diff --git a/src/corelib/time/qdatetime.cpp b/src/corelib/time/qdatetime.cpp
index 2e4757b5255..248fd1d5cef 100644
--- a/src/corelib/time/qdatetime.cpp
+++ b/src/corelib/time/qdatetime.cpp
@@ -4608,6 +4608,10 @@ QDateTime QDateTime::fromMSecsSinceEpoch(qint64 msecs, Qt::TimeSpec spec, int of
 */
 QDateTime QDateTime::fromSecsSinceEpoch(qint64 secs, Qt::TimeSpec spec, int offsetSeconds)
 {
+    constexpr qint64 maxSeconds = std::numeric_limits<qint64>::max() / 1000;
+    constexpr qint64 minSeconds = std::numeric_limits<qint64>::min() / 1000;
+    if (secs > maxSeconds || secs < minSeconds)
+        return QDateTime(); // Would {und,ov}erflow
     return fromMSecsSinceEpoch(secs * 1000, spec, offsetSeconds);
 }
 
@@ -4641,6 +4645,10 @@ QDateTime QDateTime::fromMSecsSinceEpoch(qint64 msecs, const QTimeZone &timeZone
 */
 QDateTime QDateTime::fromSecsSinceEpoch(qint64 secs, const QTimeZone &timeZone)
 {
+    constexpr qint64 maxSeconds = std::numeric_limits<qint64>::max() / 1000;
+    constexpr qint64 minSeconds = std::numeric_limits<qint64>::min() / 1000;
+    if (secs > maxSeconds || secs < minSeconds)
+        return QDateTime(); // Would {und,ov}erflow
     return fromMSecsSinceEpoch(secs * 1000, timeZone);
 }
 #endif
diff --git a/tests/auto/corelib/time/qdatetime/tst_qdatetime.cpp b/tests/auto/corelib/time/qdatetime/tst_qdatetime.cpp
index 2e454605441..bf845085227 100644
--- a/tests/auto/corelib/time/qdatetime/tst_qdatetime.cpp
+++ b/tests/auto/corelib/time/qdatetime/tst_qdatetime.cpp
@@ -73,6 +73,7 @@ private slots:
     void setSecsSinceEpoch();
     void setMSecsSinceEpoch_data();
     void setMSecsSinceEpoch();
+    void fromSecsSinceEpoch();
     void fromMSecsSinceEpoch_data();
     void fromMSecsSinceEpoch();
     void toString_isoDate_data();
@@ -790,6 +791,36 @@ void tst_QDateTime::fromMSecsSinceEpoch()
     QCOMPARE(dtOffset, reference.addMSecs(msecs));
 }
 
+void tst_QDateTime::fromSecsSinceEpoch()
+{
+    const qint64 maxSeconds = std::numeric_limits<qint64>::max() / 1000;
+
+    QVERIFY(QDateTime::fromSecsSinceEpoch(maxSeconds).isValid());
+    QVERIFY(!QDateTime::fromSecsSinceEpoch(maxSeconds + 1).isValid());
+    QVERIFY(QDateTime::fromSecsSinceEpoch(-maxSeconds).isValid());
+    QVERIFY(!QDateTime::fromSecsSinceEpoch(-maxSeconds - 1).isValid());
+
+    QVERIFY(QDateTime::fromSecsSinceEpoch(maxSeconds, Qt::UTC).isValid());
+    QVERIFY(!QDateTime::fromSecsSinceEpoch(maxSeconds + 1, Qt::UTC).isValid());
+    QVERIFY(QDateTime::fromSecsSinceEpoch(-maxSeconds, Qt::UTC).isValid());
+    QVERIFY(!QDateTime::fromSecsSinceEpoch(-maxSeconds - 1, Qt::UTC).isValid());
+
+    // Use an offset for which .toUTC()'s return would flip the validity:
+    QVERIFY(QDateTime::fromSecsSinceEpoch(maxSeconds, Qt::OffsetFromUTC, 7200).isValid());
+    QVERIFY(!QDateTime::fromSecsSinceEpoch(maxSeconds + 1, Qt::OffsetFromUTC, -7200).isValid());
+    QVERIFY(QDateTime::fromSecsSinceEpoch(-maxSeconds, Qt::OffsetFromUTC, -7200).isValid());
+    QVERIFY(!QDateTime::fromSecsSinceEpoch(-maxSeconds - 1, Qt::OffsetFromUTC, 7200).isValid());
+
+#if QT_CONFIG(timezone)
+    // As for offset, use zones each side of UTC:
+    const QTimeZone west("UTC-02:00"), east("UTC+02:00");
+    QVERIFY(QDateTime::fromSecsSinceEpoch(maxSeconds, east).isValid());
+    QVERIFY(!QDateTime::fromSecsSinceEpoch(maxSeconds + 1, west).isValid());
+    QVERIFY(QDateTime::fromSecsSinceEpoch(-maxSeconds, west).isValid());
+    QVERIFY(!QDateTime::fromSecsSinceEpoch(-maxSeconds - 1, east).isValid());
+#endif // timezone
+}
+
 void tst_QDateTime::toString_isoDate_data()
 {
     QTest::addColumn<QDateTime>("datetime");