diff --git a/src/graphql/typeDefs/index.ts b/src/graphql/typeDefs/index.ts
index 316e384..e7c5f96 100644
--- a/src/graphql/typeDefs/index.ts
+++ b/src/graphql/typeDefs/index.ts
@@ -34,7 +34,7 @@ export default gql`
   type ArduinoSensorData {
     _id: ID!
     data: Int
-    date: Int
+    date: String
   }
 
   type ArduinoSensor {