diff --git a/src/Symfony/Component/Serializer/Normalizer/DateTimeNormalizer.php b/src/Symfony/Component/Serializer/Normalizer/DateTimeNormalizer.php
index aa7988d37ed55..3a926d0ae6c5f 100644
--- a/src/Symfony/Component/Serializer/Normalizer/DateTimeNormalizer.php
+++ b/src/Symfony/Component/Serializer/Normalizer/DateTimeNormalizer.php
@@ -80,9 +80,6 @@ public function normalize(mixed $object, string $format = null, array $context =
         return $object->format($dateTimeFormat);
     }
 
-    /**
-     * @param array $context
-     */
     public function supportsNormalization(mixed $data, string $format = null /* , array $context = [] */): bool
     {
         return $data instanceof \DateTimeInterface;
@@ -96,7 +93,7 @@ public function denormalize(mixed $data, string $type, string $format = null, ar
         $dateTimeFormat = $context[self::FORMAT_KEY] ?? null;
         $timezone = $this->getTimezone($context);
 
-        if (null === $data || !\is_string($data) || '' === trim($data)) {
+        if (null === $data || (!\is_string($data) && !(\is_int($data) && 'U' === $dateTimeFormat)) || '' === trim($data)) {
             throw NotNormalizableValueException::createForUnexpectedDataType('The data is either not an string, an empty string, or null; you should pass a string that can be parsed with the passed format or a valid DateTime string.', $data, [Type::BUILTIN_TYPE_STRING], $context['deserialization_path'] ?? null, true);
         }
 
@@ -131,9 +128,6 @@ public function denormalize(mixed $data, string $type, string $format = null, ar
         }
     }
 
-    /**
-     * @param array $context
-     */
     public function supportsDenormalization(mixed $data, string $type, string $format = null /* , array $context = [] */): bool
     {
         return isset(self::SUPPORTED_TYPES[$type]);
diff --git a/src/Symfony/Component/Serializer/Tests/Normalizer/DateTimeNormalizerTest.php b/src/Symfony/Component/Serializer/Tests/Normalizer/DateTimeNormalizerTest.php
index 674dfaab5382d..fcd4694dd3988 100644
--- a/src/Symfony/Component/Serializer/Tests/Normalizer/DateTimeNormalizerTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Normalizer/DateTimeNormalizerTest.php
@@ -305,4 +305,11 @@ public function testDenormalizeFormatMismatchThrowsException()
         $this->expectException(UnexpectedValueException::class);
         $this->normalizer->denormalize('2016-01-01T00:00:00+00:00', \DateTimeInterface::class, null, [DateTimeNormalizer::FORMAT_KEY => 'Y-m-d|']);
     }
+
+    public function testDenormalizeDateTimeIntegerWithTimestampFormat()
+    {
+        $timestamp = time();
+        $denormalizedDate = $this->normalizer->denormalize($timestamp, \DateTimeImmutable::class, null, [DateTimeNormalizer::FORMAT_KEY => 'U']);
+        $this->assertSame($timestamp, $denormalizedDate->getTimestamp());
+    }
 }