diff --git a/cmds/statsd/src/atoms.proto b/cmds/statsd/src/atoms.proto
index d117f390705dd..2c07431ee38a8 100644
--- a/cmds/statsd/src/atoms.proto
+++ b/cmds/statsd/src/atoms.proto
@@ -91,7 +91,7 @@ message Atom {
         ActivityForegroundStateChanged activity_foreground_state_changed = 42;
         IsolatedUidChanged isolated_uid_changed = 43;
         PacketWakeupOccurred packet_wakeup_occurred = 44;
-        // 45 is available
+        WallClockTimeShifted wall_clock_time_shifted = 45;
         AnomalyDetected anomaly_detected = 46;
         AppBreadcrumbReported app_breadcrumb_reported = 47;
         AppStartOccurred app_start_occurred = 48;
@@ -1478,6 +1478,18 @@ message AppBreadcrumbReported {
     optional State state = 3;
 }
 
+/**
+ * Logs the wall-clock time when a significant wall-clock time shift occurs.
+ * For example, this could be due to the user manually changing the time.
+ *
+ * Logged from:
+ *   frameworks/base/services/core/java/com/android/server/AlarmManagerService.java
+ */
+message WallClockTimeShifted {
+    // New wall-clock time in milliseconds, according to System.currentTimeMillis().
+    optional int64 wall_clock_timestamp_millis = 1;
+}
+
 /**
  * Logs when statsd detects an anomaly.
  *
diff --git a/services/core/java/com/android/server/AlarmManagerService.java b/services/core/java/com/android/server/AlarmManagerService.java
index 499c03d05bf23..ad2f82c9b19ff 100644
--- a/services/core/java/com/android/server/AlarmManagerService.java
+++ b/services/core/java/com/android/server/AlarmManagerService.java
@@ -81,6 +81,7 @@ import android.util.Slog;
 import android.util.SparseArray;
 import android.util.SparseBooleanArray;
 import android.util.SparseLongArray;
+import android.util.StatsLog;
 import android.util.TimeUtils;
 import android.util.proto.ProtoOutputStream;
 
@@ -3637,6 +3638,8 @@ class AlarmManagerService extends SystemService {
                         if (DEBUG_BATCH) {
                             Slog.v(TAG, "Time changed notification from kernel; rebatching");
                         }
+                        // StatsLog requires currentTimeMillis(), which == nowRTC to within usecs.
+                        StatsLog.write(StatsLog.WALL_CLOCK_TIME_SHIFTED, nowRTC);
                         removeImpl(mTimeTickSender);
                         removeImpl(mDateChangeSender);
                         rebatchAllAlarms();