diff --git a/core/api/system-current.txt b/core/api/system-current.txt
index 5a8ee9456f878..99688c78d7ec9 100644
--- a/core/api/system-current.txt
+++ b/core/api/system-current.txt
@@ -13042,6 +13042,7 @@ package android.service.voice {
     method @Nullable public android.media.AudioFormat getCaptureAudioFormat();
     method @Nullable public byte[] getData();
     method public int getDataFormat();
+    method public long getHalEventReceivedMillis();
     method @Nullable public android.service.voice.HotwordDetectedResult getHotwordDetectedResult();
     method @NonNull public java.util.List<android.hardware.soundtrigger.SoundTrigger.KeyphraseRecognitionExtra> getKeyphraseRecognitionExtras();
     method @Deprecated @Nullable public byte[] getTriggerAudio();
diff --git a/core/api/test-current.txt b/core/api/test-current.txt
index 5a84b9782ee63..ceb883b0340cb 100644
--- a/core/api/test-current.txt
+++ b/core/api/test-current.txt
@@ -2875,7 +2875,7 @@ package android.service.voice {
   public class AlwaysOnHotwordDetector implements android.service.voice.HotwordDetector {
     method public void overrideAvailability(int);
     method public void resetAvailability();
-    method @RequiresPermission(allOf={android.Manifest.permission.RECORD_AUDIO, android.Manifest.permission.CAPTURE_AUDIO_HOTWORD}) public void triggerHardwareRecognitionEventForTest(int, int, boolean, int, int, int, boolean, @NonNull android.media.AudioFormat, @Nullable byte[], @NonNull java.util.List<android.hardware.soundtrigger.SoundTrigger.KeyphraseRecognitionExtra>);
+    method @RequiresPermission(allOf={android.Manifest.permission.RECORD_AUDIO, android.Manifest.permission.CAPTURE_AUDIO_HOTWORD}) public void triggerHardwareRecognitionEventForTest(int, int, long, boolean, int, int, int, boolean, @NonNull android.media.AudioFormat, @Nullable byte[], @NonNull java.util.List<android.hardware.soundtrigger.SoundTrigger.KeyphraseRecognitionExtra>);
   }
 
   public static final class AlwaysOnHotwordDetector.EventPayload.Builder {
@@ -2887,6 +2887,7 @@ package android.service.voice {
     method @NonNull public android.service.voice.AlwaysOnHotwordDetector.EventPayload.Builder setCaptureSession(int);
     method @NonNull public android.service.voice.AlwaysOnHotwordDetector.EventPayload.Builder setData(@NonNull byte[]);
     method @NonNull public android.service.voice.AlwaysOnHotwordDetector.EventPayload.Builder setDataFormat(int);
+    method @NonNull public android.service.voice.AlwaysOnHotwordDetector.EventPayload.Builder setHalEventReceivedMillis(long);
     method @NonNull public android.service.voice.AlwaysOnHotwordDetector.EventPayload.Builder setHotwordDetectedResult(@NonNull android.service.voice.HotwordDetectedResult);
     method @NonNull public android.service.voice.AlwaysOnHotwordDetector.EventPayload.Builder setKeyphraseRecognitionExtras(@NonNull java.util.List<android.hardware.soundtrigger.SoundTrigger.KeyphraseRecognitionExtra>);
   }
diff --git a/core/java/android/service/voice/AlwaysOnHotwordDetector.java b/core/java/android/service/voice/AlwaysOnHotwordDetector.java
index ffa15f065a027..65f32e2cf4428 100644
--- a/core/java/android/service/voice/AlwaysOnHotwordDetector.java
+++ b/core/java/android/service/voice/AlwaysOnHotwordDetector.java
@@ -20,6 +20,7 @@ import static android.Manifest.permission.CAPTURE_AUDIO_HOTWORD;
 import static android.Manifest.permission.RECORD_AUDIO;
 import static android.service.voice.VoiceInteractionService.MULTIPLE_ACTIVE_HOTWORD_DETECTORS;
 
+import android.annotation.ElapsedRealtimeLong;
 import android.annotation.IntDef;
 import android.annotation.NonNull;
 import android.annotation.Nullable;
@@ -54,6 +55,7 @@ import android.os.ParcelFileDescriptor;
 import android.os.PersistableBundle;
 import android.os.RemoteException;
 import android.os.SharedMemory;
+import android.os.SystemClock;
 import android.text.TextUtils;
 import android.util.Log;
 import android.util.Slog;
@@ -401,6 +403,9 @@ public class AlwaysOnHotwordDetector extends AbstractDetector {
         private final ParcelFileDescriptor mAudioStream;
         private final List<KeyphraseRecognitionExtra> mKephraseExtras;
 
+        @ElapsedRealtimeLong
+        private final long mHalEventReceivedMillis;
+
         private EventPayload(boolean captureAvailable,
                 @Nullable AudioFormat audioFormat,
                 int captureSession,
@@ -408,7 +413,8 @@ public class AlwaysOnHotwordDetector extends AbstractDetector {
                 @Nullable byte[] data,
                 @Nullable HotwordDetectedResult hotwordDetectedResult,
                 @Nullable ParcelFileDescriptor audioStream,
-                @NonNull List<KeyphraseRecognitionExtra> keyphraseExtras) {
+                @NonNull List<KeyphraseRecognitionExtra> keyphraseExtras,
+                @ElapsedRealtimeLong long halEventReceivedMillis) {
             mCaptureAvailable = captureAvailable;
             mCaptureSession = captureSession;
             mAudioFormat = audioFormat;
@@ -417,6 +423,7 @@ public class AlwaysOnHotwordDetector extends AbstractDetector {
             mHotwordDetectedResult = hotwordDetectedResult;
             mAudioStream = audioStream;
             mKephraseExtras = keyphraseExtras;
+            mHalEventReceivedMillis = halEventReceivedMillis;
         }
 
         /**
@@ -545,6 +552,21 @@ public class AlwaysOnHotwordDetector extends AbstractDetector {
             return mKephraseExtras;
         }
 
+        /**
+         * Timestamp of when the trigger event from SoundTriggerHal was received by the system
+         * server.
+         *
+         * Clock monotonic including suspend time or its equivalent on the system,
+         * in the same units and timebase as {@link SystemClock#elapsedRealtime()}.
+         *
+         * @return Elapsed realtime in milliseconds when the event was received from the HAL.
+         *      Returns -1 if the event was not generated from the HAL.
+         */
+        @ElapsedRealtimeLong
+        public long getHalEventReceivedMillis() {
+            return mHalEventReceivedMillis;
+        }
+
         /**
          * Builder class for {@link EventPayload} objects
          *
@@ -561,6 +583,8 @@ public class AlwaysOnHotwordDetector extends AbstractDetector {
             private HotwordDetectedResult mHotwordDetectedResult = null;
             private ParcelFileDescriptor mAudioStream = null;
             private List<KeyphraseRecognitionExtra> mKeyphraseExtras = Collections.emptyList();
+            @ElapsedRealtimeLong
+            private long mHalEventReceivedMillis = -1;
 
             public Builder() {}
 
@@ -681,6 +705,20 @@ public class AlwaysOnHotwordDetector extends AbstractDetector {
                 return this;
             }
 
+            /**
+             * Timestamp of when the trigger event from SoundTriggerHal was received by the
+             * framework.
+             *
+             * Clock monotonic including suspend time or its equivalent on the system,
+             * in the same units and timebase as {@link SystemClock#elapsedRealtime()}.
+             */
+            @NonNull
+            public Builder setHalEventReceivedMillis(
+                    @ElapsedRealtimeLong long halEventReceivedMillis) {
+                mHalEventReceivedMillis = halEventReceivedMillis;
+                return this;
+            }
+
             /**
              * Builds an {@link EventPayload} instance
              */
@@ -688,7 +726,7 @@ public class AlwaysOnHotwordDetector extends AbstractDetector {
             public EventPayload build() {
                 return new EventPayload(mCaptureAvailable, mAudioFormat, mCaptureSession,
                         mDataFormat, mData, mHotwordDetectedResult, mAudioStream,
-                        mKeyphraseExtras);
+                        mKeyphraseExtras, mHalEventReceivedMillis);
             }
         }
     }
@@ -897,8 +935,9 @@ public class AlwaysOnHotwordDetector extends AbstractDetector {
     @TestApi
     @RequiresPermission(allOf = {RECORD_AUDIO, CAPTURE_AUDIO_HOTWORD})
     public void triggerHardwareRecognitionEventForTest(int status, int soundModelHandle,
-            boolean captureAvailable, int captureSession, int captureDelayMs, int capturePreambleMs,
-            boolean triggerInData, @NonNull AudioFormat captureFormat, @Nullable byte[] data,
+            @ElapsedRealtimeLong long halEventReceivedMillis, boolean captureAvailable,
+            int captureSession, int captureDelayMs, int capturePreambleMs, boolean triggerInData,
+            @NonNull AudioFormat captureFormat, @Nullable byte[] data,
             @NonNull List<KeyphraseRecognitionExtra> keyphraseRecognitionExtras) {
         Log.d(TAG, "triggerHardwareRecognitionEventForTest()");
         synchronized (mLock) {