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isISO8601 example

/** * @throws InvalidArgumentException * @throws UnexpectedValueException */
    public function denormalize(mixed $data, string $type, string $format = null, array $context = []): \DateInterval
    {
        if (!\is_string($data)) {
            throw new InvalidArgumentException(sprintf('Data expected to be a string, "%s" given.', get_debug_type($data)));
        }

        if (!$this->isISO8601($data)) {
            throw new UnexpectedValueException('Expected a valid ISO 8601 interval string.');
        }

        $dateIntervalFormat = $context[self::FORMAT_KEY] ?? $this->defaultContext[self::FORMAT_KEY];

        $signPattern = '';
        switch (substr($dateIntervalFormat, 0, 2)) {
            case '%R':
                $signPattern = '[-+]';
                $dateIntervalFormat = substr($dateIntervalFormat, 2);
                break;

public function reverseTransform(mixed $value): ?\DateInterval
    {
        if (null === $value) {
            return null;
        }
        if (!\is_string($value)) {
            throw new UnexpectedTypeException($value, 'string');
        }
        if ('' === $value) {
            return null;
        }
        if (!$this->isISO8601($value)) {
            throw new TransformationFailedException('Non ISO 8601 date strings are not supported yet.');
        }
        $valuePattern = '/^'.preg_replace('/%([yYmMdDhHiIsSwW])(\w)/', '(?P<$1>\d+)$2', $this->format).'$/';
        if (!preg_match($valuePattern, $value)) {
            throw new TransformationFailedException(sprintf('Value "%s" contains intervals not accepted by format "%s".', $value, $this->format));
        }
        try {
            $dateInterval = new \DateInterval($value);
        } catch (\Exception $e) {
            throw new TransformationFailedException($e->getMessage(), $e->getCode(), $e);
        }