diff --git a/android/src/main/java/io/invertase/firebase/firestore/FirestoreSerialize.java b/android/src/main/java/io/invertase/firebase/firestore/FirestoreSerialize.java
index 3cb96896..dd4e3626 100644
--- a/android/src/main/java/io/invertase/firebase/firestore/FirestoreSerialize.java
+++ b/android/src/main/java/io/invertase/firebase/firestore/FirestoreSerialize.java
@@ -30,7 +30,7 @@ import io.invertase.firebase.Utils;
 
 public class FirestoreSerialize {
   private static final String TAG = "FirestoreSerialize";
-  private static final DateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
+  private static final DateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSX");
   private static final String KEY_CHANGES = "changes";
   private static final String KEY_DATA = "data";
   private static final String KEY_DOC_CHANGE_DOCUMENT = "document";
diff --git a/tests/src/tests/firestore/documentReferenceTests.js b/tests/src/tests/firestore/documentReferenceTests.js
index bc4a39e0..968cb28b 100644
--- a/tests/src/tests/firestore/documentReferenceTests.js
+++ b/tests/src/tests/firestore/documentReferenceTests.js
@@ -426,13 +426,15 @@ function documentReferenceTests({ describe, it, context, firebase }) {
 
     context('types', () => {
       it('should handle Date field', async () => {
+        const date = new Date();
         const docRef = firebase.native.firestore().doc('document-tests/reference');
         await docRef.set({
-          field: new Date(),
+          field: date,
         });
 
         const doc = await docRef.get();
         doc.data().field.should.be.instanceof(Date);
+        should.equal(doc.data().field.toISOString(), date.toISOString());
       });
     });