \DateTimeZone(date_default_timezone_get()));
return $date;
* Parses an externally provided literal value to use as an input (e.g. in Query AST)
* @param $ast Node
* @return null|string
public function parseLiteral($ast, array $variables = null)
// Note: throwing GraphQL\Error\Error vs \UnexpectedValueException to benefit from GraphQL
// error location in query:
if (!($ast instanceof StringValueNode)) {
throw new Error('Query error: Can only parse strings got: ' . $ast->kind, [$ast]);
return $ast->value;
Ecodev /
my-ichtus
