diff --git a/packages/datastore/__tests__/outbox.test.ts b/packages/datastore/__tests__/outbox.test.ts
index 9636553ddf5..d51363bb1e7 100644
--- a/packages/datastore/__tests__/outbox.test.ts
+++ b/packages/datastore/__tests__/outbox.test.ts
@@ -142,6 +142,8 @@ describe('Outbox tests', () => {
 			_version: (updatedModel1 as any)._version + 1, // increment version like we would expect coming back from AppSync
 			_lastChangedAt: Date.now(),
 			_deleted: false,
+			createdAt: '2021-11-30T20:51:00.250Z',
+			updatedAt: '2021-11-30T20:52:00.250Z',
 		};
 
 		await Storage.runExclusive(async s => {
@@ -166,6 +168,8 @@ describe('Outbox tests', () => {
 				_version: inProgressData._version + 1, // increment version like we would expect coming back from AppSync
 				_lastChangedAt: Date.now(),
 				_deleted: false,
+				createdAt: '2021-11-30T20:51:00.250Z',
+				updatedAt: '2021-11-30T20:52:00.250Z',
 			};
 
 			await processMutationResponse(
@@ -320,9 +324,8 @@ async function instantiateOutbox(): Promise<void> {
 	Storage = <StorageType>DataStore.storage;
 	anyStorage = Storage;
 
-	const namespaceResolver = anyStorage.storage.namespaceResolver.bind(
-		anyStorage
-	);
+	const namespaceResolver =
+		anyStorage.storage.namespaceResolver.bind(anyStorage);
 
 	({ modelInstanceCreator } = anyStorage.storage);
 
diff --git a/packages/datastore/src/sync/outbox.ts b/packages/datastore/src/sync/outbox.ts
index 52205ea58df..f5167595591 100644
--- a/packages/datastore/src/sync/outbox.ts
+++ b/packages/datastore/src/sync/outbox.ts
@@ -12,7 +12,7 @@ import {
 	PersistentModelConstructor,
 	QueryOne,
 } from '../types';
-import { SYNC, valuesEqual } from '../util';
+import { USER, SYNC, valuesEqual } from '../util';
 import { TransformerMutationType } from './utils';
 
 // TODO: Persist deleted ids
@@ -31,9 +31,8 @@ class MutationEventOutbox {
 		mutationEvent: MutationEvent
 	): Promise<void> {
 		storage.runExclusive(async s => {
-			const mutationEventModelDefinition = this.schema.namespaces[SYNC].models[
-				'MutationEvent'
-			];
+			const mutationEventModelDefinition =
+				this.schema.namespaces[SYNC].models['MutationEvent'];
 
 			const predicate = ModelPredicateCreator.createFromExisting<MutationEvent>(
 				mutationEventModelDefinition,
@@ -124,8 +123,8 @@ class MutationEventOutbox {
 		storage: StorageFacade,
 		model: T
 	): Promise<MutationEvent[]> {
-		const mutationEventModelDefinition = this.schema.namespaces[SYNC].models
-			.MutationEvent;
+		const mutationEventModelDefinition =
+			this.schema.namespaces[SYNC].models.MutationEvent;
 
 		const mutationEvents = await storage.query(
 			this.MutationEvent,
@@ -161,7 +160,9 @@ class MutationEventOutbox {
 			return;
 		}
 
-		const { _version, _lastChangedAt, _deleted, ...incomingData } = record;
+		const { _version, _lastChangedAt, _deleted, ..._incomingData } = record;
+		const incomingData = this.removeTimestampFields(head.model, _incomingData);
+
 		const data = JSON.parse(head.data);
 
 		if (!data) {
@@ -172,8 +173,9 @@ class MutationEventOutbox {
 			_version: __version,
 			_lastChangedAt: __lastChangedAt,
 			_deleted: __deleted,
-			...outgoingData
+			..._outgoingData
 		} = data;
+		const outgoingData = this.removeTimestampFields(head.model, _outgoingData);
 
 		// Don't sync the version when the data in the response does not match the data
 		// in the request, i.e., when there's a handled conflict
@@ -181,9 +183,8 @@ class MutationEventOutbox {
 			return;
 		}
 
-		const mutationEventModelDefinition = this.schema.namespaces[SYNC].models[
-			'MutationEvent'
-		];
+		const mutationEventModelDefinition =
+			this.schema.namespaces[SYNC].models['MutationEvent'];
 
 		const predicate = ModelPredicateCreator.createFromExisting<MutationEvent>(
 			mutationEventModelDefinition,
@@ -222,13 +223,8 @@ class MutationEventOutbox {
 		previous: MutationEvent,
 		current: MutationEvent
 	): MutationEvent {
-		const {
-			_version,
-			id,
-			_lastChangedAt,
-			_deleted,
-			...previousData
-		} = JSON.parse(previous.data);
+		const { _version, id, _lastChangedAt, _deleted, ...previousData } =
+			JSON.parse(previous.data);
 
 		const {
 			id: __id,
@@ -252,6 +248,49 @@ class MutationEventOutbox {
 			data,
 		});
 	}
+
+	/* 
+	if a model is using custom timestamp fields
+	the custom field names will be stored in the model attributes
+
+	e.g.
+	"attributes": [
+    {
+			"type": "model",
+			"properties": {
+				"timestamps": {
+					"createdAt": "createdOn",
+					"updatedAt": "updatedOn"
+				}
+			}
+    }
+	]
+	*/
+	private removeTimestampFields(
+		model: string,
+		record: PersistentModel
+	): PersistentModel {
+		const CREATED_AT_DEFAULT_KEY = 'createdAt';
+		const UPDATED_AT_DEFAULT_KEY = 'updatedAt';
+
+		let createdTimestampKey = CREATED_AT_DEFAULT_KEY;
+		let updatedTimestampKey = UPDATED_AT_DEFAULT_KEY;
+
+		const modelAttributes = this.schema.namespaces[USER].models[
+			model
+		].attributes?.find(attr => attr.type === 'model');
+		const timestampFieldsMap = modelAttributes?.properties?.timestamps;
+
+		if (timestampFieldsMap) {
+			createdTimestampKey = timestampFieldsMap[CREATED_AT_DEFAULT_KEY];
+			updatedTimestampKey = timestampFieldsMap[UPDATED_AT_DEFAULT_KEY];
+		}
+
+		delete (record as Record<string, any>)[createdTimestampKey];
+		delete (record as Record<string, any>)[updatedTimestampKey];
+
+		return record;
+	}
 }
 
 export { MutationEventOutbox };