diff --git a/src/corelib/time/qdatetime.cpp b/src/corelib/time/qdatetime.cpp
index d69101a0d1..b484196350 100644
--- a/src/corelib/time/qdatetime.cpp
+++ b/src/corelib/time/qdatetime.cpp
@@ -435,6 +435,9 @@ static int fromOffsetString(QStringView offsetString, bool *valid) noexcept
 
 QDate::QDate(int y, int m, int d)
 {
+    static_assert(QDate::maxJd() == JulianDayMax);
+    static_assert(QDate::minJd() == JulianDayMin);
+
     if (!QGregorianCalendar::julianFromParts(y, m, d, &jd))
         jd = nullJd();
 }
diff --git a/src/corelib/time/qdatetime_p.h b/src/corelib/time/qdatetime_p.h
index ab91ec3333..bd4e1e33d0 100644
--- a/src/corelib/time/qdatetime_p.h
+++ b/src/corelib/time/qdatetime_p.h
@@ -122,6 +122,9 @@ constexpr qint64 MSECS_PER_HOUR = SECS_PER_HOUR * MSECS_PER_SEC;
 constexpr qint64 MSECS_PER_DAY = SECS_PER_DAY * MSECS_PER_SEC;
 
 constexpr qint64 JULIAN_DAY_FOR_EPOCH = 2440588; // result of QDate(1970, 1, 1).toJulianDay()
+
+constexpr qint64 JulianDayMax = Q_INT64_C( 784354017364);
+constexpr qint64 JulianDayMin = Q_INT64_C(-784350574879);
 }
 }
 
diff --git a/tests/auto/corelib/time/qdate/tst_qdate.cpp b/tests/auto/corelib/time/qdate/tst_qdate.cpp
index 302f58d00a..32edc20c18 100644
--- a/tests/auto/corelib/time/qdate/tst_qdate.cpp
+++ b/tests/auto/corelib/time/qdate/tst_qdate.cpp
@@ -12,6 +12,8 @@
 #include <private/qglobal_p.h> // for the icu feature test
 #include <private/qdatetime_p.h>
 
+using namespace QtPrivate::DateTimeConstants;
+
 class tst_QDate : public QObject
 {
     Q_OBJECT
@@ -98,8 +100,8 @@ void tst_QDate::isNull_data()
     QTest::addColumn<qint64>("jd");
     QTest::addColumn<bool>("null");
 
-    qint64 minJd = Q_INT64_C(-784350574879);
-    qint64 maxJd = Q_INT64_C( 784354017364);
+    qint64 minJd = JulianDayMin;
+    qint64 maxJd = JulianDayMax;
 
     QTest::newRow("qint64 min") << std::numeric_limits<qint64>::min() << true;
     QTest::newRow("minJd - 1")  << minJd - 1                          << true;
@@ -693,8 +695,8 @@ void tst_QDate::julianDaysLimits()
 {
     qint64 min = std::numeric_limits<qint64>::min();
     qint64 max = std::numeric_limits<qint64>::max();
-    qint64 minJd = Q_INT64_C(-784350574879);
-    qint64 maxJd = Q_INT64_C( 784354017364);
+    qint64 minJd = JulianDayMin;
+    qint64 maxJd = JulianDayMax;
 
     QDate maxDate = QDate::fromJulianDay(maxJd);
     QDate minDate = QDate::fromJulianDay(minJd);
@@ -917,8 +919,8 @@ void tst_QDate::addYears_data()
 
 void tst_QDate::daysTo()
 {
-    qint64 minJd = Q_INT64_C(-784350574879);
-    qint64 maxJd = Q_INT64_C( 784354017364);
+    qint64 minJd = JulianDayMin;
+    qint64 maxJd = JulianDayMax;
 
     QDate dt1(2000, 1, 1);
     QDate dt2(2000, 1, 5);
@@ -1682,8 +1684,8 @@ void tst_QDate::roundtrip() const
         loopDate = loopDate.addDays(1);
     }
 
-    qint64 minJd = Q_INT64_C(-784350574879);
-    qint64 maxJd = Q_INT64_C( 784354017364);
+    qint64 minJd = JulianDayMin;
+    qint64 maxJd = JulianDayMax;
 
     // Test Gregorian round trip at top end of conversion range
     loopDate = QDate::fromJulianDay(maxJd);