diff --git a/dom/events/DeviceMotionEvent.cpp b/dom/events/DeviceMotionEvent.cpp
index b78241ef094b..7e6b882395a1 100644
--- a/dom/events/DeviceMotionEvent.cpp
+++ b/dom/events/DeviceMotionEvent.cpp
@@ -34,6 +34,22 @@ DeviceMotionEvent::InitDeviceMotionEvent(
                      const DeviceAccelerationInit& aAccelIncludingGravity,
                      const DeviceRotationRateInit& aRotationRate,
                      Nullable<double> aInterval)
+{
+  InitDeviceMotionEvent(aType, aCanBubble, aCancelable, aAcceleration,
+                        aAccelIncludingGravity, aRotationRate, aInterval,
+                        Nullable<uint64_t>());
+}
+
+void
+DeviceMotionEvent::InitDeviceMotionEvent(
+                     const nsAString& aType,
+                     bool aCanBubble,
+                     bool aCancelable,
+                     const DeviceAccelerationInit& aAcceleration,
+                     const DeviceAccelerationInit& aAccelIncludingGravity,
+                     const DeviceRotationRateInit& aRotationRate,
+                     Nullable<double> aInterval,
+                     Nullable<uint64_t> aTimeStamp)
 {
   Event::InitEvent(aType, aCanBubble, aCancelable);
 
@@ -50,6 +66,9 @@ DeviceMotionEvent::InitDeviceMotionEvent(
                                          aRotationRate.mBeta,
                                          aRotationRate.mGamma);
   mInterval = aInterval;
+  if (!aTimeStamp.IsNull()) {
+    mEvent->mTime = aTimeStamp.Value();
+  }
 }
 
 already_AddRefed<DeviceMotionEvent>
@@ -141,7 +160,7 @@ using namespace mozilla::dom;
 already_AddRefed<DeviceMotionEvent>
 NS_NewDOMDeviceMotionEvent(EventTarget* aOwner,
                            nsPresContext* aPresContext,
-                           WidgetEvent* aEvent) 
+                           WidgetEvent* aEvent)
 {
   RefPtr<DeviceMotionEvent> it =
     new DeviceMotionEvent(aOwner, aPresContext, aEvent);
diff --git a/dom/events/DeviceMotionEvent.h b/dom/events/DeviceMotionEvent.h
index ca631787d865..6e6f3d9e5f54 100644
--- a/dom/events/DeviceMotionEvent.h
+++ b/dom/events/DeviceMotionEvent.h
@@ -130,6 +130,16 @@ public:
          const DeviceRotationRateInit& aRotationRate,
          Nullable<double> aInterval);
 
+  void InitDeviceMotionEvent(
+         const nsAString& aType,
+         bool aCanBubble,
+         bool aCancelable,
+         const DeviceAccelerationInit& aAcceleration,
+         const DeviceAccelerationInit& aAccelerationIncludingGravity,
+         const DeviceRotationRateInit& aRotationRate,
+         Nullable<double> aInterval,
+         Nullable<uint64_t> aTimeStamp);
+
   static already_AddRefed<DeviceMotionEvent>
   Constructor(const GlobalObject& aGlobal,
               const nsAString& aType,
diff --git a/dom/system/nsDeviceSensors.cpp b/dom/system/nsDeviceSensors.cpp
index 4aed0227055c..d04239b95252 100644
--- a/dom/system/nsDeviceSensors.cpp
+++ b/dom/system/nsDeviceSensors.cpp
@@ -332,6 +332,7 @@ nsDeviceSensors::Notify(const mozilla::hal::SensorData& aSensorData)
   double y = len > 1 ? values[1] : 0.0;
   double z = len > 2 ? values[2] : 0.0;
   double w = len > 3 ? values[3] : 0.0;
+  PRTime timestamp = aSensorData.timestamp();
 
   nsCOMArray<nsIDOMWindow> windowListeners;
   for (uint32_t i = 0; i < mWindowListeners[type]->Length(); i++) {
@@ -351,7 +352,7 @@ nsDeviceSensors::Notify(const mozilla::hal::SensorData& aSensorData)
       if (type == nsIDeviceSensorData::TYPE_ACCELERATION ||
         type == nsIDeviceSensorData::TYPE_LINEAR_ACCELERATION ||
         type == nsIDeviceSensorData::TYPE_GYROSCOPE) {
-        FireDOMMotionEvent(domDoc, target, type, x, y, z);
+        FireDOMMotionEvent(domDoc, target, type, timestamp, x, y, z);
       } else if (type == nsIDeviceSensorData::TYPE_ORIENTATION) {
         FireDOMOrientationEvent(target, x, y, z, Orientation::kAbsolute);
       } else if (type == nsIDeviceSensorData::TYPE_ROTATION_VECTOR) {
@@ -488,6 +489,7 @@ void
 nsDeviceSensors::FireDOMMotionEvent(nsIDOMDocument *domdoc,
                                     EventTarget* target,
                                     uint32_t type,
+                                    PRTime timestamp,
                                     double x,
                                     double y,
                                     double z)
@@ -553,7 +555,8 @@ nsDeviceSensors::FireDOMMotionEvent(nsIDOMDocument *domdoc,
                             *mLastAcceleration,
                             *mLastAccelerationIncludingGravity,
                             *mLastRotationRate,
-                            Nullable<double>(DEFAULT_SENSOR_POLL));
+                            Nullable<double>(DEFAULT_SENSOR_POLL),
+                            Nullable<uint64_t>(timestamp));
 
   event->SetTrusted(true);
 
diff --git a/dom/system/nsDeviceSensors.h b/dom/system/nsDeviceSensors.h
index 6f7df48d9a3b..bed6cd69d9ef 100644
--- a/dom/system/nsDeviceSensors.h
+++ b/dom/system/nsDeviceSensors.h
@@ -63,6 +63,7 @@ private:
   void FireDOMMotionEvent(class nsIDOMDocument *domDoc,
                           mozilla::dom::EventTarget* target,
                           uint32_t type,
+                          PRTime timestamp,
                           double x,
                           double y,
                           double z);
diff --git a/mobile/android/base/java/org/mozilla/gecko/GeckoEvent.java b/mobile/android/base/java/org/mozilla/gecko/GeckoEvent.java
index d140c5e1176d..26a4731928f8 100644
--- a/mobile/android/base/java/org/mozilla/gecko/GeckoEvent.java
+++ b/mobile/android/base/java/org/mozilla/gecko/GeckoEvent.java
@@ -451,6 +451,9 @@ public class GeckoEvent {
             }
             break;
         }
+
+        // SensorEvent timestamp is in nanoseconds, Gecko expects microseconds.
+        event.mTime = s.timestamp / 1000;
         return event;
     }
 
diff --git a/widget/android/AndroidJavaWrappers.cpp b/widget/android/AndroidJavaWrappers.cpp
index 05c8932b01f8..6046ffa3e0c1 100644
--- a/widget/android/AndroidJavaWrappers.cpp
+++ b/widget/android/AndroidJavaWrappers.cpp
@@ -376,6 +376,7 @@ AndroidGeckoEvent::Init(JNIEnv *jenv, jobject jobj)
              mW = jenv->GetDoubleField(jobj, jWField);
              mFlags = jenv->GetIntField(jobj, jFlagsField);
              mMetaState = jenv->GetIntField(jobj, jMetaStateField);
+             mTime = jenv->GetLongField(jobj, jTimeField);
              break;
 
         case LOCATION_EVENT: {
diff --git a/widget/android/nsAppShell.cpp b/widget/android/nsAppShell.cpp
index 781ed3b85c3b..c1899450dbd4 100644
--- a/widget/android/nsAppShell.cpp
+++ b/widget/android/nsAppShell.cpp
@@ -575,7 +575,7 @@ nsAppShell::LegacyGeckoEvent::Run()
         }
 
         const hal::SensorAccuracyType &accuracy = (hal::SensorAccuracyType) curEvent->MetaState();
-        hal::SensorData sdata(type, PR_Now(), values, accuracy);
+        hal::SensorData sdata(type, curEvent->Time(), values, accuracy);
         hal::NotifySensorChange(sdata);
       }
       break;