diff --git a/Android.bp b/Android.bp
index 9eb73a9..94ca120 100644
--- a/Android.bp
+++ b/Android.bp
@@ -100,6 +100,7 @@
         "core/java/android/app/backup/ISelectBackupTransportCallback.aidl",
         "core/java/android/app/slice/ISliceManager.aidl",
         "core/java/android/app/slice/ISliceListener.aidl",
+        "core/java/android/app/timedetector/ITimeDetectorService.aidl",
         "core/java/android/app/timezone/ICallback.aidl",
         "core/java/android/app/timezone/IRulesManager.aidl",
         "core/java/android/app/usage/ICacheQuotaService.aidl",
diff --git a/core/java/android/app/SystemServiceRegistry.java b/core/java/android/app/SystemServiceRegistry.java
index db011da..4a7f49d 100644
--- a/core/java/android/app/SystemServiceRegistry.java
+++ b/core/java/android/app/SystemServiceRegistry.java
@@ -24,6 +24,7 @@
 import android.app.job.IJobScheduler;
 import android.app.job.JobScheduler;
 import android.app.slice.SliceManager;
+import android.app.timedetector.TimeDetector;
 import android.app.timezone.RulesManager;
 import android.app.trust.TrustManager;
 import android.app.usage.IStorageStatsManager;
@@ -997,6 +998,14 @@
                                         Context.DEVICE_IDLE_CONTROLLER));
                         return new DeviceIdleManager(ctx.getOuterContext(), service);
                     }});
+
+        registerService(Context.TIME_DETECTOR_SERVICE, TimeDetector.class,
+                new CachedServiceFetcher<TimeDetector>() {
+                    @Override
+                    public TimeDetector createService(ContextImpl ctx)
+                            throws ServiceNotFoundException {
+                        return new TimeDetector();
+                    }});
     }
 
     /**
diff --git a/core/java/android/app/timedetector/ITimeDetectorService.aidl b/core/java/android/app/timedetector/ITimeDetectorService.aidl
new file mode 100644
index 0000000..bdbe111
--- /dev/null
+++ b/core/java/android/app/timedetector/ITimeDetectorService.aidl
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.app.timedetector;
+
+/**
+ * System private API to comunicate with time detector service.
+ *
+ * <p>Used by parts of the Android system with signals associated with the device's time to provide
+ * information to the Time Detector Service.
+ *
+ * <p>Use the {@link android.app.timedetector.TimeDetector} class rather than going through
+ * this Binder interface directly. See {@link android.app.timedetector.TimeDetectorService} for
+ * more complete documentation.
+ *
+ *
+ * {@hide}
+ */
+interface ITimeDetectorService {
+  void stubbedCall();
+}
diff --git a/core/java/android/app/timedetector/TimeDetector.java b/core/java/android/app/timedetector/TimeDetector.java
new file mode 100644
index 0000000..ac1e223
--- /dev/null
+++ b/core/java/android/app/timedetector/TimeDetector.java
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.app.timedetector;
+
+import android.annotation.SystemService;
+import android.content.Context;
+import android.os.RemoteException;
+import android.os.ServiceManager;
+import android.os.ServiceManager.ServiceNotFoundException;
+import android.util.Log;
+
+/**
+ * The interface through which system components can send signals to the TimeDetectorService.
+ * @hide
+ */
+@SystemService(Context.TIME_DETECTOR_SERVICE)
+public final class TimeDetector {
+    private static final String TAG = "timedetector.TimeDetector";
+    private static final boolean DEBUG = false;
+
+    private final ITimeDetectorService mITimeDetectorService;
+
+    public TimeDetector() throws ServiceNotFoundException {
+        mITimeDetectorService = ITimeDetectorService.Stub.asInterface(
+                ServiceManager.getServiceOrThrow(Context.TIME_DETECTOR_SERVICE));
+    }
+
+    /**
+     * Does nothing.
+     * TODO: Remove this when the service implementation is built out.
+     */
+    public void stubbedCall() {
+        if (DEBUG) {
+            Log.d(TAG, "stubbedCall called");
+        }
+        try {
+            mITimeDetectorService.stubbedCall();
+        } catch (RemoteException e) {
+            throw e.rethrowFromSystemServer();
+        }
+    }
+
+}
diff --git a/core/java/android/content/Context.java b/core/java/android/content/Context.java
index 133f339..1da77a2 100644
--- a/core/java/android/content/Context.java
+++ b/core/java/android/content/Context.java
@@ -3059,6 +3059,7 @@
             COMPANION_DEVICE_SERVICE,
             CROSS_PROFILE_APPS_SERVICE,
             //@hide: SYSTEM_UPDATE_SERVICE,
+            //@hide: TIME_DETECTOR_SERVICE,
     })
     @Retention(RetentionPolicy.SOURCE)
     public @interface ServiceName {}
@@ -4211,6 +4212,15 @@
     public static final String SECURE_ELEMENT_SERVICE = "secure_element";
 
     /**
+     * Use with {@link #getSystemService(String)} to retrieve an
+     * {@link android.app.timedetector.ITimeDetectorService}.
+     * @hide
+     *
+     * @see #getSystemService(String)
+     */
+    public static final String TIME_DETECTOR_SERVICE = "time_detector";
+
+    /**
      * Determine whether the given permission is allowed for a particular
      * process and user ID running in the system.
      *
diff --git a/services/core/java/com/android/server/timedetector/TimeDetectorService.java b/services/core/java/com/android/server/timedetector/TimeDetectorService.java
new file mode 100644
index 0000000..0b63e29
--- /dev/null
+++ b/services/core/java/com/android/server/timedetector/TimeDetectorService.java
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.server.timedetector;
+
+import com.android.internal.util.DumpUtils;
+import com.android.server.SystemService;
+
+import android.app.timedetector.ITimeDetectorService;
+import android.content.Context;
+import android.util.Slog;
+
+import java.io.FileDescriptor;
+import java.io.PrintWriter;
+
+public final class TimeDetectorService extends ITimeDetectorService.Stub {
+
+    private static final String TAG = "timedetector.TimeDetectorService";
+
+    public static class Lifecycle extends SystemService {
+
+        public Lifecycle(Context context) {
+            super(context);
+        }
+
+        @Override
+        public void onStart() {
+            TimeDetectorService service = TimeDetectorService.create(getContext());
+
+            // Publish the binder service so it can be accessed from other (appropriately
+            // permissioned) processes.
+            publishBinderService(Context.TIME_DETECTOR_SERVICE, service);
+        }
+    }
+
+    private final Context mContext;
+
+    private static TimeDetectorService create(Context context) {
+        return new TimeDetectorService(context);
+    }
+
+    public TimeDetectorService(Context context) {
+        mContext = context;
+    }
+
+    @Override
+    public void stubbedCall() {
+        // Empty call for initial tests.
+        Slog.d(TAG, "stubbedCall() called");
+        // TODO(nfuller): Remove when there are real methods.
+    }
+
+    @Override
+    protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
+        if (!DumpUtils.checkDumpPermission(mContext, TAG, pw)) return;
+
+        // TODO(nfuller): Implement when there is state.
+    }
+}
\ No newline at end of file
diff --git a/services/java/com/android/server/SystemServer.java b/services/java/com/android/server/SystemServer.java
index d369e0d..a37a29c 100644
--- a/services/java/com/android/server/SystemServer.java
+++ b/services/java/com/android/server/SystemServer.java
@@ -229,6 +229,8 @@
             "com.android.server.slice.SliceManagerService$Lifecycle";
     private static final String CAR_SERVICE_HELPER_SERVICE_CLASS =
             "com.android.internal.car.CarServiceHelperService";
+    private static final String TIME_DETECTOR_SERVICE_CLASS =
+            "com.android.server.timedetector.TimeDetectorService$Lifecycle";
 
     private static final String PERSISTENT_DATA_BLOCK_PROP = "ro.frp.pst";
 
@@ -1237,6 +1239,14 @@
             }
             traceEnd();
 
+            traceBeginAndSlog("StartTimeDetectorService");
+            try {
+                mSystemServiceManager.startService(TIME_DETECTOR_SERVICE_CLASS);
+            } catch (Throwable e) {
+                reportWtf("starting StartTimeDetectorService service", e);
+            }
+            traceEnd();
+
             if (!isWatch) {
                 traceBeginAndSlog("StartSearchManagerService");
                 try {
diff --git a/services/tests/servicestests/src/com/android/server/timedetector/TimeDetectorServiceTest.java b/services/tests/servicestests/src/com/android/server/timedetector/TimeDetectorServiceTest.java
new file mode 100644
index 0000000..dc17eeb
--- /dev/null
+++ b/services/tests/servicestests/src/com/android/server/timedetector/TimeDetectorServiceTest.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.server.timedetector;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+/**
+ * Unit tests for the {@link TimeDetectorService}.
+ */
+@RunWith(AndroidJUnit4.class)
+public class TimeDetectorServiceTest {
+
+    private TimeDetectorService mTimeDetectorService;
+
+    @Before
+    public void setUp() {
+        final Context context = InstrumentationRegistry.getContext();
+        mTimeDetectorService = new TimeDetectorService(context);
+    }
+
+    @Test
+    public void testStubbedCall() {
+        mTimeDetectorService.stubbedCall();
+    }
+
+}