diff --git a/src/plugins/qmlprofiler/qmlprofilermodelmanager.cpp b/src/plugins/qmlprofiler/qmlprofilermodelmanager.cpp
index 2b476e1b2f1..7c85817841e 100644
--- a/src/plugins/qmlprofiler/qmlprofilermodelmanager.cpp
+++ b/src/plugins/qmlprofiler/qmlprofilermodelmanager.cpp
@@ -92,18 +92,23 @@ bool QmlProfilerTraceTime::isRestrictedToRange() const
 void QmlProfilerTraceTime::clear()
 {
     restrictToRange(-1, -1);
-    setTime(-1, -1);
+    m_startTime = -1;
+    m_endTime = -1;
 }
 
-void QmlProfilerTraceTime::setTime(qint64 startTime, qint64 endTime)
+void QmlProfilerTraceTime::update(qint64 time)
 {
-    QTC_ASSERT(startTime <= endTime, endTime = startTime);
-    m_startTime = startTime;
-    m_endTime = endTime;
+    QTC_ASSERT(time >= 0, return);
+    if (m_startTime > time || m_startTime == -1)
+        m_startTime = time;
+    if (m_endTime < time || m_endTime == -1)
+        m_endTime = time;
+    QTC_ASSERT(m_endTime >= m_startTime, m_startTime = m_endTime);
 }
 
 void QmlProfilerTraceTime::decreaseStartTime(qint64 time)
 {
+    QTC_ASSERT(time >= 0, return);
     if (m_startTime > time || m_startTime == -1) {
         m_startTime = time;
         if (m_endTime == -1)
@@ -115,6 +120,7 @@ void QmlProfilerTraceTime::decreaseStartTime(qint64 time)
 
 void QmlProfilerTraceTime::increaseEndTime(qint64 time)
 {
+    QTC_ASSERT(time >= 0, return);
     if (m_endTime < time || m_endTime == -1) {
         m_endTime = time;
         if (m_startTime == -1)
@@ -244,6 +250,7 @@ void QmlProfilerModelManager::addEvents(const QVector<QmlEvent> &events)
 {
     for (const QmlEvent &event : events) {
         d->eventStream << event;
+        d->traceTime->update(event.timestamp());
         d->dispatch(event, d->eventTypes[event.typeIndex()]);
     }
 }
@@ -251,6 +258,7 @@ void QmlProfilerModelManager::addEvents(const QVector<QmlEvent> &events)
 void QmlProfilerModelManager::addEvent(const QmlEvent &event)
 {
     d->eventStream << event;
+    d->traceTime->update(event.timestamp());
     QTC_ASSERT(event.typeIndex() < d->eventTypes.size(),
                d->eventTypes.resize(event.typeIndex() + 1));
     d->dispatch(event, d->eventTypes.at(event.typeIndex()));
@@ -606,7 +614,10 @@ void QmlProfilerModelManager::load(const QString &filename)
             this, &QmlProfilerModelManager::addEvents);
 
     connect(reader, &QmlProfilerFileReader::success, this, [this, reader]() {
-        d->traceTime->setTime(reader->traceStart(), reader->traceEnd());
+        if (reader->traceStart() >= 0)
+            d->traceTime->decreaseStartTime(reader->traceStart());
+        if (reader->traceEnd() >= 0)
+            d->traceTime->increaseEndTime(reader->traceEnd());
         setRecordedFeatures(reader->loadedFeatures());
         delete reader;
         acquiringDone();
diff --git a/src/plugins/qmlprofiler/qmlprofilermodelmanager.h b/src/plugins/qmlprofiler/qmlprofilermodelmanager.h
index 6da39ed93b4..f09537667e5 100644
--- a/src/plugins/qmlprofiler/qmlprofilermodelmanager.h
+++ b/src/plugins/qmlprofiler/qmlprofilermodelmanager.h
@@ -58,7 +58,7 @@ public:
 
     void clear();
 
-    void setTime(qint64 startTime, qint64 endTime);
+    void update(qint64 time);
     void decreaseStartTime(qint64 time);
     void increaseEndTime(qint64 time);
     void restrictToRange(qint64 startTime, qint64 endTime);
diff --git a/src/plugins/qmlprofiler/qmlprofilertraceclient.cpp b/src/plugins/qmlprofiler/qmlprofilertraceclient.cpp
index 0ed31a2036b..39cdb96ede0 100644
--- a/src/plugins/qmlprofiler/qmlprofilertraceclient.cpp
+++ b/src/plugins/qmlprofiler/qmlprofilertraceclient.cpp
@@ -247,7 +247,7 @@ void QmlProfilerTraceClient::setRequestedFeatures(quint64 features)
                        const QmlDebug::QDebugContextInfo &context)
         {
             d->updateFeatures(ProfileDebugMessages);
-            d->currentEvent.event.setTimestamp(context.timestamp);
+            d->currentEvent.event.setTimestamp(context.timestamp > 0 ? context.timestamp : 0);
             d->currentEvent.event.setTypeIndex(-1);
             d->currentEvent.event.setString(text);
             d->currentEvent.type = QmlEventType(DebugMessage, MaximumRangeType, type,
diff --git a/src/plugins/qmlprofiler/qmlprofilertracefile.cpp b/src/plugins/qmlprofiler/qmlprofilertracefile.cpp
index b84de415ae7..710461b6565 100644
--- a/src/plugins/qmlprofiler/qmlprofilertracefile.cpp
+++ b/src/plugins/qmlprofiler/qmlprofilertracefile.cpp
@@ -257,6 +257,8 @@ void QmlProfilerFileReader::loadQzt(QIODevice *device)
                     return;
                 }
                 m_loadedFeatures |= (1ULL << m_eventTypes[event.typeIndex()].feature());
+                if (event.timestamp() < 0)
+                    event.setTimestamp(0);
             } else if (bufferStream.status() == QDataStream::ReadPastEnd) {
                 break; // Apparently EOF is a character so we end up here after the last event.
             } else if (bufferStream.status() == QDataStream::ReadCorruptData) {
@@ -506,15 +508,16 @@ void QmlProfilerFileReader::loadEvents(QXmlStreamReader &stream)
                     continue;
                 }
 
-                event.setTimestamp(attributes.value(_("startTime")).toLongLong());
+                const qint64 timestamp = attributes.value(_("startTime")).toLongLong();
+                event.setTimestamp(timestamp > 0 ? timestamp : 0);
                 event.setTypeIndex(attributes.value(_("eventIndex")).toInt());
 
                 if (attributes.hasAttribute(_("duration"))) {
                     event.setRangeStage(RangeStart);
                     QmlEvent rangeEnd(event);
                     rangeEnd.setRangeStage(RangeEnd);
-                    rangeEnd.setTimestamp(event.timestamp()
-                                          + attributes.value(_("duration")).toLongLong());
+                    const qint64 duration = attributes.value(_("duration")).toLongLong();
+                    rangeEnd.setTimestamp(event.timestamp() + (duration > 0 ? duration : 0));
                     events.addRange(event, rangeEnd);
                 } else {
                     // attributes for special events
diff --git a/src/plugins/qmlprofiler/qmltypedevent.cpp b/src/plugins/qmlprofiler/qmltypedevent.cpp
index e5007345b5f..58d7aae8d75 100644
--- a/src/plugins/qmlprofiler/qmltypedevent.cpp
+++ b/src/plugins/qmlprofiler/qmltypedevent.cpp
@@ -44,7 +44,7 @@ QDataStream &operator>>(QDataStream &stream, QmlTypedEvent &event)
         subtype = -1;
     }
 
-    event.event.setTimestamp(time);
+    event.event.setTimestamp(time > 0 ? time : 0);
     event.event.setTypeIndex(-1);
     event.serverTypeId = 0;
 
diff --git a/src/plugins/qmlprofiler/tests/pixmapcachemodel_test.cpp b/src/plugins/qmlprofiler/tests/pixmapcachemodel_test.cpp
index 0b4d39fdc61..903e2b13320 100644
--- a/src/plugins/qmlprofiler/tests/pixmapcachemodel_test.cpp
+++ b/src/plugins/qmlprofiler/tests/pixmapcachemodel_test.cpp
@@ -38,7 +38,8 @@ PixmapCacheModelTest::PixmapCacheModelTest(QObject *parent) : QObject(parent),
 void PixmapCacheModelTest::initTestCase()
 {
     manager.startAcquiring();
-    manager.traceTime()->setTime(1, 300);
+    manager.traceTime()->decreaseStartTime(1);
+    manager.traceTime()->increaseEndTime(300);
 
     for (int i = 0; i < MaximumPixmapEventType; ++i) {
         eventTypeIndices[i] = manager.numLoadedEventTypes();