diff --git a/Attributes/JsonItem.php b/Attributes/JsonItem.php
index 0e5b5bb..1d980cf 100644
--- a/Attributes/JsonItem.php
+++ b/Attributes/JsonItem.php
@@ -34,13 +34,15 @@ class JsonItem
      * @param string $dateFormat - Only used if the actual property type is a Date. This will specify the format it should be converted to in the json string.
      * @param bool $included - If included is false, JSON strings from the decorated object will not include this property.
      * @param bool $omitEmpty - If omitEmpty is true, JSON strings from the decorated object will skip this property if an empty string or null are detected.
+     * @param string|null $timezoneId
      */
     public function __construct(
         public ?string $name = null,
         public ?string $arrayOrCollectionType = null,
         public string $dateFormat = Date::ATOM,
         public bool $included = true,
-        public bool $omitEmpty = false
+        public bool $omitEmpty = false,
+        public ?string $timezoneId = null
     ) {
     }
 }
diff --git a/FeastTests/JsonTest.php b/FeastTests/JsonTest.php
index 98df9c7..d6f97b6 100644
--- a/FeastTests/JsonTest.php
+++ b/FeastTests/JsonTest.php
@@ -116,10 +116,10 @@ public function testMarshal(): void
         $item->fourthTimestamp = DateTime::createFromFormat('U', '1617619260');
         $item->thirdTimestamp->setTimezone(new DateTimeZone('America/New_York'));
         $item->fourthTimestamp->setTimezone(new DateTimeZone('America/New_York'));
-
+        $item->timezoneId = 'America/New_York';
         $data = Json::marshal($item);
         $this->assertEquals(
-            '{"first_name":"FEAST","last_name":"Framework","test_item":{"first_name":"Jeremy","last_name":"Presutti","calls":4,"moreCalls":5},"second_item":{"also_first_name":"Orlando","also_last_name":"Florida"},"items":[{"first_name":"PHP","last_name":"7.4","calls":null,"stringCalls":"test"},{"first_name":"PHP","last_name":"8.0","calls":null,"moreCalls":3,"stringCalls":"other test"}],"cards":["4",5,["6"]],"otherItems":{"first":{"first_name":"Json","last_name":"Serializer","calls":null},"second":{"first_name":"Item","last_name":"Parsing","calls":null}},"thirdItems":{"test":"theTest","test2":"theTest2"},"otherSet":[{"first_name":"Json","last_name":"Serializer","calls":null},{"first_name":"Item","last_name":"Parsing","calls":null}],"thirdSet":["theTest","theTest2"],"calls":null,"count":4,"aClass":{"test":"ItWorks"},"timestamp":"20210415","otherTimestamp":"2021-04-05T06:41:00-04:00","thirdTimestamp":"2021-04-15T20:56:24-04:00","fourthTimestamp":"20210405"}',
+            '{"first_name":"FEAST","last_name":"Framework","test_item":{"first_name":"Jeremy","last_name":"Presutti","calls":4,"moreCalls":5},"second_item":{"also_first_name":"Orlando","also_last_name":"Florida"},"items":[{"first_name":"PHP","last_name":"7.4","calls":null,"stringCalls":"test"},{"first_name":"PHP","last_name":"8.0","calls":null,"moreCalls":3,"stringCalls":"other test"}],"cards":["4",5,["6"]],"otherItems":{"first":{"first_name":"Json","last_name":"Serializer","calls":null},"second":{"first_name":"Item","last_name":"Parsing","calls":null}},"thirdItems":{"test":"theTest","test2":"theTest2"},"otherSet":[{"first_name":"Json","last_name":"Serializer","calls":null},{"first_name":"Item","last_name":"Parsing","calls":null}],"thirdSet":["theTest","theTest2"],"calls":null,"count":4,"aClass":{"test":"ItWorks"},"timestamp":"20210415","otherTimestamp":"2021-04-05T06:41:00-04:00","thirdTimestamp":"2021-04-15T20:56:24-04:00","fourthTimestamp":"20210405","timezoneId":"America\/New_York"}',
             $data
         );
     }
diff --git a/FeastTests/Mocks/TestJsonItem.php b/FeastTests/Mocks/TestJsonItem.php
index 2efa0c8..7ebb5cf 100644
--- a/FeastTests/Mocks/TestJsonItem.php
+++ b/FeastTests/Mocks/TestJsonItem.php
@@ -84,6 +84,9 @@ class TestJsonItem
 
     #[JsonItem(dateFormat: 'Ymd')]
     public DateTime $fourthTimestamp;
+    
+    #[JsonItem(timezoneId: 'America/New_York')]
+    public string $timezoneId;
 
     #[JsonItem(included: false)]
     public string $notIncluded;
diff --git a/Json.php b/Json.php
index 6cf11f1..ab974f5 100644
--- a/Json.php
+++ b/Json.php
@@ -192,6 +192,7 @@ protected static function getClassParamInfo(
             $dateFormat = Date::ATOM;
             $included = true;
             $omitEmpty = false;
+            $timezoneId = null;
             $attributes = $property->getAttributes(JsonItem::class);
             foreach ($attributes as $attribute) {
                 /** @var JsonItem $attributeObject */
@@ -201,13 +202,15 @@ protected static function getClassParamInfo(
                 $dateFormat = $attributeObject->dateFormat;
                 $included = $attributeObject->included;
                 $omitEmpty = $attributeObject->omitEmpty;
+                $timezoneId = $attributeObject->timezoneId;
             }
             $return[$property->getName()] = [
                 'name' => $name,
                 'type' => $type,
                 'dateFormat' => $dateFormat,
                 'included' => $included,
-                'omitEmpty' => $omitEmpty
+                'omitEmpty' => $omitEmpty,
+                'timezoneId' => $timezoneId
             ];
         }
         return $return;