diff --git a/polyfill/XRPresentationFrame.js b/polyfill/XRPresentationFrame.js
index 481b1ed..43f9ad9 100644
--- a/polyfill/XRPresentationFrame.js
+++ b/polyfill/XRPresentationFrame.js
@@ -5,9 +5,9 @@ import MatrixMath from './fill/MatrixMath.js'
 XRPresentationFrame provides all of the values needed to render a single frame of an XR scene to the XRDisplay.
 */
 export default class XRPresentationFrame {
-	constructor(session){
+	constructor(session, timestamp){
 		this._session = session
-		this._timestamp = this._session.reality._getTimeStamp();
+		this._timestamp = this._session.reality._getTimeStamp(timestamp);
 	}
 
 	get session(){ return this._session }
diff --git a/polyfill/XRSession.js b/polyfill/XRSession.js
index e3e8a62..9f2ad6f 100644
--- a/polyfill/XRSession.js
+++ b/polyfill/XRSession.js
@@ -59,13 +59,13 @@ export default class XRSession extends EventHandlerBase {
 	}
 
     _handleRequestFrame(callback) {
-		return this._display._requestAnimationFrame(() => {
+		return this._display._requestAnimationFrame((timestamp) => {
 			if (this._skip) {
 				this._skip = false;
 				return this._handleRequestFrame(callback)
 			}
 			//this._skip = true;  // try skipping every second raf
-			const frame = this._createPresentationFrame()
+			const frame = this._createPresentationFrame(timestamp)
 			this._updateCameraAnchor(frame)
 
 			this._display._reality._handleNewFrame(frame)
@@ -177,8 +177,8 @@ export default class XRSession extends EventHandlerBase {
 		this._display._startVideoFrames();
 	}
 
-	_createPresentationFrame(){
-		return new XRPresentationFrame(this)
+	_createPresentationFrame(timestamp){
+		return new XRPresentationFrame(this, timestamp)
 	}
 
 	_getCoordinateSystem(...types){
diff --git a/polyfill/reality/CameraReality.js b/polyfill/reality/CameraReality.js
index 2d3ce38..86e380a 100644
--- a/polyfill/reality/CameraReality.js
+++ b/polyfill/reality/CameraReality.js
@@ -607,12 +607,13 @@ export default class CameraReality extends Reality {
 		}
 	}
 
-	_getTimeStamp() {
+	_getTimeStamp(timestamp) {
 		if(this._arKitWrapper !== null){
 			return this._arKitWrapper.timestamp;
 		}else{
 			// use performance.now()
-			return 	( performance || Date ).now();
+			//return 	( performance || Date ).now();
+			return timestamp
 		}
 	}
 	/*
diff --git a/polyfill/reality/VirtualReality.js b/polyfill/reality/VirtualReality.js
index 7d5d0c3..c623f82 100644
--- a/polyfill/reality/VirtualReality.js
+++ b/polyfill/reality/VirtualReality.js
@@ -73,6 +73,9 @@ export default class VirtualReality extends Reality {
 		})
 	}
 
+	_getTimeStamp(timestamp) {
+		return timestamp
+	}
 
 
 }
\ No newline at end of file