diff --git a/autotests/testicalformat.h b/autotests/testicalformat.h
--- a/autotests/testicalformat.h
+++ b/autotests/testicalformat.h
@@ -33,6 +33,7 @@
     void testVolatileProperties();
     void testCuType();
     void testAlarm();
+    void testReadFromString();
 };
 
 #endif
diff --git a/autotests/testicalformat.cpp b/autotests/testicalformat.cpp
--- a/autotests/testicalformat.cpp
+++ b/autotests/testicalformat.cpp
@@ -170,3 +170,42 @@
     Alarm::Ptr alarm2 = event2->alarms()[0];
     QCOMPARE(*alarm, *alarm2);
 }
+
+void ICalFormatTest::testReadFromString()
+{
+    ICalFormat format;
+
+    const QString icsDataWithout
+        = QLatin1String("BEGIN:VCALENDAR\n" \
+                        "PRODID:-//K Desktop Environment//NONSGML libkcal 3.2//EN\n" \
+                        "VERSION:2.0\n" \
+                        "BEGIN:VEVENT\n" \
+                        "UID:123-456-789\n" \
+                        "SUMMARY:Test no created or last modified\n" \
+                        "DTSTART;TZID=Europe/Paris:20200114\n" \
+                        "END:VEVENT\n" \
+                        "END:VCALENDAR");
+    Incidence::Ptr event = format.fromString(icsDataWithout);
+
+    QVERIFY(event);
+    QVERIFY(!event->created().isValid());
+    QVERIFY(!event->lastModified().isValid());
+
+    const QString icsDataWith
+        = QLatin1String("BEGIN:VCALENDAR\n" \
+                        "PRODID:-//K Desktop Environment//NONSGML libkcal 3.2//EN\n" \
+                        "VERSION:2.0\n" \
+                        "BEGIN:VEVENT\n" \
+                        "UID:123-456-789\n" \
+                        "CREATED: 20200114T141312Z\n" \
+                        "LAST-MODIFIED: 20200114T151312Z\n" \
+                        "SUMMARY:Test no created or last modified\n" \
+                        "DTSTART;TZID=Europe/Paris:20200114\n" \
+                        "END:VEVENT\n" \
+                        "END:VCALENDAR");
+    Incidence::Ptr event2 = format.fromString(icsDataWith);
+
+    QVERIFY(event2);
+    QVERIFY(event2->created().isValid());
+    QVERIFY(event2->lastModified().isValid());
+}
diff --git a/src/icalformat_p.cpp b/src/icalformat_p.cpp
--- a/src/icalformat_p.cpp
+++ b/src/icalformat_p.cpp
@@ -1173,6 +1173,8 @@
 Todo::Ptr ICalFormatImpl::readTodo(icalcomponent *vtodo, const ICalTimeZoneCache *tzlist)
 {
     Todo::Ptr todo(new Todo);
+    todo->setCreated(QDateTime());
+    todo->setLastModified(QDateTime());
 
     readIncidence(vtodo, todo, tzlist);
 
@@ -1239,6 +1241,8 @@
 Event::Ptr ICalFormatImpl::readEvent(icalcomponent *vevent, const ICalTimeZoneCache *tzlist)
 {
     Event::Ptr event(new Event);
+    event->setCreated(QDateTime());
+    event->setLastModified(QDateTime());
 
     readIncidence(vevent, event, tzlist);
 
@@ -1404,6 +1408,9 @@
 Journal::Ptr ICalFormatImpl::readJournal(icalcomponent *vjournal, const ICalTimeZoneCache *tzList)
 {
     Journal::Ptr journal(new Journal);
+    journal->setCreated(QDateTime());
+    journal->setLastModified(QDateTime());
+
     readIncidence(vjournal, journal, tzList);
 
     journal->resetDirtyFields();