Use elapsed realtime instead of times based on wall clock, which can jump around and go backwards.

Test: statsd unit test passed

Change-Id: Ib541df99231e171b3be2a24f75632693e36da90e
diff --git a/cmds/statsd/src/StatsLogProcessor.cpp b/cmds/statsd/src/StatsLogProcessor.cpp
index 3a20b12..afb2c47 100644
--- a/cmds/statsd/src/StatsLogProcessor.cpp
+++ b/cmds/statsd/src/StatsLogProcessor.cpp
@@ -21,6 +21,7 @@
 #include <android-base/file.h>
 #include <dirent.h>
 #include "StatsLogProcessor.h"
+#include "stats_log_util.h"
 #include "android-base/stringprintf.h"
 #include "guardrail/StatsdStats.h"
 #include "metrics/CountMetricProducer.h"
@@ -59,8 +60,8 @@
 // for ConfigMetricsReport
 const int FIELD_ID_METRICS = 1;
 const int FIELD_ID_UID_MAP = 2;
-const int FIELD_ID_LAST_REPORT_NANOS = 3;
-const int FIELD_ID_CURRENT_REPORT_NANOS = 4;
+const int FIELD_ID_LAST_REPORT_ELAPSED_NANOS = 3;
+const int FIELD_ID_CURRENT_REPORT_ELAPSED_NANOS = 4;
 
 #define STATS_DATA_DIR "/data/misc/stats-data"
 
@@ -136,7 +137,7 @@
 void StatsLogProcessor::OnLogEvent(LogEvent* event) {
     std::lock_guard<std::mutex> lock(mMetricsMutex);
     StatsdStats::getInstance().noteAtomLogged(
-        event->GetTagId(), event->GetTimestampNs() / NS_PER_SEC);
+        event->GetTagId(), event->GetElapsedTimestampNs() / NS_PER_SEC);
 
     // Hard-coded logic to update the isolated uid's in the uid-map.
     // The field numbers need to be currently updated by hand with atoms.proto
@@ -148,10 +149,10 @@
         return;
     }
 
-    long curTime = time(nullptr);
-    if (curTime - mLastPullerCacheClearTimeSec > StatsdStats::kPullerCacheClearIntervalSec) {
-        mStatsPullerManager.ClearPullerCacheIfNecessary(curTime);
-        mLastPullerCacheClearTimeSec = curTime;
+    uint64_t curTimeSec = getElapsedRealtimeSec();
+    if (curTimeSec - mLastPullerCacheClearTimeSec > StatsdStats::kPullerCacheClearIntervalSec) {
+        mStatsPullerManager.ClearPullerCacheIfNecessary(curTimeSec);
+        mLastPullerCacheClearTimeSec = curTimeSec;
     }
 
     if (event->GetTagId() != android::util::ISOLATED_UID_CHANGED) {
@@ -162,7 +163,7 @@
     // pass the event to metrics managers.
     for (auto& pair : mMetricsManagers) {
         pair.second->onLogEvent(*event);
-        flushIfNecessaryLocked(event->GetTimestampNs(), pair.first, *(pair.second));
+        flushIfNecessaryLocked(event->GetElapsedTimestampNs(), pair.first, *(pair.second));
     }
 }
 
@@ -242,6 +243,7 @@
     long long reportsToken =
             proto.start(FIELD_TYPE_MESSAGE | FIELD_COUNT_REPEATED | FIELD_ID_REPORTS);
 
+    int64_t lastReportTimeNs = it->second->getLastReportTimeNs();
     // First, fill in ConfigMetricsReport using current data on memory, which
     // starts from filling in StatsLogReport's.
     it->second->onDumpReport(dumpTimeStampNs, &proto);
@@ -254,10 +256,10 @@
     proto.write(FIELD_TYPE_MESSAGE | FIELD_ID_UID_MAP, uidMapBuffer, uidMapSize);
 
     // Fill in the timestamps.
-    proto.write(FIELD_TYPE_INT64 | FIELD_ID_LAST_REPORT_NANOS,
-                (long long)it->second->getLastReportTimeNs());
-    proto.write(FIELD_TYPE_INT64 | FIELD_ID_CURRENT_REPORT_NANOS,
-                (long long)::android::elapsedRealtimeNano());
+    proto.write(FIELD_TYPE_INT64 | FIELD_ID_LAST_REPORT_ELAPSED_NANOS,
+                (long long)lastReportTimeNs);
+    proto.write(FIELD_TYPE_INT64 | FIELD_ID_CURRENT_REPORT_ELAPSED_NANOS,
+                (long long)dumpTimeStampNs);
 
     // End of ConfigMetricsReport (reports).
     proto.end(reportsToken);
@@ -340,8 +342,8 @@
         vector<uint8_t> data;
         onDumpReportLocked(key, time(nullptr) * NS_PER_SEC, &data);
         // TODO: Add a guardrail to prevent accumulation of file on disk.
-        string file_name = StringPrintf("%s/%ld_%d_%lld", STATS_DATA_DIR, time(nullptr),
-                                        key.GetUid(), (long long)key.GetId());
+        string file_name = StringPrintf("%s/%ld_%d_%lld", STATS_DATA_DIR,
+             (long)getWallClockSec(), key.GetUid(), (long long)key.GetId());
         StorageManager::writeFile(file_name.c_str(), &data[0], data.size());
     }
 }
diff --git a/cmds/statsd/src/StatsService.cpp b/cmds/statsd/src/StatsService.cpp
index ee38667..bb47653 100644
--- a/cmds/statsd/src/StatsService.cpp
+++ b/cmds/statsd/src/StatsService.cpp
@@ -18,6 +18,7 @@
 #include "Log.h"
 
 #include "StatsService.h"
+#include "stats_log_util.h"
 #include "android-base/stringprintf.h"
 #include "config/ConfigKey.h"
 #include "config/ConfigManager.h"
@@ -79,18 +80,20 @@
     mUidMap = new UidMap();
     StatsPuller::SetUidMap(mUidMap);
     mConfigManager = new ConfigManager();
-    mProcessor = new StatsLogProcessor(mUidMap, mAnomalyMonitor, time(nullptr), [this](const ConfigKey& key) {
-        sp<IStatsCompanionService> sc = getStatsCompanionService();
-        auto receiver = mConfigManager->GetConfigReceiver(key);
-        if (sc == nullptr) {
-            VLOG("Could not find StatsCompanionService");
-        } else if (receiver == nullptr) {
-            VLOG("Statscompanion could not find a broadcast receiver for %s",
-                 key.ToString().c_str());
-        } else {
-            sc->sendDataBroadcast(receiver);
+    mProcessor = new StatsLogProcessor(mUidMap, mAnomalyMonitor, getElapsedRealtimeSec(),
+        [this](const ConfigKey& key) {
+            sp<IStatsCompanionService> sc = getStatsCompanionService();
+            auto receiver = mConfigManager->GetConfigReceiver(key);
+            if (sc == nullptr) {
+                VLOG("Could not find StatsCompanionService");
+            } else if (receiver == nullptr) {
+                VLOG("Statscompanion could not find a broadcast receiver for %s",
+                     key.ToString().c_str());
+            } else {
+                sc->sendDataBroadcast(receiver);
+            }
         }
-    });
+    );
 
     mConfigManager->AddListener(mProcessor);
 
@@ -668,11 +671,7 @@
         return Status::fromExceptionCode(Status::EX_SECURITY,
                                          "Only system uid can call informAnomalyAlarmFired");
     }
-
-    // TODO: This may be a bug. time(nullptr) can be off (wrt AlarmManager's time) and cause us to
-    //       miss the alarm! Eventually we will switch to using elapsedRealTime everywhere,
-    //       which may hopefully fix the problem, so we'll leave this alone for now.
-    uint64_t currentTimeSec = time(nullptr);
+    uint64_t currentTimeSec = getElapsedRealtimeSec();
     std::unordered_set<sp<const AnomalyAlarm>, SpHash<AnomalyAlarm>> anomalySet =
             mAnomalyMonitor->popSoonerThan(static_cast<uint32_t>(currentTimeSec));
     if (anomalySet.size() > 0) {
diff --git a/cmds/statsd/src/external/CpuTimePerUidFreqPuller.cpp b/cmds/statsd/src/external/CpuTimePerUidFreqPuller.cpp
index d0d2f93..d1d9d37 100644
--- a/cmds/statsd/src/external/CpuTimePerUidFreqPuller.cpp
+++ b/cmds/statsd/src/external/CpuTimePerUidFreqPuller.cpp
@@ -25,6 +25,7 @@
 #include "guardrail/StatsdStats.h"
 #include "logd/LogEvent.h"
 #include "statslog.h"
+#include "stats_log_util.h"
 
 using std::make_shared;
 using std::shared_ptr;
@@ -62,7 +63,9 @@
         return false;
     }
 
-    uint64_t timestamp = time(nullptr) * NS_PER_SEC;
+    int64_t wallClockTimestampNs = getWallClockNs();
+    int64_t elapsedTimestampNs = getElapsedRealtimeNs();
+
     char buf[kLineBufferSize];
     // first line prints the format and frequencies
     fin.getline(buf, kLineBufferSize);
@@ -77,7 +80,8 @@
         int idx = 0;
         do {
             timeMs = std::stoull(pch);
-            auto ptr = make_shared<LogEvent>(android::util::CPU_TIME_PER_UID_FREQ, timestamp);
+            auto ptr = make_shared<LogEvent>(android::util::CPU_TIME_PER_UID_FREQ,
+                wallClockTimestampNs, elapsedTimestampNs);
             ptr->write(uid);
             ptr->write(idx);
             ptr->write(timeMs);
diff --git a/cmds/statsd/src/external/CpuTimePerUidPuller.cpp b/cmds/statsd/src/external/CpuTimePerUidPuller.cpp
index d9aeb46..568b8f0 100644
--- a/cmds/statsd/src/external/CpuTimePerUidPuller.cpp
+++ b/cmds/statsd/src/external/CpuTimePerUidPuller.cpp
@@ -24,6 +24,7 @@
 #include "guardrail/StatsdStats.h"
 #include "logd/LogEvent.h"
 #include "statslog.h"
+#include "stats_log_util.h"
 
 using std::make_shared;
 using std::shared_ptr;
@@ -57,7 +58,8 @@
         return false;
     }
 
-    uint64_t timestamp = time(nullptr) * NS_PER_SEC;
+    int64_t wallClockTimestampNs = getWallClockNs();
+    int64_t elapsedTimestampNs = getElapsedRealtimeNs();
     char buf[kLineBufferSize];
     char* pch;
     while (!fin.eof()) {
@@ -70,7 +72,8 @@
         pch = strtok(buf, " ");
         uint64_t sysTimeMs = std::stoull(pch);
 
-        auto ptr = make_shared<LogEvent>(android::util::CPU_TIME_PER_UID, timestamp);
+        auto ptr = make_shared<LogEvent>(android::util::CPU_TIME_PER_UID,
+            wallClockTimestampNs, elapsedTimestampNs);
         ptr->write(uid);
         ptr->write(userTimeMs);
         ptr->write(sysTimeMs);
diff --git a/cmds/statsd/src/external/KernelUidCpuActiveTimeReader.cpp b/cmds/statsd/src/external/KernelUidCpuActiveTimeReader.cpp
index 0e126e7..0b545cc 100644
--- a/cmds/statsd/src/external/KernelUidCpuActiveTimeReader.cpp
+++ b/cmds/statsd/src/external/KernelUidCpuActiveTimeReader.cpp
@@ -23,6 +23,7 @@
 #include "guardrail/StatsdStats.h"
 #include "logd/LogEvent.h"
 #include "statslog.h"
+#include "stats_log_util.h"
 
 using std::make_shared;
 using std::shared_ptr;
@@ -57,7 +58,9 @@
         return false;
     }
 
-    uint64_t timestamp = time(nullptr) * NS_PER_SEC;
+    int64_t wallClockTimestampNs = getWallClockNs();
+    int64_t elapsedTimestampNs = getElapsedRealtimeNs();
+
     char buf[kLineBufferSize];
     char* pch;
     while (!fin.eof()) {
@@ -70,7 +73,7 @@
         int idx = 0;
         do {
             timeMs = std::stoull(pch);
-            auto ptr = make_shared<LogEvent>(mTagId, timestamp);
+            auto ptr = make_shared<LogEvent>(mTagId, wallClockTimestampNs, elapsedTimestampNs);
             ptr->write(uid);
             ptr->write(idx);
             ptr->write(timeMs);
diff --git a/cmds/statsd/src/external/KernelUidCpuClusterTimeReader.cpp b/cmds/statsd/src/external/KernelUidCpuClusterTimeReader.cpp
index 7684ed4..cc80204 100644
--- a/cmds/statsd/src/external/KernelUidCpuClusterTimeReader.cpp
+++ b/cmds/statsd/src/external/KernelUidCpuClusterTimeReader.cpp
@@ -22,6 +22,7 @@
 #include "guardrail/StatsdStats.h"
 #include "logd/LogEvent.h"
 #include "statslog.h"
+#include "stats_log_util.h"
 
 using std::make_shared;
 using std::shared_ptr;
@@ -56,7 +57,8 @@
         return false;
     }
 
-    uint64_t timestamp = time(nullptr) * NS_PER_SEC;
+    int64_t wallClockTimestampNs = getWallClockNs();
+    int64_t elapsedTimestampNs = getElapsedRealtimeNs();
     char buf[kLineBufferSize];
     char* pch;
     while (!fin.eof()) {
@@ -69,7 +71,7 @@
         int idx = 0;
         do {
             timeMs = std::stoull(pch);
-            auto ptr = make_shared<LogEvent>(mTagId, timestamp);
+            auto ptr = make_shared<LogEvent>(mTagId, wallClockTimestampNs, elapsedTimestampNs);
             ptr->write(uid);
             ptr->write(idx);
             ptr->write(timeMs);
diff --git a/cmds/statsd/src/external/ResourceHealthManagerPuller.cpp b/cmds/statsd/src/external/ResourceHealthManagerPuller.cpp
index 72fb5ff..261cb43 100644
--- a/cmds/statsd/src/external/ResourceHealthManagerPuller.cpp
+++ b/cmds/statsd/src/external/ResourceHealthManagerPuller.cpp
@@ -25,6 +25,7 @@
 #include "ResourceHealthManagerPuller.h"
 #include "logd/LogEvent.h"
 #include "statslog.h"
+#include "stats_log_util.h"
 
 using android::hardware::hidl_vec;
 using android::hardware::health::V2_0::get_health_service;
@@ -61,7 +62,8 @@
         return false;
     }
 
-    uint64_t timestamp = time(nullptr) * NS_PER_SEC;
+    int64_t wallClockTimestampNs = getWallClockNs();
+    int64_t elapsedTimestampNs = getElapsedRealtimeNs();
 
     data->clear();
     bool result_success = true;
@@ -72,12 +74,14 @@
             return;
         }
         if (mTagId == android::util::REMAINING_BATTERY_CAPACITY) {
-            auto ptr = make_shared<LogEvent>(android::util::REMAINING_BATTERY_CAPACITY, timestamp);
+            auto ptr = make_shared<LogEvent>(android::util::REMAINING_BATTERY_CAPACITY,
+                wallClockTimestampNs, elapsedTimestampNs);
             ptr->write(v.legacy.batteryChargeCounter);
             ptr->init();
             data->push_back(ptr);
         } else if (mTagId == android::util::FULL_BATTERY_CAPACITY) {
-            auto ptr = make_shared<LogEvent>(android::util::FULL_BATTERY_CAPACITY, timestamp);
+            auto ptr = make_shared<LogEvent>(android::util::FULL_BATTERY_CAPACITY,
+                wallClockTimestampNs, elapsedTimestampNs);
             ptr->write(v.legacy.batteryFullCharge);
             ptr->init();
             data->push_back(ptr);
diff --git a/cmds/statsd/src/external/StatsCompanionServicePuller.cpp b/cmds/statsd/src/external/StatsCompanionServicePuller.cpp
index 8210c8d..bd859fd 100644
--- a/cmds/statsd/src/external/StatsCompanionServicePuller.cpp
+++ b/cmds/statsd/src/external/StatsCompanionServicePuller.cpp
@@ -22,6 +22,7 @@
 #include <private/android_filesystem_config.h>
 #include "StatsCompanionServicePuller.h"
 #include "StatsService.h"
+#include "stats_log_util.h"
 #include "guardrail/StatsdStats.h"
 
 using namespace android;
@@ -53,13 +54,13 @@
             return false;
         }
         data->clear();
-        int timestamp = time(nullptr);
+        int32_t timestampSec = getWallClockSec();
         for (const StatsLogEventWrapper& it : returned_value) {
             log_msg tmp;
             tmp.entry_v1.len = it.bytes.size();
             // Manually set the header size to 28 bytes to match the pushed log events.
             tmp.entry.hdr_size = kLogMsgHeaderSize;
-            tmp.entry_v1.sec = timestamp;
+            tmp.entry_v1.sec = timestampSec;
             // And set the received bytes starting after the 28 bytes reserved for header.
             std::copy(it.bytes.begin(), it.bytes.end(), tmp.buf + kLogMsgHeaderSize);
             data->push_back(make_shared<LogEvent>(tmp));
diff --git a/cmds/statsd/src/external/StatsPuller.cpp b/cmds/statsd/src/external/StatsPuller.cpp
index fc0ad7c..9513cc5 100644
--- a/cmds/statsd/src/external/StatsPuller.cpp
+++ b/cmds/statsd/src/external/StatsPuller.cpp
@@ -20,6 +20,7 @@
 #include "StatsPuller.h"
 #include "guardrail/StatsdStats.h"
 #include "puller_util.h"
+#include "stats_log_util.h"
 
 namespace android {
 namespace os {
@@ -44,7 +45,7 @@
 bool StatsPuller::Pull(std::vector<std::shared_ptr<LogEvent>>* data) {
     lock_guard<std::mutex> lock(mLock);
     StatsdStats::getInstance().notePull(mTagId);
-    long curTime = time(nullptr);
+    long curTime = getElapsedRealtimeSec();
     if (curTime - mLastPullTimeSec < mCoolDownSec) {
         (*data) = mCachedData;
         StatsdStats::getInstance().notePullFromCache(mTagId);
diff --git a/cmds/statsd/src/external/StatsPullerManagerImpl.cpp b/cmds/statsd/src/external/StatsPullerManagerImpl.cpp
index 4c676a7..08c59cf 100644
--- a/cmds/statsd/src/external/StatsPullerManagerImpl.cpp
+++ b/cmds/statsd/src/external/StatsPullerManagerImpl.cpp
@@ -33,6 +33,7 @@
 #include "SubsystemSleepStatePuller.h"
 #include "logd/LogEvent.h"
 #include "statslog.h"
+#include "stats_log_util.h"
 
 #include <iostream>
 
@@ -165,8 +166,9 @@
     if (roundedIntervalMs < mCurrentPullingInterval) {
         VLOG("Updating pulling interval %ld", intervalMs);
         mCurrentPullingInterval = roundedIntervalMs;
-        long currentTimeMs = time(nullptr) * 1000;
-        long nextAlarmTimeMs = currentTimeMs + mCurrentPullingInterval - (currentTimeMs - mTimeBaseSec * 1000) % mCurrentPullingInterval;
+        long currentTimeMs = getElapsedRealtimeMillis();
+        long nextAlarmTimeMs = currentTimeMs + mCurrentPullingInterval -
+            (currentTimeMs - mTimeBaseSec * 1000) % mCurrentPullingInterval;
         if (mStatsCompanionService != nullptr) {
             mStatsCompanionService->setPullingAlarms(nextAlarmTimeMs, mCurrentPullingInterval);
         } else {
@@ -195,7 +197,7 @@
 void StatsPullerManagerImpl::OnAlarmFired() {
     AutoMutex _l(mReceiversLock);
 
-    uint64_t currentTimeMs = time(nullptr) /60 * 60 * 1000;
+    uint64_t currentTimeMs = getElapsedRealtimeMillis();
 
     vector<pair<int, vector<ReceiverInfo*>>> needToPull =
             vector<pair<int, vector<ReceiverInfo*>>>();
diff --git a/cmds/statsd/src/external/SubsystemSleepStatePuller.cpp b/cmds/statsd/src/external/SubsystemSleepStatePuller.cpp
index 65a1df0e..4501b64 100644
--- a/cmds/statsd/src/external/SubsystemSleepStatePuller.cpp
+++ b/cmds/statsd/src/external/SubsystemSleepStatePuller.cpp
@@ -36,6 +36,7 @@
 #include "SubsystemSleepStatePuller.h"
 #include "logd/LogEvent.h"
 #include "statslog.h"
+#include "stats_log_util.h"
 
 using android::hardware::hidl_vec;
 using android::hardware::power::V1_0::IPower;
@@ -84,20 +85,22 @@
         return false;
     }
 
-    uint64_t timestamp = time(nullptr) * NS_PER_SEC;
+    int64_t wallClockTimestampNs = getWallClockNs();
+    int64_t elapsedTimestampNs = getElapsedRealtimeNs();
 
     data->clear();
 
     Return<void> ret;
         ret = gPowerHalV1_0->getPlatformLowPowerStats(
-                [&data, timestamp](hidl_vec<PowerStatePlatformSleepState> states, Status status) {
+                [&data, wallClockTimestampNs, elapsedTimestampNs](hidl_vec<PowerStatePlatformSleepState> states, Status status) {
                     if (status != Status::SUCCESS) return;
 
                     for (size_t i = 0; i < states.size(); i++) {
                         const PowerStatePlatformSleepState& state = states[i];
 
-                        auto statePtr = make_shared<LogEvent>(android::util::SUBSYSTEM_SLEEP_STATE,
-                                                              timestamp);
+                        auto statePtr = make_shared<LogEvent>(
+                            android::util::SUBSYSTEM_SLEEP_STATE,
+                            wallClockTimestampNs, elapsedTimestampNs);
                         statePtr->write(state.name);
                         statePtr->write("");
                         statePtr->write(state.totalTransitions);
@@ -109,8 +112,9 @@
                              (long long)state.totalTransitions,
                              state.supportedOnlyInSuspend ? 1 : 0);
                         for (auto voter : state.voters) {
-                            auto voterPtr = make_shared<LogEvent>(android::util::SUBSYSTEM_SLEEP_STATE,
-                                                                  timestamp);
+                            auto voterPtr = make_shared<LogEvent>(
+                                android::util::SUBSYSTEM_SLEEP_STATE,
+                                wallClockTimestampNs, elapsedTimestampNs);
                             voterPtr->write(state.name);
                             voterPtr->write(voter.name);
                             voterPtr->write(voter.totalNumberOfTimesVotedSinceBoot);
@@ -135,7 +139,7 @@
                 android::hardware::power::V1_1::IPower::castFrom(gPowerHalV1_0);
         if (gPowerHal_1_1 != nullptr) {
             ret = gPowerHal_1_1->getSubsystemLowPowerStats(
-                    [&data, timestamp](hidl_vec<PowerStateSubsystem> subsystems, Status status) {
+                    [&data, wallClockTimestampNs, elapsedTimestampNs](hidl_vec<PowerStateSubsystem> subsystems, Status status) {
                         if (status != Status::SUCCESS) return;
 
                         if (subsystems.size() > 0) {
@@ -145,7 +149,8 @@
                                     const PowerStateSubsystemSleepState& state =
                                             subsystem.states[j];
                                     auto subsystemStatePtr = make_shared<LogEvent>(
-                                        android::util::SUBSYSTEM_SLEEP_STATE, timestamp);
+                                        android::util::SUBSYSTEM_SLEEP_STATE,
+                                        wallClockTimestampNs, elapsedTimestampNs);
                                     subsystemStatePtr->write(subsystem.name);
                                     subsystemStatePtr->write(state.name);
                                     subsystemStatePtr->write(state.totalTransitions);
diff --git a/cmds/statsd/src/guardrail/StatsdStats.cpp b/cmds/statsd/src/guardrail/StatsdStats.cpp
index 06c5b00..e2e9426 100644
--- a/cmds/statsd/src/guardrail/StatsdStats.cpp
+++ b/cmds/statsd/src/guardrail/StatsdStats.cpp
@@ -80,7 +80,7 @@
 // TODO: add stats for pulled atoms.
 StatsdStats::StatsdStats() {
     mPushedAtomStats.resize(android::util::kMaxPushedAtomId + 1);
-    mStartTimeSec = time(nullptr);
+    mStartTimeSec = getWallClockSec();
 }
 
 StatsdStats& StatsdStats::getInstance() {
@@ -99,7 +99,7 @@
 void StatsdStats::noteConfigReceived(const ConfigKey& key, int metricsCount, int conditionsCount,
                                      int matchersCount, int alertsCount, bool isValid) {
     lock_guard<std::mutex> lock(mLock);
-    int32_t nowTimeSec = time(nullptr);
+    int32_t nowTimeSec = getWallClockSec();
 
     // If there is an existing config for the same key, icebox the old config.
     noteConfigRemovedInternalLocked(key);
@@ -125,7 +125,7 @@
 void StatsdStats::noteConfigRemovedInternalLocked(const ConfigKey& key) {
     auto it = mConfigStats.find(key);
     if (it != mConfigStats.end()) {
-        int32_t nowTimeSec = time(nullptr);
+        int32_t nowTimeSec = getWallClockSec();
         it->second.set_deletion_time_sec(nowTimeSec);
         // Add condition stats, metrics stats, matcher stats, alert stats
         addSubStatsToConfigLocked(key, it->second);
@@ -145,7 +145,7 @@
 }
 
 void StatsdStats::noteBroadcastSent(const ConfigKey& key) {
-    noteBroadcastSent(key, time(nullptr));
+    noteBroadcastSent(key, getWallClockSec());
 }
 
 void StatsdStats::noteBroadcastSent(const ConfigKey& key, int32_t timeSec) {
@@ -164,7 +164,7 @@
 }
 
 void StatsdStats::noteDataDropped(const ConfigKey& key) {
-    noteDataDropped(key, time(nullptr));
+    noteDataDropped(key, getWallClockSec());
 }
 
 void StatsdStats::noteDataDropped(const ConfigKey& key, int32_t timeSec) {
@@ -183,7 +183,7 @@
 }
 
 void StatsdStats::noteMetricsReportSent(const ConfigKey& key) {
-    noteMetricsReportSent(key, time(nullptr));
+    noteMetricsReportSent(key, getWallClockSec());
 }
 
 void StatsdStats::noteMetricsReportSent(const ConfigKey& key, int32_t timeSec) {
@@ -275,10 +275,6 @@
 void StatsdStats::noteAtomLogged(int atomId, int32_t timeSec) {
     lock_guard<std::mutex> lock(mLock);
 
-    if (timeSec < mStartTimeSec) {
-        return;
-    }
-
     if (atomId > android::util::kMaxPushedAtomId) {
         ALOGW("not interested in atom %d", atomId);
         return;
@@ -293,7 +289,7 @@
     if (mLoggerErrors.size() == kMaxLoggerErrors) {
         mLoggerErrors.pop_front();
     }
-    mLoggerErrors.push_back(std::make_pair(time(nullptr), error));
+    mLoggerErrors.push_back(std::make_pair(getWallClockSec(), error));
 }
 
 void StatsdStats::reset() {
@@ -303,7 +299,7 @@
 
 void StatsdStats::resetInternalLocked() {
     // Reset the historical data, but keep the active ConfigStats
-    mStartTimeSec = time(nullptr);
+    mStartTimeSec = getWallClockSec();
     mIceBox.clear();
     mConditionStats.clear();
     mMetricsStats.clear();
@@ -495,7 +491,7 @@
 
     ProtoOutputStream proto;
     proto.write(FIELD_TYPE_INT32 | FIELD_ID_BEGIN_TIME, mStartTimeSec);
-    proto.write(FIELD_TYPE_INT32 | FIELD_ID_END_TIME, (int32_t)time(nullptr));
+    proto.write(FIELD_TYPE_INT32 | FIELD_ID_END_TIME, (int32_t)getWallClockSec());
 
     for (const auto& configStats : mIceBox) {
         const int numBytes = configStats.ByteSize();
diff --git a/cmds/statsd/src/logd/LogEvent.cpp b/cmds/statsd/src/logd/LogEvent.cpp
index 45fb5da..7489d9b 100644
--- a/cmds/statsd/src/logd/LogEvent.cpp
+++ b/cmds/statsd/src/logd/LogEvent.cpp
@@ -33,7 +33,7 @@
 LogEvent::LogEvent(log_msg& msg) {
     mContext =
             create_android_log_parser(msg.msg() + sizeof(uint32_t), msg.len() - sizeof(uint32_t));
-    mTimestampNs = msg.entry_v1.sec * NS_PER_SEC + msg.entry_v1.nsec;
+    mLogdTimestampNs = msg.entry_v1.sec * NS_PER_SEC + msg.entry_v1.nsec;
     mLogUid = msg.entry_v4.uid;
     init(mContext);
     if (mContext) {
@@ -42,12 +42,24 @@
     }
 }
 
-LogEvent::LogEvent(int32_t tagId, uint64_t timestampNs) {
-    mTimestampNs = timestampNs;
+LogEvent::LogEvent(int32_t tagId, int64_t wallClockTimestampNs, int64_t elapsedTimestampNs) {
+    mLogdTimestampNs = wallClockTimestampNs;
     mTagId = tagId;
     mLogUid = 0;
     mContext = create_android_logger(1937006964); // the event tag shared by all stats logs
     if (mContext) {
+        android_log_write_int64(mContext, elapsedTimestampNs);
+        android_log_write_int32(mContext, tagId);
+    }
+}
+
+LogEvent::LogEvent(int32_t tagId, int64_t timestampNs) {
+    mLogdTimestampNs = timestampNs;
+    mTagId = tagId;
+    mLogUid = 0;
+    mContext = create_android_logger(1937006964); // the event tag shared by all stats logs
+    if (mContext) {
+        android_log_write_int64(mContext, timestampNs);
         android_log_write_int32(mContext, tagId);
     }
 }
@@ -176,8 +188,8 @@
         elem = android_log_read_next(context);
         switch ((int)elem.type) {
             case EVENT_TYPE_INT:
-                // elem at [0] is EVENT_TYPE_LIST, [1] is the tag id.
-                if (i == 1) {
+                // elem at [0] is EVENT_TYPE_LIST, [1] is the timestamp, [2] is tag id.
+                if (i == 2) {
                     mTagId = elem.data.int32;
                 } else {
                     if (depth < 0 || depth > 2) {
@@ -214,15 +226,18 @@
 
             } break;
             case EVENT_TYPE_LONG: {
-                if (depth < 0 || depth > 2) {
-                    ALOGE("Depth > 2. Not supported!");
-                    return;
+                if (i == 1) {
+                    mElapsedTimestampNs = elem.data.int64;
+                } else {
+                    if (depth < 0 || depth > 2) {
+                        ALOGE("Depth > 2. Not supported!");
+                        return;
+                    }
+                    mValues.push_back(
+                            FieldValue(Field(mTagId, pos, depth), Value((int64_t)elem.data.int64)));
+
+                    pos[depth]++;
                 }
-                mValues.push_back(
-                        FieldValue(Field(mTagId, pos, depth), Value((int64_t)elem.data.int64)));
-
-                pos[depth]++;
-
             } break;
             case EVENT_TYPE_LIST:
                 depth++;
@@ -370,7 +385,7 @@
 
 string LogEvent::ToString() const {
     ostringstream result;
-    result << "{ " << mTimestampNs << " (" << mTagId << ")";
+    result << "{ " << mLogdTimestampNs << " "  << mElapsedTimestampNs << " (" << mTagId << ")";
     for (const auto& value : mValues) {
         result << StringPrintf("%#x", value.mField.getField());
         result << "->";
diff --git a/cmds/statsd/src/logd/LogEvent.h b/cmds/statsd/src/logd/LogEvent.h
index 0895daa..b3084d5 100644
--- a/cmds/statsd/src/logd/LogEvent.h
+++ b/cmds/statsd/src/logd/LogEvent.h
@@ -47,14 +47,18 @@
     /**
      * Constructs a LogEvent with synthetic data for testing. Must call init() before reading.
      */
-    explicit LogEvent(int32_t tagId, uint64_t timestampNs);
+    explicit LogEvent(int32_t tagId, int64_t wallClockTimestampNs, int64_t elapsedTimestampNs);
+
+    // For testing. The timestamp is used as both elapsed real time and logd timestamp.
+    explicit LogEvent(int32_t tagId, int64_t timestampNs);
 
     ~LogEvent();
 
     /**
      * Get the timestamp associated with this event.
      */
-    inline uint64_t GetTimestampNs() const { return mTimestampNs; }
+    inline int64_t GetLogdTimestampNs() const { return mLogdTimestampNs; }
+    inline int64_t GetElapsedTimestampNs() const { return mElapsedTimestampNs; }
 
     /**
      * Get the tag for this event.
@@ -107,9 +111,18 @@
     void init();
 
     /**
-     * Set timestamp if the original timestamp is missing.
+     * Set elapsed timestamp if the original timestamp is missing.
      */
-    void setTimestampNs(uint64_t timestampNs) {mTimestampNs = timestampNs;}
+    void setElapsedTimestampNs(int64_t timestampNs) {
+        mElapsedTimestampNs = timestampNs;
+    }
+
+    /**
+     * Set the timestamp if the original logd timestamp is missing.
+     */
+    void setLogdWallClockTimestampNs(int64_t timestampNs) {
+        mLogdTimestampNs = timestampNs;
+    }
 
     inline int size() const {
         return mValues.size();
@@ -144,7 +157,11 @@
     // When the log event is created from log msg, this field is never initiated.
     android_log_context mContext = NULL;
 
-    uint64_t mTimestampNs;
+    // The timestamp set by the logd.
+    int64_t mLogdTimestampNs;
+
+    // The elapsed timestamp set by statsd log writer.
+    int64_t mElapsedTimestampNs;
 
     int mTagId;
 
diff --git a/cmds/statsd/src/metrics/CountMetricProducer.cpp b/cmds/statsd/src/metrics/CountMetricProducer.cpp
index bd2674b..178db1a 100644
--- a/cmds/statsd/src/metrics/CountMetricProducer.cpp
+++ b/cmds/statsd/src/metrics/CountMetricProducer.cpp
@@ -52,8 +52,8 @@
 const int FIELD_ID_DIMENSION_IN_CONDITION = 2;
 const int FIELD_ID_BUCKET_INFO = 3;
 // for CountBucketInfo
-const int FIELD_ID_START_BUCKET_NANOS = 1;
-const int FIELD_ID_END_BUCKET_NANOS = 2;
+const int FIELD_ID_START_BUCKET_ELAPSED_NANOS = 1;
+const int FIELD_ID_END_BUCKET_ELAPSED_NANOS = 2;
 const int FIELD_ID_COUNT = 3;
 
 CountMetricProducer::CountMetricProducer(const ConfigKey& key, const CountMetric& metric,
@@ -107,7 +107,6 @@
     if (mPastBuckets.empty()) {
         return;
     }
-
     protoOutput->write(FIELD_TYPE_INT64 | FIELD_ID_ID, (long long)mMetricId);
     long long protoToken = protoOutput->start(FIELD_TYPE_MESSAGE | FIELD_ID_COUNT_METRICS);
 
@@ -132,12 +131,13 @@
         }
 
         // Then fill bucket_info (CountBucketInfo).
+
         for (const auto& bucket : counter.second) {
             long long bucketInfoToken = protoOutput->start(
                     FIELD_TYPE_MESSAGE | FIELD_COUNT_REPEATED | FIELD_ID_BUCKET_INFO);
-            protoOutput->write(FIELD_TYPE_INT64 | FIELD_ID_START_BUCKET_NANOS,
+            protoOutput->write(FIELD_TYPE_INT64 | FIELD_ID_START_BUCKET_ELAPSED_NANOS,
                                (long long)bucket.mBucketStartNs);
-            protoOutput->write(FIELD_TYPE_INT64 | FIELD_ID_END_BUCKET_NANOS,
+            protoOutput->write(FIELD_TYPE_INT64 | FIELD_ID_END_BUCKET_ELAPSED_NANOS,
                                (long long)bucket.mBucketEndNs);
             protoOutput->write(FIELD_TYPE_INT64 | FIELD_ID_COUNT, (long long)bucket.mCount);
             protoOutput->end(bucketInfoToken);
@@ -184,7 +184,7 @@
         const size_t matcherIndex, const MetricDimensionKey& eventKey,
         const ConditionKey& conditionKey, bool condition,
         const LogEvent& event) {
-    uint64_t eventTimeNs = event.GetTimestampNs();
+    uint64_t eventTimeNs = event.GetElapsedTimestampNs();
     flushIfNeededLocked(eventTimeNs);
 
     if (condition == false) {
diff --git a/cmds/statsd/src/metrics/DurationMetricProducer.cpp b/cmds/statsd/src/metrics/DurationMetricProducer.cpp
index 6b321e1..af22578c 100644
--- a/cmds/statsd/src/metrics/DurationMetricProducer.cpp
+++ b/cmds/statsd/src/metrics/DurationMetricProducer.cpp
@@ -51,8 +51,8 @@
 const int FIELD_ID_DIMENSION_IN_CONDITION = 2;
 const int FIELD_ID_BUCKET_INFO = 3;
 // for DurationBucketInfo
-const int FIELD_ID_START_BUCKET_NANOS = 1;
-const int FIELD_ID_END_BUCKET_NANOS = 2;
+const int FIELD_ID_START_BUCKET_ELAPSED_NANOS = 1;
+const int FIELD_ID_END_BUCKET_ELAPSED_NANOS = 2;
 const int FIELD_ID_DURATION = 3;
 
 DurationMetricProducer::DurationMetricProducer(const ConfigKey& key, const DurationMetric& metric,
@@ -221,9 +221,9 @@
         for (const auto& bucket : pair.second) {
             long long bucketInfoToken = protoOutput->start(
                     FIELD_TYPE_MESSAGE | FIELD_COUNT_REPEATED | FIELD_ID_BUCKET_INFO);
-            protoOutput->write(FIELD_TYPE_INT64 | FIELD_ID_START_BUCKET_NANOS,
+            protoOutput->write(FIELD_TYPE_INT64 | FIELD_ID_START_BUCKET_ELAPSED_NANOS,
                                (long long)bucket.mBucketStartNs);
-            protoOutput->write(FIELD_TYPE_INT64 | FIELD_ID_END_BUCKET_NANOS,
+            protoOutput->write(FIELD_TYPE_INT64 | FIELD_ID_END_BUCKET_ELAPSED_NANOS,
                                (long long)bucket.mBucketEndNs);
             protoOutput->write(FIELD_TYPE_INT64 | FIELD_ID_DURATION, (long long)bucket.mDuration);
             protoOutput->end(bucketInfoToken);
@@ -310,11 +310,11 @@
         const size_t matcherIndex, const MetricDimensionKey& eventKey,
         const ConditionKey& conditionKeys, bool condition,
         const LogEvent& event) {
-    flushIfNeededLocked(event.GetTimestampNs());
+    flushIfNeededLocked(event.GetElapsedTimestampNs());
 
     if (matcherIndex == mStopAllIndex) {
         for (auto& pair : mCurrentSlicedDurationTrackerMap) {
-            pair.second->noteStopAll(event.GetTimestampNs());
+            pair.second->noteStopAll(event.GetElapsedTimestampNs());
         }
         return;
     }
@@ -333,16 +333,16 @@
     if (values.empty()) {
         if (matcherIndex == mStartIndex) {
             it->second->noteStart(DEFAULT_DIMENSION_KEY, condition,
-                                  event.GetTimestampNs(), conditionKeys);
+                                  event.GetElapsedTimestampNs(), conditionKeys);
         } else if (matcherIndex == mStopIndex) {
-            it->second->noteStop(DEFAULT_DIMENSION_KEY, event.GetTimestampNs(), false);
+            it->second->noteStop(DEFAULT_DIMENSION_KEY, event.GetElapsedTimestampNs(), false);
         }
     } else {
         for (const auto& value : values) {
             if (matcherIndex == mStartIndex) {
-                it->second->noteStart(value, condition, event.GetTimestampNs(), conditionKeys);
+                it->second->noteStart(value, condition, event.GetElapsedTimestampNs(), conditionKeys);
             } else if (matcherIndex == mStopIndex) {
-                it->second->noteStop(value, event.GetTimestampNs(), false);
+                it->second->noteStop(value, event.GetElapsedTimestampNs(), false);
             }
         }
     }
diff --git a/cmds/statsd/src/metrics/EventMetricProducer.cpp b/cmds/statsd/src/metrics/EventMetricProducer.cpp
index ed7e44d..2585aa3 100644
--- a/cmds/statsd/src/metrics/EventMetricProducer.cpp
+++ b/cmds/statsd/src/metrics/EventMetricProducer.cpp
@@ -19,6 +19,7 @@
 
 #include "EventMetricProducer.h"
 #include "stats_util.h"
+#include "stats_log_util.h"
 
 #include <limits.h>
 #include <stdlib.h>
@@ -46,8 +47,9 @@
 // for EventMetricDataWrapper
 const int FIELD_ID_DATA = 1;
 // for EventMetricData
-const int FIELD_ID_TIMESTAMP_NANOS = 1;
+const int FIELD_ID_ELAPSED_TIMESTAMP_NANOS = 1;
 const int FIELD_ID_ATOMS = 2;
+const int FIELD_ID_WALL_CLOCK_TIMESTAMP_NANOS = 3;
 
 EventMetricProducer::EventMetricProducer(const ConfigKey& key, const EventMetric& metric,
                                          const int conditionIndex,
@@ -127,9 +129,12 @@
 
     long long wrapperToken =
             mProto->start(FIELD_TYPE_MESSAGE | FIELD_COUNT_REPEATED | FIELD_ID_DATA);
-    mProto->write(FIELD_TYPE_INT64 | FIELD_ID_TIMESTAMP_NANOS, (long long)event.GetTimestampNs());
+    mProto->write(FIELD_TYPE_INT64 | FIELD_ID_ELAPSED_TIMESTAMP_NANOS,
+        (long long)event.GetElapsedTimestampNs());
     long long eventToken = mProto->start(FIELD_TYPE_MESSAGE | FIELD_ID_ATOMS);
     event.ToProto(*mProto);
+    mProto->write(FIELD_TYPE_INT64 | FIELD_ID_WALL_CLOCK_TIMESTAMP_NANOS,
+        (long long)getWallClockNs());
     mProto->end(eventToken);
     mProto->end(wrapperToken);
 }
diff --git a/cmds/statsd/src/metrics/GaugeMetricProducer.cpp b/cmds/statsd/src/metrics/GaugeMetricProducer.cpp
index da0cafe..af3b4c5 100644
--- a/cmds/statsd/src/metrics/GaugeMetricProducer.cpp
+++ b/cmds/statsd/src/metrics/GaugeMetricProducer.cpp
@@ -52,10 +52,10 @@
 const int FIELD_ID_DIMENSION_IN_CONDITION = 2;
 const int FIELD_ID_BUCKET_INFO = 3;
 // for GaugeBucketInfo
-const int FIELD_ID_START_BUCKET_NANOS = 1;
-const int FIELD_ID_END_BUCKET_NANOS = 2;
+const int FIELD_ID_START_BUCKET_ELAPSED_NANOS = 1;
+const int FIELD_ID_END_BUCKET_ELAPSED_NANOS = 2;
 const int FIELD_ID_ATOM = 3;
-const int FIELD_ID_TIMESTAMP = 4;
+const int FIELD_ID_ELAPSED_ATOM_TIMESTAMP = 4;
 
 GaugeMetricProducer::GaugeMetricProducer(const ConfigKey& key, const GaugeMetric& metric,
                                          const int conditionIndex,
@@ -161,9 +161,9 @@
         for (const auto& bucket : pair.second) {
             long long bucketInfoToken = protoOutput->start(
                     FIELD_TYPE_MESSAGE | FIELD_COUNT_REPEATED | FIELD_ID_BUCKET_INFO);
-            protoOutput->write(FIELD_TYPE_INT64 | FIELD_ID_START_BUCKET_NANOS,
+            protoOutput->write(FIELD_TYPE_INT64 | FIELD_ID_START_BUCKET_ELAPSED_NANOS,
                                (long long)bucket.mBucketStartNs);
-            protoOutput->write(FIELD_TYPE_INT64 | FIELD_ID_END_BUCKET_NANOS,
+            protoOutput->write(FIELD_TYPE_INT64 | FIELD_ID_END_BUCKET_ELAPSED_NANOS,
                                (long long)bucket.mBucketEndNs);
 
             if (!bucket.mGaugeAtoms.empty()) {
@@ -175,8 +175,9 @@
                 protoOutput->end(atomsToken);
 
                 for (const auto& atom : bucket.mGaugeAtoms) {
-                    protoOutput->write(FIELD_TYPE_INT64 | FIELD_COUNT_REPEATED | FIELD_ID_TIMESTAMP,
-                                       (long long)atom.mTimestamps);
+                    protoOutput->write(
+                        FIELD_TYPE_INT64 | FIELD_COUNT_REPEATED | FIELD_ID_ELAPSED_ATOM_TIMESTAMP,
+                        (long long)atom.mTimestamps);
                 }
             }
             protoOutput->end(bucketInfoToken);
@@ -293,7 +294,7 @@
     if (condition == false) {
         return;
     }
-    uint64_t eventTimeNs = event.GetTimestampNs();
+    uint64_t eventTimeNs = event.GetElapsedTimestampNs();
     mTagId = event.GetTagId();
     if (eventTimeNs < mCurrentBucketStartTimeNs) {
         VLOG("Skip event due to late arrival: %lld vs %lld", (long long)eventTimeNs,
diff --git a/cmds/statsd/src/metrics/MetricProducer.cpp b/cmds/statsd/src/metrics/MetricProducer.cpp
index beb9015..f3307dc 100644
--- a/cmds/statsd/src/metrics/MetricProducer.cpp
+++ b/cmds/statsd/src/metrics/MetricProducer.cpp
@@ -25,7 +25,7 @@
 using std::map;
 
 void MetricProducer::onMatchedLogEventLocked(const size_t matcherIndex, const LogEvent& event) {
-    uint64_t eventTimeNs = event.GetTimestampNs();
+    uint64_t eventTimeNs = event.GetElapsedTimestampNs();
     // this is old event, maybe statsd restarted?
     if (eventTimeNs < mStartTimeNs) {
         return;
diff --git a/cmds/statsd/src/metrics/MetricsManager.cpp b/cmds/statsd/src/metrics/MetricsManager.cpp
index dd6735b..ae48c52 100644
--- a/cmds/statsd/src/metrics/MetricsManager.cpp
+++ b/cmds/statsd/src/metrics/MetricsManager.cpp
@@ -26,6 +26,7 @@
 #include "matchers/SimpleLogMatchingTracker.h"
 #include "metrics_manager_util.h"
 #include "stats_util.h"
+#include "stats_log_util.h"
 
 #include <log/logprint.h>
 #include <private/android_filesystem_config.h>
@@ -49,9 +50,10 @@
 
 MetricsManager::MetricsManager(const ConfigKey& key, const StatsdConfig& config,
                                const long timeBaseSec, sp<UidMap> uidMap)
-    : mConfigKey(key), mUidMap(uidMap), mLastReportTimeNs(0) {
+    : mConfigKey(key), mUidMap(uidMap), mLastReportTimeNs(timeBaseSec * NS_PER_SEC) {
     mConfigValid =
-            initStatsdConfig(key, config, *uidMap, timeBaseSec, mTagIds, mAllAtomMatchers, mAllConditionTrackers,
+            initStatsdConfig(key, config, *uidMap, timeBaseSec, mTagIds, mAllAtomMatchers,
+                             mAllConditionTrackers,
                              mAllMetricProducers, mAllAnomalyTrackers, mConditionToMetricMap,
                              mTrackerToMetricMap, mTrackerToConditionMap, mNoReportMetricIds);
 
@@ -176,7 +178,7 @@
             protoOutput->end(token);
         }
     }
-    mLastReportTimeNs = ::android::elapsedRealtimeNano();
+    mLastReportTimeNs = dumpTimeStampNs;
     VLOG("=========================Metric Reports End==========================");
 }
 
@@ -230,7 +232,7 @@
     }
 
     int tagId = event.GetTagId();
-    uint64_t eventTime = event.GetTimestampNs();
+    uint64_t eventTime = event.GetElapsedTimestampNs();
     if (mTagIds.find(tagId) == mTagIds.end()) {
         // not interesting...
         return;
diff --git a/cmds/statsd/src/metrics/ValueMetricProducer.cpp b/cmds/statsd/src/metrics/ValueMetricProducer.cpp
index 45b4ac0..cbca884 100644
--- a/cmds/statsd/src/metrics/ValueMetricProducer.cpp
+++ b/cmds/statsd/src/metrics/ValueMetricProducer.cpp
@@ -219,19 +219,19 @@
         }
         // For scheduled pulled data, the effective event time is snap to the nearest
         // bucket boundary to make bucket finalize.
-        uint64_t realEventTime = allData.at(0)->GetTimestampNs();
+        uint64_t realEventTime = allData.at(0)->GetElapsedTimestampNs();
         uint64_t eventTime = mStartTimeNs +
-            ((realEventTime - mStartTimeNs)/mBucketSizeNs) * mBucketSizeNs;
+            ((realEventTime - mStartTimeNs) / mBucketSizeNs) * mBucketSizeNs;
 
         mCondition = false;
         for (const auto& data : allData) {
-            data->setTimestampNs(eventTime-1);
+            data->setElapsedTimestampNs(eventTime - 1);
             onMatchedLogEventLocked(0, *data);
         }
 
         mCondition = true;
         for (const auto& data : allData) {
-            data->setTimestampNs(eventTime);
+            data->setElapsedTimestampNs(eventTime);
             onMatchedLogEventLocked(0, *data);
         }
     }
@@ -261,7 +261,7 @@
         const size_t matcherIndex, const MetricDimensionKey& eventKey,
         const ConditionKey& conditionKey, bool condition,
         const LogEvent& event) {
-    uint64_t eventTimeNs = event.GetTimestampNs();
+    uint64_t eventTimeNs = event.GetElapsedTimestampNs();
     if (eventTimeNs < mCurrentBucketStartTimeNs) {
         VLOG("Skip event due to late arrival: %lld vs %lld", (long long)eventTimeNs,
              (long long)mCurrentBucketStartTimeNs);
diff --git a/cmds/statsd/src/metrics/ValueMetricProducer.h b/cmds/statsd/src/metrics/ValueMetricProducer.h
index 6701a46..b518f2f 100644
--- a/cmds/statsd/src/metrics/ValueMetricProducer.h
+++ b/cmds/statsd/src/metrics/ValueMetricProducer.h
@@ -62,7 +62,7 @@
             // Pretend the pulled data occurs right before the app upgrade event.
             mCondition = false;
             for (const auto& data : allData) {
-                data->setTimestampNs(eventTimeNs - 1);
+                data->setElapsedTimestampNs(eventTimeNs - 1);
                 onMatchedLogEventLocked(0, *data);
             }
 
@@ -71,7 +71,7 @@
 
             mCondition = true;
             for (const auto& data : allData) {
-                data->setTimestampNs(eventTimeNs);
+                data->setElapsedTimestampNs(eventTimeNs);
                 onMatchedLogEventLocked(0, *data);
             }
         } else {  // For pushed value metric, we simply flush and reset the current bucket start.
diff --git a/cmds/statsd/src/packages/UidMap.cpp b/cmds/statsd/src/packages/UidMap.cpp
index 691423e..e322ca4 100644
--- a/cmds/statsd/src/packages/UidMap.cpp
+++ b/cmds/statsd/src/packages/UidMap.cpp
@@ -16,6 +16,7 @@
 #define DEBUG true  // STOPSHIP if true
 #include "Log.h"
 
+#include "stats_log_util.h"
 #include "guardrail/StatsdStats.h"
 #include "packages/UidMap.h"
 
@@ -82,7 +83,7 @@
 
 void UidMap::updateMap(const vector<int32_t>& uid, const vector<int64_t>& versionCode,
                        const vector<String16>& packageName) {
-    updateMap(time(nullptr) * NS_PER_SEC, uid, versionCode, packageName);
+    updateMap(getElapsedRealtimeNs(), uid, versionCode, packageName);
 }
 
 void UidMap::updateMap(const int64_t& timestamp, const vector<int32_t>& uid,
@@ -98,7 +99,7 @@
         }
 
         auto snapshot = mOutput.add_snapshots();
-        snapshot->set_timestamp_nanos(timestamp);
+        snapshot->set_elapsed_timestamp_nanos(timestamp);
         for (size_t j = 0; j < uid.size(); j++) {
             auto t = snapshot->add_package_info();
             t->set_name(string(String8(packageName[j]).string()));
@@ -125,7 +126,7 @@
 }
 
 void UidMap::updateApp(const String16& app_16, const int32_t& uid, const int64_t& versionCode) {
-    updateApp(time(nullptr) * NS_PER_SEC, app_16, uid, versionCode);
+    updateApp(getElapsedRealtimeNs(), app_16, uid, versionCode);
 }
 
 void UidMap::updateApp(const int64_t& timestamp, const String16& app_16, const int32_t& uid,
@@ -137,7 +138,7 @@
 
         auto log = mOutput.add_changes();
         log->set_deletion(false);
-        log->set_timestamp_nanos(timestamp);
+        log->set_elapsed_timestamp_nanos(timestamp);
         log->set_app(appName);
         log->set_uid(uid);
         log->set_version(versionCode);
@@ -194,7 +195,7 @@
 }
 
 void UidMap::removeApp(const String16& app_16, const int32_t& uid) {
-    removeApp(time(nullptr) * NS_PER_SEC, app_16, uid);
+    removeApp(getElapsedRealtimeNs(), app_16, uid);
 }
 
 void UidMap::getListenerListCopyLocked(vector<wp<PackageInfoListener>>* output) {
@@ -218,7 +219,7 @@
 
         auto log = mOutput.add_changes();
         log->set_deletion(true);
-        log->set_timestamp_nanos(timestamp);
+        log->set_elapsed_timestamp_nanos(timestamp);
         log->set_app(app);
         log->set_uid(uid);
         mBytesUsed += log->ByteSize();
@@ -305,7 +306,7 @@
 }
 
 UidMapping UidMap::getOutput(const ConfigKey& key) {
-    return getOutput(time(nullptr) * NS_PER_SEC, key);
+    return getOutput(getElapsedRealtimeNs(), key);
 }
 
 UidMapping UidMap::getOutput(const int64_t& timestamp, const ConfigKey& key) {
@@ -321,7 +322,7 @@
         auto snapshots = mOutput.mutable_snapshots();
         auto it_snapshots = snapshots->cbegin();
         while (it_snapshots != snapshots->cend()) {
-            if (it_snapshots->timestamp_nanos() < cutoff_nanos) {
+            if (it_snapshots->elapsed_timestamp_nanos() < cutoff_nanos) {
                 // it_snapshots points to the following element after erasing.
                 it_snapshots = snapshots->erase(it_snapshots);
             } else {
@@ -331,7 +332,7 @@
         auto deltas = mOutput.mutable_changes();
         auto it_deltas = deltas->cbegin();
         while (it_deltas != deltas->cend()) {
-            if (it_deltas->timestamp_nanos() < cutoff_nanos) {
+            if (it_deltas->elapsed_timestamp_nanos() < cutoff_nanos) {
                 // it_snapshots points to the following element after erasing.
                 it_deltas = deltas->erase(it_deltas);
             } else {
@@ -343,7 +344,7 @@
             // Produce another snapshot. This results in extra data being uploaded but helps
             // ensure we can re-construct the UID->app name, versionCode mapping in server.
             auto snapshot = mOutput.add_snapshots();
-            snapshot->set_timestamp_nanos(timestamp);
+            snapshot->set_elapsed_timestamp_nanos(timestamp);
             for (auto it : mMap) {
                 auto t = snapshot->add_package_info();
                 t->set_name(it.second.packageName);
diff --git a/cmds/statsd/src/stats_log.proto b/cmds/statsd/src/stats_log.proto
index b56cffb..b427485 100644
--- a/cmds/statsd/src/stats_log.proto
+++ b/cmds/statsd/src/stats_log.proto
@@ -42,15 +42,17 @@
 }
 
 message EventMetricData {
-  optional int64 timestamp_nanos = 1;
+  optional int64 elapsed_timestamp_nanos = 1;
 
   optional Atom atom = 2;
+
+  optional int64 wall_clock_timestamp_sec = 3;
 }
 
 message CountBucketInfo {
-  optional int64 start_bucket_nanos = 1;
+  optional int64 start_bucket_elapsed_nanos = 1;
 
-  optional int64 end_bucket_nanos = 2;
+  optional int64 end_bucket_elapsed_nanos = 2;
 
   optional int64 count = 3;
 }
@@ -64,9 +66,9 @@
 }
 
 message DurationBucketInfo {
-  optional int64 start_bucket_nanos = 1;
+  optional int64 start_bucket_elapsed_nanos = 1;
 
-  optional int64 end_bucket_nanos = 2;
+  optional int64 end_bucket_elapsed_nanos = 2;
 
   optional int64 duration_nanos = 3;
 }
@@ -80,9 +82,9 @@
 }
 
 message ValueBucketInfo {
-  optional int64 start_bucket_nanos = 1;
+  optional int64 start_bucket_elapsed_nanos = 1;
 
-  optional int64 end_bucket_nanos = 2;
+  optional int64 end_bucket_elapsed_nanos = 2;
 
   optional int64 value = 3;
 }
@@ -102,7 +104,7 @@
 
   repeated Atom atom = 3;
 
-  repeated int64 timestamp_nanos = 4;
+  repeated int64 elapsed_timestamp_nanos = 4;
 }
 
 message GaugeMetricData {
@@ -122,7 +124,7 @@
 
       optional int32 uid = 3;
     }
-    optional int64 timestamp_nanos = 1;
+    optional int64 elapsed_timestamp_nanos = 1;
 
     repeated PackageInfo package_info = 2;
   }
@@ -131,7 +133,7 @@
   message Change {
     optional bool deletion = 1;
 
-    optional int64 timestamp_nanos = 2;
+    optional int64 elapsed_timestamp_nanos = 2;
     optional string app = 3;
     optional int32 uid = 4;
 
@@ -176,9 +178,9 @@
 
   optional UidMapping uid_map = 2;
 
-  optional int64 last_report_nanos = 3;
+  optional int64 last_report_elapsed_nanos = 3;
 
-  optional int64 current_report_nanos = 4;
+  optional int64 current_report_elapsed_nanos = 4;
 }
 
 message ConfigMetricsReportList {
diff --git a/cmds/statsd/src/stats_log_util.cpp b/cmds/statsd/src/stats_log_util.cpp
index 86c258b..e735770 100644
--- a/cmds/statsd/src/stats_log_util.cpp
+++ b/cmds/statsd/src/stats_log_util.cpp
@@ -20,6 +20,8 @@
 #include <utils/Log.h>
 #include <set>
 #include <stack>
+#include <utils/Log.h>
+#include <utils/SystemClock.h>
 
 using android::util::FIELD_COUNT_REPEATED;
 using android::util::FIELD_TYPE_BOOL;
@@ -263,6 +265,30 @@
     protoOutput->end(token);
 }
 
+int64_t getElapsedRealtimeNs() {
+    return ::android::elapsedRealtimeNano();
+}
+
+int64_t getElapsedRealtimeSec() {
+    return ::android::elapsedRealtimeNano() / NS_PER_SEC;
+}
+
+int64_t getElapsedRealtimeMillis() {
+    return ::android::elapsedRealtime();
+}
+
+int64_t getWallClockNs() {
+    return time(nullptr) * NS_PER_SEC;
+}
+
+int64_t getWallClockSec() {
+    return time(nullptr);
+}
+
+int64_t getWallClockMillis() {
+    return time(nullptr) * MS_PER_SEC;
+}
+
 }  // namespace statsd
 }  // namespace os
 }  // namespace android
\ No newline at end of file
diff --git a/cmds/statsd/src/stats_log_util.h b/cmds/statsd/src/stats_log_util.h
index 6583f57..32fe0b8 100644
--- a/cmds/statsd/src/stats_log_util.h
+++ b/cmds/statsd/src/stats_log_util.h
@@ -35,6 +35,24 @@
 // Convert the TimeUnit enum to the bucket size in millis.
 int64_t TimeUnitToBucketSizeInMillis(TimeUnit unit);
 
+// Gets the elapsed timestamp in ns.
+int64_t getElapsedRealtimeNs();
+
+// Gets the elapsed timestamp in millis.
+int64_t getElapsedRealtimeMillis();
+
+// Gets the elapsed timestamp in seconds.
+int64_t getElapsedRealtimeSec();
+
+// Gets the wall clock timestamp in ns.
+int64_t getWallClockNs();
+
+// Gets the wall clock timestamp in millis.
+int64_t getWallClockMillis();
+
+// Gets the wall clock timestamp in seconds.
+int64_t getWallClockSec();
+
 // Helper function to write PulledAtomStats to ProtoOutputStream
 void writePullerStatsToStream(const std::pair<int, StatsdStats::PulledAtomStats>& pair,
                               util::ProtoOutputStream* protoOutput);
diff --git a/cmds/statsd/src/storage/StorageManager.cpp b/cmds/statsd/src/storage/StorageManager.cpp
index 23bd5561..6a1db72 100644
--- a/cmds/statsd/src/storage/StorageManager.cpp
+++ b/cmds/statsd/src/storage/StorageManager.cpp
@@ -20,6 +20,7 @@
 #include "android-base/stringprintf.h"
 #include "guardrail/StatsdStats.h"
 #include "storage/StorageManager.h"
+#include "stats_log_util.h"
 
 #include <android-base/file.h>
 #include <dirent.h>
@@ -252,7 +253,7 @@
         string file_name = getFilePath(path, timestamp, uid, configID);
 
         // Check for timestamp and delete if it's too old.
-        long fileAge = time(nullptr) - timestamp;
+        long fileAge = getWallClockSec() - timestamp;
         if (fileAge > StatsdStats::kMaxAgeSecond) {
             deleteFile(file_name.c_str());
         }
diff --git a/cmds/statsd/tests/e2e/Attribution_e2e_test.cpp b/cmds/statsd/tests/e2e/Attribution_e2e_test.cpp
index 01743ef..93cd587 100644
--- a/cmds/statsd/tests/e2e/Attribution_e2e_test.cpp
+++ b/cmds/statsd/tests/e2e/Attribution_e2e_test.cpp
@@ -163,11 +163,11 @@
             "App1");
     EXPECT_EQ(data.bucket_info_size(), 2);
     EXPECT_EQ(data.bucket_info(0).count(), 2);
-    EXPECT_EQ(data.bucket_info(0).start_bucket_nanos(), bucketStartTimeNs);
-    EXPECT_EQ(data.bucket_info(0).end_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(0).start_bucket_elapsed_nanos(), bucketStartTimeNs);
+    EXPECT_EQ(data.bucket_info(0).end_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
     EXPECT_EQ(data.bucket_info(1).count(), 1);
-    EXPECT_EQ(data.bucket_info(1).start_bucket_nanos(), bucketStartTimeNs + 2 * bucketSizeNs);
-    EXPECT_EQ(data.bucket_info(1).end_bucket_nanos(), bucketStartTimeNs + 3 * bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(1).start_bucket_elapsed_nanos(), bucketStartTimeNs + 2 * bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(1).end_bucket_elapsed_nanos(), bucketStartTimeNs + 3 * bucketSizeNs);
 
     data = countMetrics.data(1);
     ValidateAttributionUidAndTagDimension(
@@ -175,11 +175,11 @@
             "GMSCoreModule1");
     EXPECT_EQ(data.bucket_info_size(), 2);
     EXPECT_EQ(data.bucket_info(0).count(), 1);
-    EXPECT_EQ(data.bucket_info(0).start_bucket_nanos(), bucketStartTimeNs);
-    EXPECT_EQ(data.bucket_info(0).end_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(0).start_bucket_elapsed_nanos(), bucketStartTimeNs);
+    EXPECT_EQ(data.bucket_info(0).end_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
     EXPECT_EQ(data.bucket_info(1).count(), 1);
-    EXPECT_EQ(data.bucket_info(1).start_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
-    EXPECT_EQ(data.bucket_info(1).end_bucket_nanos(), bucketStartTimeNs + 2 * bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(1).start_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(1).end_bucket_elapsed_nanos(), bucketStartTimeNs + 2 * bucketSizeNs);
 
     data = countMetrics.data(2);
     ValidateAttributionUidAndTagDimension(
@@ -187,8 +187,8 @@
             "GMSCoreModule3");
     EXPECT_EQ(data.bucket_info_size(), 1);
     EXPECT_EQ(data.bucket_info(0).count(), 1);
-    EXPECT_EQ(data.bucket_info(0).start_bucket_nanos(), bucketStartTimeNs + 3 * bucketSizeNs);
-    EXPECT_EQ(data.bucket_info(0).end_bucket_nanos(), bucketStartTimeNs + 4 * bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(0).start_bucket_elapsed_nanos(), bucketStartTimeNs + 3 * bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(0).end_bucket_elapsed_nanos(), bucketStartTimeNs + 4 * bucketSizeNs);
 
     data = countMetrics.data(3);
     ValidateAttributionUidAndTagDimension(
@@ -196,8 +196,8 @@
             "GMSCoreModule2");
     EXPECT_EQ(data.bucket_info_size(), 1);
     EXPECT_EQ(data.bucket_info(0).count(), 1);
-    EXPECT_EQ(data.bucket_info(0).start_bucket_nanos(), bucketStartTimeNs + 2 * bucketSizeNs);
-    EXPECT_EQ(data.bucket_info(0).end_bucket_nanos(), bucketStartTimeNs + 3 * bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(0).start_bucket_elapsed_nanos(), bucketStartTimeNs + 2 * bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(0).end_bucket_elapsed_nanos(), bucketStartTimeNs + 3 * bucketSizeNs);
 }
 
 #else
diff --git a/cmds/statsd/tests/e2e/DimensionInCondition_e2e_test.cpp b/cmds/statsd/tests/e2e/DimensionInCondition_e2e_test.cpp
index 275b5824..293f579 100644
--- a/cmds/statsd/tests/e2e/DimensionInCondition_e2e_test.cpp
+++ b/cmds/statsd/tests/e2e/DimensionInCondition_e2e_test.cpp
@@ -142,8 +142,8 @@
     auto data = countMetrics.data(0);
     EXPECT_EQ(data.bucket_info_size(), 1);
     EXPECT_EQ(data.bucket_info(0).count(), 1);
-    EXPECT_EQ(data.bucket_info(0).start_bucket_nanos(), bucketStartTimeNs);
-    EXPECT_EQ(data.bucket_info(0).end_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(0).start_bucket_elapsed_nanos(), bucketStartTimeNs);
+    EXPECT_EQ(data.bucket_info(0).end_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
     EXPECT_EQ(data.dimensions_in_what().field(), android::util::SCREEN_BRIGHTNESS_CHANGED);
     EXPECT_EQ(data.dimensions_in_what().value_tuple().dimensions_value_size(), 1);
     EXPECT_EQ(data.dimensions_in_what().value_tuple().dimensions_value(0).field(), 1);
@@ -153,8 +153,8 @@
     data = countMetrics.data(1);
     EXPECT_EQ(data.bucket_info_size(), 1);
     EXPECT_EQ(data.bucket_info(0).count(), 1);
-    EXPECT_EQ(data.bucket_info(0).start_bucket_nanos(), bucketStartTimeNs);
-    EXPECT_EQ(data.bucket_info(0).end_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(0).start_bucket_elapsed_nanos(), bucketStartTimeNs);
+    EXPECT_EQ(data.bucket_info(0).end_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
     EXPECT_EQ(data.dimensions_in_what().field(), android::util::SCREEN_BRIGHTNESS_CHANGED);
     EXPECT_EQ(data.dimensions_in_what().value_tuple().dimensions_value_size(), 1);
     EXPECT_EQ(data.dimensions_in_what().value_tuple().dimensions_value(0).field(), 1);
@@ -165,8 +165,8 @@
     data = countMetrics.data(2);
     EXPECT_EQ(data.bucket_info_size(), 1);
     EXPECT_EQ(data.bucket_info(0).count(), 3);
-    EXPECT_EQ(data.bucket_info(0).start_bucket_nanos(), bucketStartTimeNs);
-    EXPECT_EQ(data.bucket_info(0).end_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(0).start_bucket_elapsed_nanos(), bucketStartTimeNs);
+    EXPECT_EQ(data.bucket_info(0).end_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
     EXPECT_EQ(data.dimensions_in_what().field(), android::util::SCREEN_BRIGHTNESS_CHANGED);
     EXPECT_EQ(data.dimensions_in_what().value_tuple().dimensions_value_size(), 1);
     EXPECT_EQ(data.dimensions_in_what().value_tuple().dimensions_value(0).field(), 1);
@@ -177,11 +177,11 @@
     data = countMetrics.data(3);
     EXPECT_EQ(data.bucket_info_size(), 2);
     EXPECT_EQ(data.bucket_info(0).count(), 2);
-    EXPECT_EQ(data.bucket_info(0).start_bucket_nanos(), bucketStartTimeNs);
-    EXPECT_EQ(data.bucket_info(0).end_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(0).start_bucket_elapsed_nanos(), bucketStartTimeNs);
+    EXPECT_EQ(data.bucket_info(0).end_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
     EXPECT_EQ(data.bucket_info(1).count(), 1);
-    EXPECT_EQ(data.bucket_info(1).start_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
-    EXPECT_EQ(data.bucket_info(1).end_bucket_nanos(), bucketStartTimeNs + 2 * bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(1).start_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(1).end_bucket_elapsed_nanos(), bucketStartTimeNs + 2 * bucketSizeNs);
     EXPECT_EQ(data.dimensions_in_what().field(), android::util::SCREEN_BRIGHTNESS_CHANGED);
     EXPECT_EQ(data.dimensions_in_what().value_tuple().dimensions_value_size(), 1);
     EXPECT_EQ(data.dimensions_in_what().value_tuple().dimensions_value(0).field(), 1);
@@ -192,8 +192,8 @@
     data = countMetrics.data(4);
     EXPECT_EQ(data.bucket_info_size(), 1);
     EXPECT_EQ(data.bucket_info(0).count(), 2);
-    EXPECT_EQ(data.bucket_info(0).start_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
-    EXPECT_EQ(data.bucket_info(0).end_bucket_nanos(), bucketStartTimeNs + 2 * bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(0).start_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(0).end_bucket_elapsed_nanos(), bucketStartTimeNs + 2 * bucketSizeNs);
     EXPECT_EQ(data.dimensions_in_what().field(), android::util::SCREEN_BRIGHTNESS_CHANGED);
     EXPECT_EQ(data.dimensions_in_what().value_tuple().dimensions_value_size(), 1);
     EXPECT_EQ(data.dimensions_in_what().value_tuple().dimensions_value(0).field(), 1);
@@ -203,8 +203,8 @@
     data = countMetrics.data(5);
     EXPECT_EQ(data.bucket_info_size(), 1);
     EXPECT_EQ(data.bucket_info(0).count(), 1);
-    EXPECT_EQ(data.bucket_info(0).start_bucket_nanos(), bucketStartTimeNs);
-    EXPECT_EQ(data.bucket_info(0).end_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(0).start_bucket_elapsed_nanos(), bucketStartTimeNs);
+    EXPECT_EQ(data.bucket_info(0).end_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
     EXPECT_EQ(data.dimensions_in_what().field(), android::util::SCREEN_BRIGHTNESS_CHANGED);
     EXPECT_EQ(data.dimensions_in_what().value_tuple().dimensions_value_size(), 1);
     EXPECT_EQ(data.dimensions_in_what().value_tuple().dimensions_value(0).field(), 1);
@@ -215,8 +215,8 @@
     data = countMetrics.data(6);
     EXPECT_EQ(data.bucket_info_size(), 1);
     EXPECT_EQ(data.bucket_info(0).count(), 1);
-    EXPECT_EQ(data.bucket_info(0).start_bucket_nanos(), bucketStartTimeNs);
-    EXPECT_EQ(data.bucket_info(0).end_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(0).start_bucket_elapsed_nanos(), bucketStartTimeNs);
+    EXPECT_EQ(data.bucket_info(0).end_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
     EXPECT_EQ(data.dimensions_in_what().field(), android::util::SCREEN_BRIGHTNESS_CHANGED);
     EXPECT_EQ(data.dimensions_in_what().value_tuple().dimensions_value_size(), 1);
     EXPECT_EQ(data.dimensions_in_what().value_tuple().dimensions_value(0).field(), 1);
@@ -358,8 +358,8 @@
     EXPECT_FALSE(data.dimensions_in_condition().has_field());
     EXPECT_EQ(data.bucket_info_size(), 1);
     EXPECT_EQ(data.bucket_info(0).count(), 1);
-    EXPECT_EQ(data.bucket_info(0).start_bucket_nanos(), bucketStartTimeNs);
-    EXPECT_EQ(data.bucket_info(0).end_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(0).start_bucket_elapsed_nanos(), bucketStartTimeNs);
+    EXPECT_EQ(data.bucket_info(0).end_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
 
     data = countMetrics.data(1);
     EXPECT_EQ(data.dimensions_in_what().field(), android::util::PROCESS_LIFE_CYCLE_STATE_CHANGED);
@@ -370,8 +370,8 @@
                                           android::util::SYNC_STATE_CHANGED, 111, "App1");
     EXPECT_EQ(data.bucket_info_size(), 1);
     EXPECT_EQ(data.bucket_info(0).count(), 2);
-    EXPECT_EQ(data.bucket_info(0).start_bucket_nanos(), bucketStartTimeNs);
-    EXPECT_EQ(data.bucket_info(0).end_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(0).start_bucket_elapsed_nanos(), bucketStartTimeNs);
+    EXPECT_EQ(data.bucket_info(0).end_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
 
     data = countMetrics.data(2);
     EXPECT_EQ(data.dimensions_in_what().field(), android::util::PROCESS_LIFE_CYCLE_STATE_CHANGED);
@@ -381,8 +381,8 @@
     EXPECT_FALSE(data.dimensions_in_condition().has_field());
     EXPECT_EQ(data.bucket_info_size(), 1);
     EXPECT_EQ(data.bucket_info(0).count(), 2);
-    EXPECT_EQ(data.bucket_info(0).start_bucket_nanos(), bucketStartTimeNs);
-    EXPECT_EQ(data.bucket_info(0).end_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(0).start_bucket_elapsed_nanos(), bucketStartTimeNs);
+    EXPECT_EQ(data.bucket_info(0).end_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
 
     data = countMetrics.data(3);
     EXPECT_EQ(data.dimensions_in_what().field(), android::util::PROCESS_LIFE_CYCLE_STATE_CHANGED);
@@ -393,11 +393,11 @@
                                           android::util::SYNC_STATE_CHANGED, 333, "App2");
     EXPECT_EQ(data.bucket_info_size(), 2);
     EXPECT_EQ(data.bucket_info(0).count(), 1);
-    EXPECT_EQ(data.bucket_info(0).start_bucket_nanos(), bucketStartTimeNs);
-    EXPECT_EQ(data.bucket_info(0).end_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(0).start_bucket_elapsed_nanos(), bucketStartTimeNs);
+    EXPECT_EQ(data.bucket_info(0).end_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
     EXPECT_EQ(data.bucket_info(1).count(), 1);
-    EXPECT_EQ(data.bucket_info(1).start_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
-    EXPECT_EQ(data.bucket_info(1).end_bucket_nanos(), bucketStartTimeNs + 2 * bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(1).start_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(1).end_bucket_elapsed_nanos(), bucketStartTimeNs + 2 * bucketSizeNs);
 
     data = countMetrics.data(4);
     EXPECT_EQ(data.dimensions_in_what().field(), android::util::PROCESS_LIFE_CYCLE_STATE_CHANGED);
@@ -407,8 +407,8 @@
     EXPECT_FALSE(data.dimensions_in_condition().has_field());
     EXPECT_EQ(data.bucket_info_size(), 1);
     EXPECT_EQ(data.bucket_info(0).count(), 1);
-    EXPECT_EQ(data.bucket_info(0).start_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
-    EXPECT_EQ(data.bucket_info(0).end_bucket_nanos(), bucketStartTimeNs + 2 * bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(0).start_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
+    EXPECT_EQ(data.bucket_info(0).end_bucket_elapsed_nanos(), bucketStartTimeNs + 2 * bucketSizeNs);
 }
 
 namespace {
@@ -531,11 +531,11 @@
         EXPECT_FALSE(data.dimensions_in_condition().has_field());
         EXPECT_EQ(data.bucket_info_size(), 2);
         EXPECT_EQ(data.bucket_info(0).duration_nanos(), 9);
-        EXPECT_EQ(data.bucket_info(0).start_bucket_nanos(), bucketStartTimeNs);
-        EXPECT_EQ(data.bucket_info(0).end_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
+        EXPECT_EQ(data.bucket_info(0).start_bucket_elapsed_nanos(), bucketStartTimeNs);
+        EXPECT_EQ(data.bucket_info(0).end_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
         EXPECT_EQ(data.bucket_info(1).duration_nanos(), 30);
-        EXPECT_EQ(data.bucket_info(1).start_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
-        EXPECT_EQ(data.bucket_info(1).end_bucket_nanos(), bucketStartTimeNs + 2 * bucketSizeNs);
+        EXPECT_EQ(data.bucket_info(1).start_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
+        EXPECT_EQ(data.bucket_info(1).end_bucket_elapsed_nanos(), bucketStartTimeNs + 2 * bucketSizeNs);
 
         data = metrics.data(1);
         EXPECT_FALSE(data.dimensions_in_what().has_field());
@@ -543,11 +543,11 @@
                                               android::util::SYNC_STATE_CHANGED, 111, "App1");
         EXPECT_EQ(data.bucket_info_size(), 2);
         EXPECT_EQ(data.bucket_info(0).duration_nanos(), 500 - 201 + bucketSizeNs - 600);
-        EXPECT_EQ(data.bucket_info(0).start_bucket_nanos(), bucketStartTimeNs);
-        EXPECT_EQ(data.bucket_info(0).end_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
+        EXPECT_EQ(data.bucket_info(0).start_bucket_elapsed_nanos(), bucketStartTimeNs);
+        EXPECT_EQ(data.bucket_info(0).end_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
         EXPECT_EQ(data.bucket_info(1).duration_nanos(), 300);
-        EXPECT_EQ(data.bucket_info(1).start_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
-        EXPECT_EQ(data.bucket_info(1).end_bucket_nanos(), bucketStartTimeNs + 2 * bucketSizeNs);
+        EXPECT_EQ(data.bucket_info(1).start_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
+        EXPECT_EQ(data.bucket_info(1).end_bucket_elapsed_nanos(), bucketStartTimeNs + 2 * bucketSizeNs);
 
         data = metrics.data(2);
         EXPECT_FALSE(data.dimensions_in_what().has_field());
@@ -555,11 +555,11 @@
                                               android::util::SYNC_STATE_CHANGED, 333, "App2");
         EXPECT_EQ(data.bucket_info_size(), 2);
         EXPECT_EQ(data.bucket_info(0).duration_nanos(), 500 - 401 + bucketSizeNs - 600);
-        EXPECT_EQ(data.bucket_info(0).start_bucket_nanos(), bucketStartTimeNs);
-        EXPECT_EQ(data.bucket_info(0).end_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
+        EXPECT_EQ(data.bucket_info(0).start_bucket_elapsed_nanos(), bucketStartTimeNs);
+        EXPECT_EQ(data.bucket_info(0).end_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
         EXPECT_EQ(data.bucket_info(1).duration_nanos(), 700);
-        EXPECT_EQ(data.bucket_info(1).start_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
-        EXPECT_EQ(data.bucket_info(1).end_bucket_nanos(), bucketStartTimeNs + 2 * bucketSizeNs);
+        EXPECT_EQ(data.bucket_info(1).start_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
+        EXPECT_EQ(data.bucket_info(1).end_bucket_elapsed_nanos(), bucketStartTimeNs + 2 * bucketSizeNs);
     }
 }
 
@@ -693,8 +693,8 @@
         EXPECT_FALSE(data.dimensions_in_condition().has_field());
         EXPECT_EQ(data.bucket_info_size(), 1);
         EXPECT_EQ(data.bucket_info(0).duration_nanos(), 9);
-        EXPECT_EQ(data.bucket_info(0).start_bucket_nanos(), bucketStartTimeNs);
-        EXPECT_EQ(data.bucket_info(0).end_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
+        EXPECT_EQ(data.bucket_info(0).start_bucket_elapsed_nanos(), bucketStartTimeNs);
+        EXPECT_EQ(data.bucket_info(0).end_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
 
         data = metrics.data(1);
         EXPECT_EQ(data.dimensions_in_what().value_tuple().dimensions_value(0).field(), 1);
@@ -703,11 +703,11 @@
                                               android::util::SYNC_STATE_CHANGED, 111, "App1");
         EXPECT_EQ(data.bucket_info_size(), 2);
         EXPECT_EQ(data.bucket_info(0).duration_nanos(), bucketSizeNs - 201);
-        EXPECT_EQ(data.bucket_info(0).start_bucket_nanos(), bucketStartTimeNs);
-        EXPECT_EQ(data.bucket_info(0).end_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
+        EXPECT_EQ(data.bucket_info(0).start_bucket_elapsed_nanos(), bucketStartTimeNs);
+        EXPECT_EQ(data.bucket_info(0).end_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
         EXPECT_EQ(data.bucket_info(1).duration_nanos(), 100);
-        EXPECT_EQ(data.bucket_info(1).start_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
-        EXPECT_EQ(data.bucket_info(1).end_bucket_nanos(), bucketStartTimeNs + 2 * bucketSizeNs);
+        EXPECT_EQ(data.bucket_info(1).start_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
+        EXPECT_EQ(data.bucket_info(1).end_bucket_elapsed_nanos(), bucketStartTimeNs + 2 * bucketSizeNs);
 
         data = metrics.data(2);
         EXPECT_EQ(data.dimensions_in_what().value_tuple().dimensions_value(0).field(), 1);
@@ -716,11 +716,11 @@
                                               android::util::SYNC_STATE_CHANGED, 333, "App2");
         EXPECT_EQ(data.bucket_info_size(), 2);
         EXPECT_EQ(data.bucket_info(0).duration_nanos(), bucketSizeNs - 401);
-        EXPECT_EQ(data.bucket_info(0).start_bucket_nanos(), bucketStartTimeNs);
-        EXPECT_EQ(data.bucket_info(0).end_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
+        EXPECT_EQ(data.bucket_info(0).start_bucket_elapsed_nanos(), bucketStartTimeNs);
+        EXPECT_EQ(data.bucket_info(0).end_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
         EXPECT_EQ(data.bucket_info(1).duration_nanos(), 700);
-        EXPECT_EQ(data.bucket_info(1).start_bucket_nanos(), bucketStartTimeNs + bucketSizeNs);
-        EXPECT_EQ(data.bucket_info(1).end_bucket_nanos(), bucketStartTimeNs + 2 * bucketSizeNs);
+        EXPECT_EQ(data.bucket_info(1).start_bucket_elapsed_nanos(), bucketStartTimeNs + bucketSizeNs);
+        EXPECT_EQ(data.bucket_info(1).end_bucket_elapsed_nanos(), bucketStartTimeNs + 2 * bucketSizeNs);
     }
 }
 
diff --git a/cmds/statsd/tests/e2e/WakelockDuration_e2e_test.cpp b/cmds/statsd/tests/e2e/WakelockDuration_e2e_test.cpp
index 3b25694b..024fa3e 100644
--- a/cmds/statsd/tests/e2e/WakelockDuration_e2e_test.cpp
+++ b/cmds/statsd/tests/e2e/WakelockDuration_e2e_test.cpp
@@ -315,9 +315,9 @@
                                     android::util::WAKELOCK_STATE_CHANGED, 111);
     // The last wakelock holding spans 4 buckets.
     EXPECT_EQ((unsigned long long)data.bucket_info(1).duration_nanos(), 3 * bucketSizeNs);
-    EXPECT_EQ((unsigned long long)data.bucket_info(1).start_bucket_nanos(),
+    EXPECT_EQ((unsigned long long)data.bucket_info(1).start_bucket_elapsed_nanos(),
               bucketStartTimeNs + 5 * bucketSizeNs);
-    EXPECT_EQ((unsigned long long)data.bucket_info(1).end_bucket_nanos(),
+    EXPECT_EQ((unsigned long long)data.bucket_info(1).end_bucket_elapsed_nanos(),
               bucketStartTimeNs + 6 * bucketSizeNs);
 }
 
diff --git a/cmds/statsd/tests/guardrail/StatsdStats_test.cpp b/cmds/statsd/tests/guardrail/StatsdStats_test.cpp
index a134300..bd11443 100644
--- a/cmds/statsd/tests/guardrail/StatsdStats_test.cpp
+++ b/cmds/statsd/tests/guardrail/StatsdStats_test.cpp
@@ -225,7 +225,7 @@
     bool dropboxAtomGood = false;
 
     for (const auto& atomStats : report.atom_stats()) {
-        if (atomStats.tag() == android::util::SENSOR_STATE_CHANGED && atomStats.count() == 2) {
+        if (atomStats.tag() == android::util::SENSOR_STATE_CHANGED && atomStats.count() == 3) {
             sensorAtomGood = true;
         }
         if (atomStats.tag() == android::util::DROPBOX_ERROR_CHANGED && atomStats.count() == 1) {
diff --git a/cmds/statsd/tests/metrics/CountMetricProducer_test.cpp b/cmds/statsd/tests/metrics/CountMetricProducer_test.cpp
index 1e71b73..d9dbf1d 100644
--- a/cmds/statsd/tests/metrics/CountMetricProducer_test.cpp
+++ b/cmds/statsd/tests/metrics/CountMetricProducer_test.cpp
@@ -48,7 +48,9 @@
     metric.set_bucket(ONE_MINUTE);
 
     LogEvent event1(tagId, bucketStartTimeNs + 1);
+    event1.init();
     LogEvent event2(tagId, bucketStartTimeNs + 2);
+    event2.init();
 
     sp<MockConditionWizard> wizard = new NaggyMock<MockConditionWizard>();
 
@@ -76,6 +78,8 @@
 
     // 1 matched event happens in bucket 2.
     LogEvent event3(tagId, bucketStartTimeNs + bucketSizeNs + 2);
+    event3.init();
+
     countProducer.onMatchedLogEvent(1 /*log matcher index*/, event3);
     countProducer.flushIfNeededLocked(bucketStartTimeNs + 2 * bucketSizeNs + 1);
     EXPECT_EQ(1UL, countProducer.mPastBuckets.size());
@@ -106,7 +110,10 @@
     metric.set_condition(StringToId("SCREEN_ON"));
 
     LogEvent event1(1, bucketStartTimeNs + 1);
+    event1.init();
+
     LogEvent event2(1, bucketStartTimeNs + 10);
+    event2.init();
 
     sp<MockConditionWizard> wizard = new NaggyMock<MockConditionWizard>();
 
@@ -326,12 +333,19 @@
 
     int tagId = 1;
     LogEvent event1(tagId, bucketStartTimeNs + 1);
+    event1.init();
     LogEvent event2(tagId, bucketStartTimeNs + 2);
+    event2.init();
     LogEvent event3(tagId, bucketStartTimeNs + 2 * bucketSizeNs + 1);
+    event3.init();
     LogEvent event4(tagId, bucketStartTimeNs + 3 * bucketSizeNs + 1);
+    event4.init();
     LogEvent event5(tagId, bucketStartTimeNs + 3 * bucketSizeNs + 2);
+    event5.init();
     LogEvent event6(tagId, bucketStartTimeNs + 3 * bucketSizeNs + 3);
+    event6.init();
     LogEvent event7(tagId, bucketStartTimeNs + 3 * bucketSizeNs + 2 * NS_PER_SEC);
+    event7.init();
 
     // Two events in bucket #0.
     countProducer.onMatchedLogEvent(1 /*log matcher index*/, event1);
@@ -355,13 +369,13 @@
     EXPECT_EQ(3L, countProducer.mCurrentSlicedCounter->begin()->second);
     // Anomaly at event 6 is within refractory period. The alarm is at event 5 timestamp not event 6
     EXPECT_EQ(anomalyTracker->getRefractoryPeriodEndsSec(DEFAULT_METRIC_DIMENSION_KEY),
-            event5.GetTimestampNs() / NS_PER_SEC + refPeriodSec);
+            event5.GetElapsedTimestampNs() / NS_PER_SEC + refPeriodSec);
 
     countProducer.onMatchedLogEvent(1 /*log matcher index*/, event7);
     EXPECT_EQ(1UL, countProducer.mCurrentSlicedCounter->size());
     EXPECT_EQ(4L, countProducer.mCurrentSlicedCounter->begin()->second);
     EXPECT_EQ(anomalyTracker->getRefractoryPeriodEndsSec(DEFAULT_METRIC_DIMENSION_KEY),
-            event7.GetTimestampNs() / NS_PER_SEC + refPeriodSec);
+            event7.GetElapsedTimestampNs() / NS_PER_SEC + refPeriodSec);
 }
 
 }  // namespace statsd
diff --git a/cmds/statsd/tests/metrics/DurationMetricProducer_test.cpp b/cmds/statsd/tests/metrics/DurationMetricProducer_test.cpp
index 23e15f7..57e2794 100644
--- a/cmds/statsd/tests/metrics/DurationMetricProducer_test.cpp
+++ b/cmds/statsd/tests/metrics/DurationMetricProducer_test.cpp
@@ -51,7 +51,9 @@
 
     int tagId = 1;
     LogEvent event1(tagId, bucketStartTimeNs + 1);
+    event1.init();
     LogEvent event2(tagId, bucketStartTimeNs + bucketSizeNs + 2);
+    event2.init();
 
     FieldMatcher dimensions;
     DurationMetricProducer durationProducer(
@@ -86,9 +88,13 @@
 
     int tagId = 1;
     LogEvent event1(tagId, bucketStartTimeNs + 1);
+    event1.init();
     LogEvent event2(tagId, bucketStartTimeNs + 2);
+    event2.init();
     LogEvent event3(tagId, bucketStartTimeNs + bucketSizeNs + 1);
+    event3.init();
     LogEvent event4(tagId, bucketStartTimeNs + bucketSizeNs + 3);
+    event4.init();
 
     FieldMatcher dimensions;
     DurationMetricProducer durationProducer(
@@ -144,7 +150,9 @@
             kConfigKey, metric, -1 /* no condition */, 1 /* start index */, 2 /* stop index */,
             3 /* stop_all index */, false /*nesting*/, wizard, dimensions, bucketStartTimeNs);
 
-    durationProducer.onMatchedLogEvent(1 /* start index*/, LogEvent(tagId, startTimeNs));
+    LogEvent start_event(tagId, startTimeNs);
+    start_event.init();
+    durationProducer.onMatchedLogEvent(1 /* start index*/, start_event);
     EXPECT_EQ(0UL, durationProducer.mPastBuckets.size());
     EXPECT_EQ(bucketStartTimeNs, durationProducer.mCurrentBucketStartTimeNs);
 
@@ -158,7 +166,9 @@
     EXPECT_EQ(eventUpgradeTimeNs, durationProducer.mCurrentBucketStartTimeNs);
 
     // We skip ahead one bucket, so we fill in the first two partial buckets and one full bucket.
-    durationProducer.onMatchedLogEvent(2 /* stop index*/, LogEvent(tagId, endTimeNs));
+    LogEvent end_event(tagId, endTimeNs);
+    end_event.init();
+    durationProducer.onMatchedLogEvent(2 /* stop index*/, end_event);
     buckets = durationProducer.mPastBuckets[DEFAULT_METRIC_DIMENSION_KEY];
     EXPECT_EQ(3UL, buckets.size());
     EXPECT_EQ(eventUpgradeTimeNs, buckets[1].mBucketStartNs);
@@ -194,7 +204,9 @@
             kConfigKey, metric, -1 /* no condition */, 1 /* start index */, 2 /* stop index */,
             3 /* stop_all index */, false /*nesting*/, wizard, dimensions, bucketStartTimeNs);
 
-    durationProducer.onMatchedLogEvent(1 /* start index*/, LogEvent(tagId, startTimeNs));
+    LogEvent start_event(tagId, startTimeNs);
+    start_event.init();
+    durationProducer.onMatchedLogEvent(1 /* start index*/, start_event);
     EXPECT_EQ(0UL, durationProducer.mPastBuckets.size());
     EXPECT_EQ(bucketStartTimeNs, durationProducer.mCurrentBucketStartTimeNs);
 
@@ -211,7 +223,9 @@
     EXPECT_EQ(eventUpgradeTimeNs, durationProducer.mCurrentBucketStartTimeNs);
 
     // We skip ahead one bucket, so we fill in the first two partial buckets and one full bucket.
-    durationProducer.onMatchedLogEvent(2 /* stop index*/, LogEvent(tagId, endTimeNs));
+    LogEvent end_event(tagId, endTimeNs);
+    end_event.init();
+    durationProducer.onMatchedLogEvent(2 /* stop index*/, end_event);
     buckets = durationProducer.mPastBuckets[DEFAULT_METRIC_DIMENSION_KEY];
     EXPECT_EQ(3UL, buckets.size());
     EXPECT_EQ(eventUpgradeTimeNs, buckets[2].mBucketStartNs);
@@ -245,10 +259,14 @@
     sp<AnomalyTracker> anomalyTracker = durationProducer.addAnomalyTracker(alert);
     EXPECT_TRUE(anomalyTracker != nullptr);
 
-    durationProducer.onMatchedLogEvent(1 /* start index*/, LogEvent(tagId, startTimeNs));
+    LogEvent start_event(tagId, startTimeNs);
+    start_event.init();
+    durationProducer.onMatchedLogEvent(1 /* start index*/, start_event);
     durationProducer.notifyAppUpgrade(eventUpgradeTimeNs, "ANY.APP", 1, 1);
     // We skip ahead one bucket, so we fill in the first two partial buckets and one full bucket.
-    durationProducer.onMatchedLogEvent(2 /* stop index*/, LogEvent(tagId, endTimeNs));
+    LogEvent end_event(tagId, endTimeNs);
+    end_event.init();
+    durationProducer.onMatchedLogEvent(2 /* stop index*/, end_event);
 
     EXPECT_EQ(bucketStartTimeNs + bucketSizeNs - startTimeNs,
               (uint64_t)anomalyTracker->getSumOverPastBuckets(DEFAULT_METRIC_DIMENSION_KEY));
@@ -276,7 +294,9 @@
             kConfigKey, metric, -1 /* no condition */, 1 /* start index */, 2 /* stop index */,
             3 /* stop_all index */, false /*nesting*/, wizard, dimensions, bucketStartTimeNs);
 
-    durationProducer.onMatchedLogEvent(1 /* start index*/, LogEvent(tagId, startTimeNs));
+    LogEvent start_event(tagId, startTimeNs);
+    start_event.init();
+    durationProducer.onMatchedLogEvent(1 /* start index*/, start_event);
     EXPECT_EQ(0UL, durationProducer.mPastBuckets.size());
     EXPECT_EQ(bucketStartTimeNs, durationProducer.mCurrentBucketStartTimeNs);
 
@@ -285,7 +305,9 @@
     EXPECT_EQ(eventUpgradeTimeNs, durationProducer.mCurrentBucketStartTimeNs);
 
     // We skip ahead one bucket, so we fill in the first two partial buckets and one full bucket.
-    durationProducer.onMatchedLogEvent(2 /* stop index*/, LogEvent(tagId, endTimeNs));
+    LogEvent end_event(tagId, endTimeNs);
+    end_event.init();
+    durationProducer.onMatchedLogEvent(2 /* stop index*/, end_event);
     EXPECT_EQ(0UL, durationProducer.mPastBuckets[DEFAULT_METRIC_DIMENSION_KEY].size());
 
     durationProducer.flushIfNeededLocked(bucketStartTimeNs + 3 * bucketSizeNs + 1);
@@ -319,7 +341,9 @@
             kConfigKey, metric, -1 /* no condition */, 1 /* start index */, 2 /* stop index */,
             3 /* stop_all index */, false /*nesting*/, wizard, dimensions, bucketStartTimeNs);
 
-    durationProducer.onMatchedLogEvent(1 /* start index*/, LogEvent(tagId, startTimeNs));
+    LogEvent start_event(tagId, startTimeNs);
+    start_event.init();
+    durationProducer.onMatchedLogEvent(1 /* start index*/, start_event);
     EXPECT_EQ(0UL, durationProducer.mPastBuckets.size());
     EXPECT_EQ(bucketStartTimeNs, durationProducer.mCurrentBucketStartTimeNs);
 
@@ -328,7 +352,9 @@
     EXPECT_EQ(eventUpgradeTimeNs, durationProducer.mCurrentBucketStartTimeNs);
 
     // Stop occurs in the same partial bucket as created for the app upgrade.
-    durationProducer.onMatchedLogEvent(2 /* stop index*/, LogEvent(tagId, endTimeNs));
+    LogEvent end_event(tagId, endTimeNs);
+    end_event.init();
+    durationProducer.onMatchedLogEvent(2 /* stop index*/, end_event);
     EXPECT_EQ(0UL, durationProducer.mPastBuckets[DEFAULT_METRIC_DIMENSION_KEY].size());
     EXPECT_EQ(eventUpgradeTimeNs, durationProducer.mCurrentBucketStartTimeNs);
 
diff --git a/cmds/statsd/tests/metrics/GaugeMetricProducer_test.cpp b/cmds/statsd/tests/metrics/GaugeMetricProducer_test.cpp
index 26f7c26..8b4273b 100644
--- a/cmds/statsd/tests/metrics/GaugeMetricProducer_test.cpp
+++ b/cmds/statsd/tests/metrics/GaugeMetricProducer_test.cpp
@@ -387,7 +387,7 @@
                            .mFields->begin()
                            ->mValue.int_value);
     EXPECT_EQ(anomalyTracker->getRefractoryPeriodEndsSec(DEFAULT_METRIC_DIMENSION_KEY),
-            event2->GetTimestampNs() / NS_PER_SEC + refPeriodSec);
+            event2->GetElapsedTimestampNs() / NS_PER_SEC + refPeriodSec);
 
     std::shared_ptr<LogEvent> event3 =
             std::make_shared<LogEvent>(tagId, bucketStartTimeNs + 2 * bucketSizeNs + 10);
@@ -402,7 +402,7 @@
                            .mFields->begin()
                            ->mValue.int_value);
     EXPECT_EQ(anomalyTracker->getRefractoryPeriodEndsSec(DEFAULT_METRIC_DIMENSION_KEY),
-            event2->GetTimestampNs() / NS_PER_SEC + refPeriodSec);
+            event2->GetElapsedTimestampNs() / NS_PER_SEC + refPeriodSec);
 
     // The event4 does not have the gauge field. Thus the current bucket value is 0.
     std::shared_ptr<LogEvent> event4 =
diff --git a/cmds/statsd/tests/metrics/ValueMetricProducer_test.cpp b/cmds/statsd/tests/metrics/ValueMetricProducer_test.cpp
index 325a372..6e66c6e 100644
--- a/cmds/statsd/tests/metrics/ValueMetricProducer_test.cpp
+++ b/cmds/statsd/tests/metrics/ValueMetricProducer_test.cpp
@@ -406,16 +406,16 @@
     valueProducer.onMatchedLogEvent(1 /*log matcher index*/, *event4);
     // Anomaly at event 4 since Value sum == 131 > 130!
     EXPECT_EQ(anomalyTracker->getRefractoryPeriodEndsSec(DEFAULT_METRIC_DIMENSION_KEY),
-            event4->GetTimestampNs() / NS_PER_SEC + refPeriodSec);
+            event4->GetElapsedTimestampNs() / NS_PER_SEC + refPeriodSec);
     valueProducer.onMatchedLogEvent(1 /*log matcher index*/, *event5);
     // Event 5 is within 3 sec refractory period. Thus last alarm timestamp is still event4.
     EXPECT_EQ(anomalyTracker->getRefractoryPeriodEndsSec(DEFAULT_METRIC_DIMENSION_KEY),
-            event4->GetTimestampNs() / NS_PER_SEC + refPeriodSec);
+            event4->GetElapsedTimestampNs() / NS_PER_SEC + refPeriodSec);
 
     valueProducer.onMatchedLogEvent(1 /*log matcher index*/, *event6);
     // Anomaly at event 6 since Value sum == 160 > 130 and after refractory period.
     EXPECT_EQ(anomalyTracker->getRefractoryPeriodEndsSec(DEFAULT_METRIC_DIMENSION_KEY),
-            event6->GetTimestampNs() / NS_PER_SEC + refPeriodSec);
+            event6->GetElapsedTimestampNs() / NS_PER_SEC + refPeriodSec);
 }
 
 }  // namespace statsd
diff --git a/cmds/statsd/tests/statsd_test_util.cpp b/cmds/statsd/tests/statsd_test_util.cpp
index d3a89617..b7acef7 100644
--- a/cmds/statsd/tests/statsd_test_util.cpp
+++ b/cmds/statsd/tests/statsd_test_util.cpp
@@ -406,7 +406,7 @@
 void sortLogEventsByTimestamp(std::vector<std::unique_ptr<LogEvent>> *events) {
   std::sort(events->begin(), events->end(),
             [](const std::unique_ptr<LogEvent>& a, const std::unique_ptr<LogEvent>& b) {
-              return a->GetTimestampNs() < b->GetTimestampNs();
+              return a->GetElapsedTimestampNs() < b->GetElapsedTimestampNs();
             });
 }
 
diff --git a/cmds/statsd/tools/dogfood/src/com/android/statsd/dogfood/DisplayProtoUtils.java b/cmds/statsd/tools/dogfood/src/com/android/statsd/dogfood/DisplayProtoUtils.java
index 03e5fef..b6b16e4 100644
--- a/cmds/statsd/tools/dogfood/src/com/android/statsd/dogfood/DisplayProtoUtils.java
+++ b/cmds/statsd/tools/dogfood/src/com/android/statsd/dogfood/DisplayProtoUtils.java
@@ -32,9 +32,9 @@
 
         for (StatsLog.ConfigMetricsReport report : reports.getReportsList()) {
             sb.append("StatsLogReport size: ").append(report.getMetricsCount()).append("\n");
-            sb.append("Last report time:").append(getDateStr(report.getLastReportNanos())).
+            sb.append("Last report time:").append(getDateStr(report.getLastReportElapsedNanos())).
                     append("\n");
-            sb.append("Current report time:").append(getDateStr(report.getCurrentReportNanos())).
+            sb.append("Current report time:").append(getDateStr(report.getCurrentReportElapsedNanos())).
                     append("\n");
             for (StatsLog.StatsLogReport log : report.getMetricsList()) {
                 sb.append("\n\n");
@@ -109,8 +109,8 @@
             }
 
             for (StatsLog.DurationBucketInfo info : duration.getBucketInfoList())  {
-                sb.append("\t[").append(getDateStr(info.getStartBucketNanos())).append("-")
-                        .append(getDateStr(info.getEndBucketNanos())).append("] -> ")
+                sb.append("\t[").append(getDateStr(info.getStartBucketElapsedNanos())).append("-")
+                        .append(getDateStr(info.getEndBucketElapsedNanos())).append("] -> ")
                         .append(info.getDurationNanos()).append(" ns\n");
             }
         }
@@ -121,7 +121,7 @@
         StatsLog.StatsLogReport.EventMetricDataWrapper eventMetricDataWrapper =
                 log.getEventMetrics();
         for (StatsLog.EventMetricData event : eventMetricDataWrapper.getDataList()) {
-            sb.append(getDateStr(event.getTimestampNanos())).append(": ");
+            sb.append(getDateStr(event.getElapsedTimestampNanos())).append(": ");
             sb.append(event.getAtom().getPushedCase().toString()).append("\n");
         }
     }
@@ -141,8 +141,8 @@
             }
 
             for (StatsLog.CountBucketInfo info : count.getBucketInfoList())  {
-                sb.append("\t[").append(getDateStr(info.getStartBucketNanos())).append("-")
-                        .append(getDateStr(info.getEndBucketNanos())).append("] -> ")
+                sb.append("\t[").append(getDateStr(info.getStartBucketElapsedNanos())).append("-")
+                        .append(getDateStr(info.getEndBucketElapsedNanos())).append("] -> ")
                         .append(info.getCount()).append("\n");
             }
         }
diff --git a/cmds/statsd/tools/loadtest/src/com/android/statsd/loadtest/DisplayProtoUtils.java b/cmds/statsd/tools/loadtest/src/com/android/statsd/loadtest/DisplayProtoUtils.java
index 87b82c2..d55f3f3 100644
--- a/cmds/statsd/tools/loadtest/src/com/android/statsd/loadtest/DisplayProtoUtils.java
+++ b/cmds/statsd/tools/loadtest/src/com/android/statsd/loadtest/DisplayProtoUtils.java
@@ -36,9 +36,9 @@
         int numMetrics = 0;
         for (StatsLog.ConfigMetricsReport report : reports.getReportsList()) {
             sb.append("StatsLogReport size: ").append(report.getMetricsCount()).append("\n");
-            sb.append("Last report time:").append(getDateStr(report.getLastReportNanos())).
+            sb.append("Last report time:").append(getDateStr(report.getLastReportElapsedNanos())).
                     append("\n");
-            sb.append("Current report time:").append(getDateStr(report.getCurrentReportNanos())).
+            sb.append("Current report time:").append(getDateStr(report.getCurrentReportElapsedNanos())).
                     append("\n");
             for (StatsLog.StatsLogReport log : report.getMetricsList()) {
                 numMetrics++;
@@ -120,8 +120,8 @@
             }
 
             for (StatsLog.DurationBucketInfo info : duration.getBucketInfoList())  {
-                sb.append("\t[").append(getDateStr(info.getStartBucketNanos())).append("-")
-                        .append(getDateStr(info.getEndBucketNanos())).append("] -> ")
+                sb.append("\t[").append(getDateStr(info.getStartBucketElapsedNanos())).append("-")
+                        .append(getDateStr(info.getEndBucketElapsedNanos())).append("] -> ")
                         .append(info.getDurationNanos()).append(" ns\n");
             }
         }
@@ -132,7 +132,7 @@
         StatsLog.StatsLogReport.EventMetricDataWrapper eventMetricDataWrapper =
                 log.getEventMetrics();
         for (StatsLog.EventMetricData event : eventMetricDataWrapper.getDataList()) {
-            sb.append(getDateStr(event.getTimestampNanos())).append(": ");
+            sb.append(getDateStr(event.getElapsedTimestampNanos())).append(": ");
             sb.append(event.getAtom().getPushedCase().toString()).append("\n");
         }
     }
@@ -152,8 +152,8 @@
             }
 
             for (StatsLog.CountBucketInfo info : count.getBucketInfoList())  {
-                sb.append("\t[").append(getDateStr(info.getStartBucketNanos())).append("-")
-                        .append(getDateStr(info.getEndBucketNanos())).append("] -> ")
+                sb.append("\t[").append(getDateStr(info.getStartBucketElapsedNanos())).append("-")
+                        .append(getDateStr(info.getEndBucketElapsedNanos())).append("] -> ")
                         .append(info.getCount()).append("\n");
             }
         }
diff --git a/services/core/java/com/android/server/stats/StatsCompanionService.java b/services/core/java/com/android/server/stats/StatsCompanionService.java
index 4bc9404..9f9b1af 100644
--- a/services/core/java/com/android/server/stats/StatsCompanionService.java
+++ b/services/core/java/com/android/server/stats/StatsCompanionService.java
@@ -361,9 +361,11 @@
         if (DEBUG) Slog.d(TAG, "Setting anomaly alarm for " + timestampMs);
         final long callingToken = Binder.clearCallingIdentity();
         try {
-            // using RTC, not RTC_WAKEUP, so if device is asleep, will only fire when it awakens.
+            // using ELAPSED_REALTIME, not ELAPSED_REALTIME_WAKEUP, so if device is asleep, will
+            // only fire when it awakens.
+            // This alarm is inexact, leaving its exactness completely up to the OS optimizations.
             // AlarmManager will automatically cancel any previous mAnomalyAlarmIntent alarm.
-            mAlarmManager.setExact(AlarmManager.RTC, timestampMs, mAnomalyAlarmIntent);
+            mAlarmManager.setExact(AlarmManager.ELAPSED_REALTIME, timestampMs, mAnomalyAlarmIntent);
         } finally {
             Binder.restoreCallingIdentity(callingToken);
         }
@@ -388,10 +390,12 @@
             Slog.d(TAG, "Setting pulling alarm for " + timestampMs + " every " + intervalMs + "ms");
         final long callingToken = Binder.clearCallingIdentity();
         try {
-            // using RTC, not RTC_WAKEUP, so if device is asleep, will only fire when it awakens.
+            // using ELAPSED_REALTIME, not ELAPSED_REALTIME_WAKEUP, so if device is asleep, will
+            // only fire when it awakens.
             // This alarm is inexact, leaving its exactness completely up to the OS optimizations.
             // TODO: totally inexact means that stats per bucket could be quite off. Is this okay?
-            mAlarmManager.setRepeating(AlarmManager.RTC, timestampMs, intervalMs, mPullingAlarmIntent);
+            mAlarmManager.setRepeating(AlarmManager.ELAPSED_REALTIME, timestampMs, intervalMs,
+                    mPullingAlarmIntent);
         } finally {
             Binder.restoreCallingIdentity(callingToken);
         }
diff --git a/tools/stats_log_api_gen/Android.bp b/tools/stats_log_api_gen/Android.bp
index e301eb1..dc2ed43 100644
--- a/tools/stats_log_api_gen/Android.bp
+++ b/tools/stats_log_api_gen/Android.bp
@@ -102,6 +102,7 @@
     export_generated_headers: ["statslog.h"],
     shared_libs: [
         "liblog",
+        "libutils",
     ],
 }
 
diff --git a/tools/stats_log_api_gen/main.cpp b/tools/stats_log_api_gen/main.cpp
index 3dbb503..a78b1a2 100644
--- a/tools/stats_log_api_gen/main.cpp
+++ b/tools/stats_log_api_gen/main.cpp
@@ -105,6 +105,7 @@
     fprintf(out, "#include <log/log_event_list.h>\n");
     fprintf(out, "#include <log/log.h>\n");
     fprintf(out, "#include <statslog.h>\n");
+    fprintf(out, "#include <utils/SystemClock.h>\n");
     fprintf(out, "\n");
 
     fprintf(out, "namespace android {\n");
@@ -145,6 +146,7 @@
         fprintf(out, "{\n");
         argIndex = 1;
         fprintf(out, "    android_log_event_list event(kStatsEventTag);\n");
+        fprintf(out, "    event << android::elapsedRealtimeNano();\n\n");
         fprintf(out, "    event << code;\n\n");
         for (vector<java_type_t>::const_iterator arg = signature->begin();
             arg != signature->end(); arg++) {