symfony
diff --git a/‎src/Symfony/Component/Serializer/CHANGELOG.md
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diff --git a/‎src/Symfony/Component/Serializer/Normalizer/DateTimeZoneNormalizer.php
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diff --git a/‎src/Symfony/Component/Serializer/Tests/Normalizer/DateTimeZoneNormalizerTest.php
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@@ -5,6 +5,7 @@ CHANGELOG
 -----
 
  * added the list of constraint violations' parameters in `ConstraintViolationListNormalizer`
+ * added support for serializing `DateTimeZone` objects
 
 4.2.0
 -----
 
@@ -0,0 +1,79 @@
+<?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\NotNormalizableValueException;
+
+/**
+ * Normalizes a {@see \DateTimeZone} object to a timezone string.
+ *
+ * @author Jérôme Desjardins <jewome62@gmail.com>
+ */
+class DateTimeZoneNormalizer implements NormalizerInterface, DenormalizerInterface, CacheableSupportsMethodInterface
+{
+    /**
+     * {@inheritdoc}
+     *
+     * @throws InvalidArgumentException
+     */
+    public function normalize($object, $format = null, array $context = [])
+    {
+        if (!$object instanceof \DateTimeZone) {
+            throw new InvalidArgumentException('The object must be an instance of "\DateTimeZone".');
+        }
+
+        return $object->getName();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function supportsNormalization($data, $format = null)
+    {
+        return $data instanceof \DateTimeZone;
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @throws NotNormalizableValueException
+     */
+    public function denormalize($data, $class, $format = null, array $context = [])
+    {
+        if ('' === $data || null === $data) {
+            throw new NotNormalizableValueException('The data is either an empty string or null, you should pass a string that can be parsed as a DateTimeZone.');
+        }
+
+        try {
+            return new \DateTimeZone($data);
+        } catch (\Exception $e) {
+            throw new NotNormalizableValueException($e->getMessage(), $e->getCode(), $e);
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function supportsDenormalization($data, $type, $format = null)
+    {
+        return \DateTimeZone::class === $type;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function hasCacheableSupportsMethod(): bool
+    {
+        return __CLASS__ === \get_class($this);
+    }
+}
@@ -0,0 +1,81 @@
+<?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\Tests\Normalizer;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Serializer\Normalizer\DateTimeZoneNormalizer;
+
+/**
+ * @author Jérôme Desjardins <jewome62@gmail.com>
+ */
+class DateTimeZoneNormalizerTest extends TestCase
+{
+    /**
+     * @var DateTimeZoneNormalizer
+     */
+    private $normalizer;
+
+    protected function setUp()
+    {
+        $this->normalizer = new DateTimeZoneNormalizer();
+    }
+
+    public function testSupportsNormalization()
+    {
+        $this->assertTrue($this->normalizer->supportsNormalization(new \DateTimeZone('UTC')));
+        $this->assertFalse($this->normalizer->supportsNormalization(new \DateTimeImmutable()));
+        $this->assertFalse($this->normalizer->supportsNormalization(new \stdClass()));
+    }
+
+    public function testNormalize()
+    {
+        $this->assertEquals('UTC', $this->normalizer->normalize(new \DateTimeZone('UTC')));
+        $this->assertEquals('Asia/Tokyo', $this->normalizer->normalize(new \DateTimeZone('Asia/Tokyo')));
+    }
+
+    /**
+     * @expectedException \Symfony\Component\Serializer\Exception\InvalidArgumentException
+     */
+    public function testNormalizeBadObjectTypeThrowsException()
+    {
+        $this->normalizer->normalize(new \stdClass());
+    }
+
+    public function testSupportsDenormalization()
+    {
+        $this->assertTrue($this->normalizer->supportsDenormalization(null, \DateTimeZone::class));
+        $this->assertFalse($this->normalizer->supportsDenormalization(null, \DateTimeImmutable::class));
+        $this->assertFalse($this->normalizer->supportsDenormalization(null, \stdClass::class));
+    }
+
+    public function testDenormalize()
+    {
+        $this->assertEquals(new \DateTimeZone('UTC'), $this->normalizer->denormalize('UTC', \DateTimeZone::class, null));
+        $this->assertEquals(new \DateTimeZone('Asia/Tokyo'), $this->normalizer->denormalize('Asia/Tokyo', \DateTimeZone::class, null));
+    }
+
+    /**
+     * @expectedException \Symfony\Component\Serializer\Exception\NotNormalizableValueException
+     */
+    public function testDenormalizeNullTimeZoneThrowsException()
+    {
+        $this->normalizer->denormalize(null, \DateTimeZone::class, null);
+    }
+
+    /**
+     * @expectedException \Symfony\Component\Serializer\Exception\NotNormalizableValueException
+     */
+    public function testDenormalizeBadTimeZoneThrowsException()
+    {
+        $this->normalizer->denormalize('Jupiter/Europa', \DateTimeZone::class, null);
+    }
+}