diff --git a/packages/@aws-cdk/custom-resource-handlers/test/custom-resources/aws-custom-resource/aws-sdk-v3-handler.test.ts b/packages/@aws-cdk/custom-resource-handlers/test/custom-resources/aws-custom-resource/aws-sdk-v3-handler.test.ts
index b670a2445b7b5..61ff7fcbd9586 100644
--- a/packages/@aws-cdk/custom-resource-handlers/test/custom-resources/aws-custom-resource/aws-sdk-v3-handler.test.ts
+++ b/packages/@aws-cdk/custom-resource-handlers/test/custom-resources/aws-custom-resource/aws-sdk-v3-handler.test.ts
@@ -789,8 +789,8 @@ test('automatic Date conversion when necessary', async () => {
               ReturnData: true,
             },
           ],
-          StartTime: new Date('2023-01-01').toString(),
-          EndTime: new Date('2023-01-02').toString(),
+          StartTime: new Date('2023-01-01'),
+          EndTime: new Date('2023-01-02'),
         },
       } satisfies AwsSdkCall),
     },