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diff --git a/vendor/symfony/serializer/Normalizer/DateIntervalNormalizer.php b/vendor/symfony/serializer/Normalizer/DateIntervalNormalizer.php
new file mode 100644
index 000000000..f3c663c6b
--- /dev/null
+++ b/vendor/symfony/serializer/Normalizer/DateIntervalNormalizer.php
@@ -0,0 +1,103 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Normalizer;
+
+use Symfony\Component\Serializer\Exception\InvalidArgumentException;
+use Symfony\Component\Serializer\Exception\UnexpectedValueException;
+
+/**
+ * Normalizes an instance of {@see \DateInterval} to an interval string.
+ * Denormalizes an interval string to an instance of {@see \DateInterval}.
+ *
+ * @author Jérôme Parmentier <jerome@prmntr.me>
+ */
+class DateIntervalNormalizer implements NormalizerInterface, DenormalizerInterface
+{
+    const FORMAT_KEY = 'dateinterval_format';
+
+    private $format;
+
+    /**
+     * @param string $format
+     */
+    public function __construct($format = 'P%yY%mM%dDT%hH%iM%sS')
+    {
+        $this->format = $format;
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @throws InvalidArgumentException
+     */
+    public function normalize($object, $format = null, array $context = array())
+    {
+        if (!$object instanceof \DateInterval) {
+            throw new InvalidArgumentException('The object must be an instance of "\DateInterval".');
+        }
+
+        $dateIntervalFormat = isset($context[self::FORMAT_KEY]) ? $context[self::FORMAT_KEY] : $this->format;
+
+        return $object->format($dateIntervalFormat);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function supportsNormalization($data, $format = null)
+    {
+        return $data instanceof \DateInterval;
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @throws InvalidArgumentException
+     * @throws UnexpectedValueException
+     */
+    public function denormalize($data, $class, $format = null, array $context = array())
+    {
+        if (!is_string($data)) {
+            throw new InvalidArgumentException(sprintf('Data expected to be a string, %s given.', gettype($data)));
+        }
+
+        if (!$this->isISO8601($data)) {
+            throw new UnexpectedValueException('Expected a valid ISO 8601 interval string.');
+        }
+
+        $dateIntervalFormat = isset($context[self::FORMAT_KEY]) ? $context[self::FORMAT_KEY] : $this->format;
+
+        $valuePattern = '/^'.preg_replace('/%([yYmMdDhHiIsSwW])(\w)/', '(?P<$1>\d+)$2', $dateIntervalFormat).'$/';
+        if (!preg_match($valuePattern, $data)) {
+            throw new UnexpectedValueException(sprintf('Value "%s" contains intervals not accepted by format "%s".', $data, $dateIntervalFormat));
+        }
+
+        try {
+            return new \DateInterval($data);
+        } catch (\Exception $e) {
+            throw new UnexpectedValueException($e->getMessage(), $e->getCode(), $e);
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function supportsDenormalization($data, $type, $format = null)
+    {
+        return \DateInterval::class === $type;
+    }
+
+    private function isISO8601($string)
+    {
+        return preg_match('/^P(?=\w*(?:\d|%\w))(?:\d+Y|%[yY]Y)?(?:\d+M|%[mM]M)?(?:(?:\d+D|%[dD]D)|(?:\d+W|%[wW]W))?(?:T(?:\d+H|[hH]H)?(?:\d+M|[iI]M)?(?:\d+S|[sS]S)?)?$/', $string);
+    }
+}