diff --git a/core/java/android/app/people/IPeopleManager.aidl b/core/java/android/app/people/IPeopleManager.aidl
index 61dac0d64422d..c547ef1e7e9b5 100644
--- a/core/java/android/app/people/IPeopleManager.aidl
+++ b/core/java/android/app/people/IPeopleManager.aidl
@@ -39,4 +39,10 @@ interface IPeopleManager {
 
     /** Removes all the recent conversations and uncaches their cached shortcuts. */
     void removeAllRecentConversations();
+
+    /**
+     * Returns the last interaction with the specified conversation. If the
+     * conversation can't be found or no interactions have been recorded, returns 0L.
+     */
+    long getLastInteraction(in String packageName, int userId, in String shortcutId);
 }
diff --git a/services/people/java/com/android/server/people/PeopleService.java b/services/people/java/com/android/server/people/PeopleService.java
index e3f576287c805..6e3bde3a41a4a 100644
--- a/services/people/java/com/android/server/people/PeopleService.java
+++ b/services/people/java/com/android/server/people/PeopleService.java
@@ -123,6 +123,12 @@ public class PeopleService extends SystemService {
             mDataManager.removeAllRecentConversations(
                     Binder.getCallingUserHandle().getIdentifier());
         }
+
+        @Override
+        public long getLastInteraction(String packageName, int userId, String shortcutId) {
+            enforceSystemOrRoot("get last interaction");
+            return mDataManager.getLastInteraction(packageName, userId, shortcutId);
+        }
     }
 
     @VisibleForTesting
diff --git a/services/people/java/com/android/server/people/data/DataManager.java b/services/people/java/com/android/server/people/data/DataManager.java
index 5e67e6c7cb41b..87f2c581ef8f3 100644
--- a/services/people/java/com/android/server/people/data/DataManager.java
+++ b/services/people/java/com/android/server/people/data/DataManager.java
@@ -275,6 +275,21 @@ public class DataManager {
         });
     }
 
+    /**
+     * Returns the last notification interaction with the specified conversation. If the
+     * conversation can't be found or no interactions have been recorded, returns 0L.
+     */
+    public long getLastInteraction(String packageName, int userId, String shortcutId) {
+        final PackageData packageData = getPackage(packageName, userId);
+        if (packageData != null) {
+            final ConversationInfo conversationInfo = packageData.getConversationInfo(shortcutId);
+            if (conversationInfo != null) {
+                return conversationInfo.getLastEventTimestamp();
+            }
+        }
+        return 0L;
+    }
+
     /** Reports the sharing related {@link AppTargetEvent} from App Prediction Manager. */
     public void reportShareTargetEvent(@NonNull AppTargetEvent event,
             @NonNull IntentFilter intentFilter) {
diff --git a/services/tests/servicestests/src/com/android/server/people/data/DataManagerTest.java b/services/tests/servicestests/src/com/android/server/people/data/DataManagerTest.java
index efba9da06746a..f37054d269b10 100644
--- a/services/tests/servicestests/src/com/android/server/people/data/DataManagerTest.java
+++ b/services/tests/servicestests/src/com/android/server/people/data/DataManagerTest.java
@@ -837,6 +837,30 @@ public final class DataManagerTest {
         assertTrue(result.get(0).hasActiveNotifications());
     }
 
+    @Test
+    public void testGetLastInteraction() {
+        mDataManager.onUserUnlocked(USER_ID_PRIMARY);
+
+        ShortcutInfo shortcut = buildShortcutInfo(TEST_PKG_NAME, USER_ID_PRIMARY, TEST_SHORTCUT_ID,
+                buildPerson());
+        mDataManager.addOrUpdateConversationInfo(shortcut);
+
+        NotificationListenerService listenerService =
+                mDataManager.getNotificationListenerServiceForTesting(USER_ID_PRIMARY);
+        listenerService.onNotificationPosted(mStatusBarNotification);
+
+        assertEquals(mStatusBarNotification.getPostTime(),
+                mDataManager.getLastInteraction(TEST_PKG_NAME, USER_ID_PRIMARY, TEST_SHORTCUT_ID));
+        assertEquals(0L,
+                mDataManager.getLastInteraction("not_test_pkg", USER_ID_PRIMARY, TEST_SHORTCUT_ID));
+        assertEquals(0L,
+                mDataManager.getLastInteraction(TEST_PKG_NAME, USER_ID_PRIMARY_MANAGED,
+                        TEST_SHORTCUT_ID));
+        assertEquals(0L,
+                mDataManager.getLastInteraction(TEST_PKG_NAME, USER_ID_SECONDARY,
+                        TEST_SHORTCUT_ID));
+    }
+
     @Test
     public void testNonCachedShortcutNotInRecentList() {
         mDataManager.onUserUnlocked(USER_ID_PRIMARY);