--- /dev/null
+<?php
+
+namespace Drupal\hal\Normalizer;
+
+use Drupal\Core\Field\FieldItemInterface;
+use Drupal\Core\Field\Plugin\Field\FieldType\TimestampItem;
+use Drupal\serialization\Normalizer\TimeStampItemNormalizerTrait;
+
+/**
+ * Converts values for TimestampItem to and from common formats for hal.
+ */
+class TimestampItemNormalizer extends FieldItemNormalizer {
+
+ use TimeStampItemNormalizerTrait;
+
+ /**
+ * The interface or class that this Normalizer supports.
+ *
+ * @var string
+ */
+ protected $supportedInterfaceOrClass = TimestampItem::class;
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function normalizedFieldValues(FieldItemInterface $field_item, $format, array $context) {
+ $normalized = parent::normalizedFieldValues($field_item, $format, $context);
+ return $this->processNormalizedValues($normalized);
+ }
+
+}