diff --git a/src/Support/Generator/TypeTransformer.php b/src/Support/Generator/TypeTransformer.php
index 30978b9a..50706d58 100644
--- a/src/Support/Generator/TypeTransformer.php
+++ b/src/Support/Generator/TypeTransformer.php
@@ -2,6 +2,7 @@
 
 namespace Dedoc\Scramble\Support\Generator;
 
+use Carbon\CarbonInterface;
 use Dedoc\Scramble\Infer;
 use Dedoc\Scramble\OpenApiContext;
 use Dedoc\Scramble\PhpDoc\PhpDocTypeHelper;
@@ -181,7 +182,11 @@ public function transform(Type $type)
         } elseif ($type instanceof \Dedoc\Scramble\Support\Type\MixedType) {
             $openApiType = new MixedType;
         } elseif ($type instanceof \Dedoc\Scramble\Support\Type\ObjectType) {
-            $openApiType = new ObjectType;
+            if ($type->isInstanceOf(CarbonInterface::class)) {
+                $openApiType = (new StringType)->format('date-time');
+            } else {
+                $openApiType = new ObjectType;
+            }
         } elseif ($type instanceof \Dedoc\Scramble\Support\Type\IntersectionType) {
             $openApiType = (new AllOf)->setItems(array_filter(array_map(
                 fn ($t) => $this->transform($t),
diff --git a/tests/Files/SamplePostModel.php b/tests/Files/SamplePostModel.php
index b447b16c..13d54e4f 100644
--- a/tests/Files/SamplePostModel.php
+++ b/tests/Files/SamplePostModel.php
@@ -18,6 +18,7 @@ class SamplePostModel extends Model
         'read_time' => 'int',
         'status' => Status::class,
         'settings' => 'array',
+        'approved_at' => 'datetime',
     ];
 
     public function getReadTimeAttribute()
diff --git a/tests/InferExtensions/ModelExtensionTest.php b/tests/InferExtensions/ModelExtensionTest.php
index 42b10f45..0a009b15 100644
--- a/tests/InferExtensions/ModelExtensionTest.php
+++ b/tests/InferExtensions/ModelExtensionTest.php
@@ -30,6 +30,7 @@
         'title' => 'string',
         'settings' => 'array<mixed>|null',
         'body' => 'string',
+        'approved_at' => 'Carbon\Carbon|null',
         'created_at' => 'Carbon\Carbon|null',
         'updated_at' => 'Carbon\Carbon|null',
         /* Appended attributes */
diff --git a/tests/__snapshots__/InferTypesTest__it_infers_model_type__1.yml b/tests/__snapshots__/InferTypesTest__it_infers_model_type__1.yml
index e1446eb6..e884b6eb 100644
--- a/tests/__snapshots__/InferTypesTest__it_infers_model_type__1.yml
+++ b/tests/__snapshots__/InferTypesTest__it_infers_model_type__1.yml
@@ -6,6 +6,7 @@ properties:
     title: { type: string }
     settings: { type: [array, 'null'], items: {  } }
     body: { type: string }
+    approved_at: { type: [string, 'null'], format: date-time }
     created_at: { type: [string, 'null'], format: date-time }
     updated_at: { type: [string, 'null'], format: date-time }
     parent: { $ref: '#/components/schemas/SamplePostModel' }
@@ -18,5 +19,6 @@ required:
     - title
     - settings
     - body
+    - approved_at
     - created_at
     - updated_at
diff --git a/tests/__snapshots__/InferTypesTest__it_infers_model_type_when_toArray_is_implemented__1.yml b/tests/__snapshots__/InferTypesTest__it_infers_model_type_when_toArray_is_implemented__1.yml
index 994f75d6..8e519c24 100644
--- a/tests/__snapshots__/InferTypesTest__it_infers_model_type_when_toArray_is_implemented__1.yml
+++ b/tests/__snapshots__/InferTypesTest__it_infers_model_type_when_toArray_is_implemented__1.yml
@@ -4,7 +4,7 @@ properties:
     children: { type: array, items: { $ref: '#/components/schemas/SamplePostModelWithToArray' } }
     read_time: { type: string }
     user: { $ref: '#/components/schemas/SampleUserModel' }
-    created_at: { type: [object, 'null'] }
+    created_at: { type: [string, 'null'], format: date-time }
 required:
     - id
     - children
diff --git a/tests/migrations/2016_01_01_000000_create_posts_table.php b/tests/migrations/2016_01_01_000000_create_posts_table.php
index b439eb8a..04c1e5d8 100644
--- a/tests/migrations/2016_01_01_000000_create_posts_table.php
+++ b/tests/migrations/2016_01_01_000000_create_posts_table.php
@@ -20,6 +20,7 @@ public function up()
             $table->string('title');
             $table->json('settings')->nullable();
             $table->text('body');
+            $table->dateTime('approved_at')->nullable();
             $table->timestamps();
         });
     }