diff --git a/packages/SystemUI/src/com/android/systemui/shade/LargeScreenShadeHeaderController.kt b/packages/SystemUI/src/com/android/systemui/shade/LargeScreenShadeHeaderController.kt
index 6b540aa..5d7df0d 100644
--- a/packages/SystemUI/src/com/android/systemui/shade/LargeScreenShadeHeaderController.kt
+++ b/packages/SystemUI/src/com/android/systemui/shade/LargeScreenShadeHeaderController.kt
@@ -19,6 +19,7 @@
 import android.annotation.IdRes
 import android.app.StatusBarManager
 import android.content.res.Configuration
+import android.os.Bundle
 import android.os.Trace
 import android.os.Trace.TRACE_TAG_APP
 import android.util.Pair
@@ -34,6 +35,8 @@
 import com.android.systemui.animation.ShadeInterpolation
 import com.android.systemui.battery.BatteryMeterView
 import com.android.systemui.battery.BatteryMeterViewController
+import com.android.systemui.demomode.DemoMode
+import com.android.systemui.demomode.DemoModeController
 import com.android.systemui.dump.DumpManager
 import com.android.systemui.flags.FeatureFlags
 import com.android.systemui.flags.Flags
@@ -53,6 +56,7 @@
 import com.android.systemui.statusbar.phone.dagger.CentralSurfacesComponent.CentralSurfacesScope
 import com.android.systemui.statusbar.phone.dagger.StatusBarViewModule.LARGE_SCREEN_BATTERY_CONTROLLER
 import com.android.systemui.statusbar.phone.dagger.StatusBarViewModule.LARGE_SCREEN_SHADE_HEADER
+import com.android.systemui.statusbar.policy.Clock
 import com.android.systemui.statusbar.policy.ConfigurationController
 import com.android.systemui.statusbar.policy.VariableDateView
 import com.android.systemui.statusbar.policy.VariableDateViewController
@@ -89,7 +93,8 @@
     private val dumpManager: DumpManager,
     private val featureFlags: FeatureFlags,
     private val qsCarrierGroupControllerBuilder: QSCarrierGroupController.Builder,
-    private val combinedShadeHeadersConstraintManager: CombinedShadeHeadersConstraintManager
+    private val combinedShadeHeadersConstraintManager: CombinedShadeHeadersConstraintManager,
+    private val demoModeController: DemoModeController
 ) : ViewController<View>(header), Dumpable {
 
     companion object {
@@ -126,7 +131,7 @@
     private lateinit var qsCarrierGroupController: QSCarrierGroupController
 
     private val batteryIcon: BatteryMeterView = header.findViewById(R.id.batteryRemainingIcon)
-    private val clock: TextView = header.findViewById(R.id.clock)
+    private val clock: Clock = header.findViewById(R.id.clock)
     private val date: TextView = header.findViewById(R.id.date)
     private val iconContainer: StatusIconContainer = header.findViewById(R.id.statusIcons)
     private val qsCarrierGroup: QSCarrierGroup = header.findViewById(R.id.carrier_group)
@@ -212,6 +217,14 @@
         view.onApplyWindowInsets(insets)
     }
 
+    private val demoModeReceiver = object : DemoMode {
+        override fun demoCommands() = listOf(DemoMode.COMMAND_CLOCK)
+        override fun dispatchDemoCommand(command: String, args: Bundle) =
+            clock.dispatchDemoCommand(command, args)
+        override fun onDemoModeStarted() = clock.onDemoModeStarted()
+        override fun onDemoModeFinished() = clock.onDemoModeFinished()
+    }
+
     private val chipVisibilityListener: ChipVisibilityListener = object : ChipVisibilityListener {
         override fun onChipVisibilityRefreshed(visible: Boolean) {
             if (header is MotionLayout) {
@@ -298,6 +311,7 @@
 
         dumpManager.registerDumpable(this)
         configurationController.addCallback(configurationControllerListener)
+        demoModeController.addCallback(demoModeReceiver)
 
         updateVisibility()
         updateTransition()
@@ -307,6 +321,7 @@
         privacyIconsController.chipVisibilityListener = null
         dumpManager.unregisterDumpable(this::class.java.simpleName)
         configurationController.removeCallback(configurationControllerListener)
+        demoModeController.removeCallback(demoModeReceiver)
     }
 
     fun disable(state1: Int, state2: Int, animate: Boolean) {
@@ -524,4 +539,7 @@
             updateConstraints(LARGE_SCREEN_HEADER_CONSTRAINT, updates.largeScreenConstraintsChanges)
         }
     }
+
+    @VisibleForTesting
+    internal fun simulateViewDetached() = this.onViewDetached()
 }
diff --git a/packages/SystemUI/tests/src/com/android/systemui/shade/LargeScreenShadeHeaderControllerCombinedTest.kt b/packages/SystemUI/tests/src/com/android/systemui/shade/LargeScreenShadeHeaderControllerCombinedTest.kt
index 14a3bc1..52ab6a6 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/shade/LargeScreenShadeHeaderControllerCombinedTest.kt
+++ b/packages/SystemUI/tests/src/com/android/systemui/shade/LargeScreenShadeHeaderControllerCombinedTest.kt
@@ -35,6 +35,8 @@
 import com.android.systemui.animation.ShadeInterpolation
 import com.android.systemui.battery.BatteryMeterView
 import com.android.systemui.battery.BatteryMeterViewController
+import com.android.systemui.demomode.DemoMode
+import com.android.systemui.demomode.DemoModeController
 import com.android.systemui.dump.DumpManager
 import com.android.systemui.flags.FeatureFlags
 import com.android.systemui.flags.Flags
@@ -50,10 +52,12 @@
 import com.android.systemui.statusbar.phone.StatusBarContentInsetsProvider
 import com.android.systemui.statusbar.phone.StatusBarIconController
 import com.android.systemui.statusbar.phone.StatusIconContainer
+import com.android.systemui.statusbar.policy.Clock
 import com.android.systemui.statusbar.policy.FakeConfigurationController
 import com.android.systemui.statusbar.policy.VariableDateView
 import com.android.systemui.statusbar.policy.VariableDateViewController
 import com.android.systemui.util.mockito.any
+import com.android.systemui.util.mockito.argumentCaptor
 import com.android.systemui.util.mockito.capture
 import com.android.systemui.util.mockito.eq
 import com.android.systemui.util.mockito.mock
@@ -104,7 +108,7 @@
     @Mock
     private lateinit var featureFlags: FeatureFlags
     @Mock
-    private lateinit var clock: TextView
+    private lateinit var clock: Clock
     @Mock
     private lateinit var date: VariableDateView
     @Mock
@@ -138,6 +142,7 @@
     private lateinit var qsConstraints: ConstraintSet
     @Mock
     private lateinit var largeScreenConstraints: ConstraintSet
+    @Mock private lateinit var demoModeController: DemoModeController
 
     @JvmField @Rule
     val mockitoRule = MockitoJUnit.rule()
@@ -149,7 +154,7 @@
 
     @Before
     fun setUp() {
-        whenever<TextView>(view.findViewById(R.id.clock)).thenReturn(clock)
+        whenever<Clock>(view.findViewById(R.id.clock)).thenReturn(clock)
         whenever(clock.context).thenReturn(mockedContext)
 
         whenever<TextView>(view.findViewById(R.id.date)).thenReturn(date)
@@ -196,7 +201,8 @@
             dumpManager,
             featureFlags,
             qsCarrierGroupControllerBuilder,
-            combinedShadeHeadersConstraintManager
+            combinedShadeHeadersConstraintManager,
+            demoModeController
         )
         whenever(view.isAttachedToWindow).thenReturn(true)
         controller.init()
@@ -618,6 +624,23 @@
     }
 
     @Test
+    fun demoMode_attachDemoMode() {
+        val cb = argumentCaptor<DemoMode>()
+        verify(demoModeController).addCallback(cb.capture())
+        cb.value.onDemoModeStarted()
+        verify(clock).onDemoModeStarted()
+    }
+
+    @Test
+    fun demoMode_detachDemoMode() {
+        controller.simulateViewDetached()
+        val cb = argumentCaptor<DemoMode>()
+        verify(demoModeController).removeCallback(cb.capture())
+        cb.value.onDemoModeFinished()
+        verify(clock).onDemoModeFinished()
+    }
+
+    @Test
     fun animateOutOnStartCustomizing() {
         val animator = Mockito.mock(ViewPropertyAnimator::class.java, Answers.RETURNS_SELF)
         val duration = 1000L
diff --git a/packages/SystemUI/tests/src/com/android/systemui/shade/LargeScreenShadeHeaderControllerTest.kt b/packages/SystemUI/tests/src/com/android/systemui/shade/LargeScreenShadeHeaderControllerTest.kt
index 90ae693..0b85043 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/shade/LargeScreenShadeHeaderControllerTest.kt
+++ b/packages/SystemUI/tests/src/com/android/systemui/shade/LargeScreenShadeHeaderControllerTest.kt
@@ -13,6 +13,8 @@
 import com.android.systemui.animation.ShadeInterpolation
 import com.android.systemui.battery.BatteryMeterView
 import com.android.systemui.battery.BatteryMeterViewController
+import com.android.systemui.demomode.DemoMode
+import com.android.systemui.demomode.DemoModeController
 import com.android.systemui.dump.DumpManager
 import com.android.systemui.flags.FeatureFlags
 import com.android.systemui.flags.Flags
@@ -22,9 +24,11 @@
 import com.android.systemui.statusbar.phone.StatusBarContentInsetsProvider
 import com.android.systemui.statusbar.phone.StatusBarIconController
 import com.android.systemui.statusbar.phone.StatusIconContainer
+import com.android.systemui.statusbar.policy.Clock
 import com.android.systemui.statusbar.policy.FakeConfigurationController
 import com.android.systemui.statusbar.policy.VariableDateViewController
 import com.android.systemui.util.mockito.any
+import com.android.systemui.util.mockito.argumentCaptor
 import com.google.common.truth.Truth.assertThat
 import org.junit.After
 import org.junit.Before
@@ -52,7 +56,7 @@
     @Mock private lateinit var qsCarrierGroupController: QSCarrierGroupController
     @Mock private lateinit var qsCarrierGroupControllerBuilder: QSCarrierGroupController.Builder
     @Mock private lateinit var featureFlags: FeatureFlags
-    @Mock private lateinit var clock: TextView
+    @Mock private lateinit var clock: Clock
     @Mock private lateinit var date: TextView
     @Mock private lateinit var carrierGroup: QSCarrierGroup
     @Mock private lateinit var batteryMeterView: BatteryMeterView
@@ -66,6 +70,7 @@
         CombinedShadeHeadersConstraintManager
 
     @Mock private lateinit var mockedContext: Context
+    @Mock private lateinit var demoModeController: DemoModeController
 
     @JvmField @Rule val mockitoRule = MockitoJUnit.rule()
     var viewVisibility = View.GONE
@@ -76,7 +81,7 @@
 
     @Before
     fun setup() {
-        whenever<TextView>(view.findViewById(R.id.clock)).thenReturn(clock)
+        whenever<Clock>(view.findViewById(R.id.clock)).thenReturn(clock)
         whenever(clock.context).thenReturn(mockedContext)
         whenever<TextView>(view.findViewById(R.id.date)).thenReturn(date)
         whenever(date.context).thenReturn(mockedContext)
@@ -111,8 +116,9 @@
                 dumpManager,
                 featureFlags,
                 qsCarrierGroupControllerBuilder,
-                combinedShadeHeadersConstraintManager
-        )
+                combinedShadeHeadersConstraintManager,
+                demoModeController
+                )
         whenever(view.isAttachedToWindow).thenReturn(true)
         mLargeScreenShadeHeaderController.init()
         carrierIconSlots = listOf(
@@ -230,4 +236,21 @@
         verify(animator).setInterpolator(Interpolators.ALPHA_IN)
         verify(animator).start()
     }
+
+    @Test
+    fun demoMode_attachDemoMode() {
+        val cb = argumentCaptor<DemoMode>()
+        verify(demoModeController).addCallback(cb.capture())
+        cb.value.onDemoModeStarted()
+        verify(clock).onDemoModeStarted()
+    }
+
+    @Test
+    fun demoMode_detachDemoMode() {
+        mLargeScreenShadeHeaderController.simulateViewDetached()
+        val cb = argumentCaptor<DemoMode>()
+        verify(demoModeController).removeCallback(cb.capture())
+        cb.value.onDemoModeFinished()
+        verify(clock).onDemoModeFinished()
+    }
 }