diff --git a/src/corelib/time/qdatetime.cpp b/src/corelib/time/qdatetime.cpp
index d1b07df07d..3651aaa9d7 100644
--- a/src/corelib/time/qdatetime.cpp
+++ b/src/corelib/time/qdatetime.cpp
@@ -1555,14 +1555,14 @@ qint64 QDate::daysTo(QDate d) const
 
 
 /*!
-    \fn bool QDate::operator==(QDate lhs, QDate rhs)
+    \fn bool QDate::operator==(const QDate &lhs, const QDate &rhs)
 
     Returns \c true if \a lhs and \a rhs represent the same day, otherwise
     \c false.
 */
 
 /*!
-    \fn bool QDate::operator!=(QDate lhs, QDate rhs)
+    \fn bool QDate::operator!=(const QDate &lhs, const QDate &rhs)
 
     Returns \c true if \a lhs and \a rhs represent distinct days; otherwise
     returns \c false.
@@ -1571,26 +1571,26 @@ qint64 QDate::daysTo(QDate d) const
 */
 
 /*!
-    \fn bool QDate::operator<(QDate lhs, QDate rhs)
+    \fn bool QDate::operator<(const QDate &lhs, const QDate &rhs)
 
     Returns \c true if \a lhs is earlier than \a rhs; otherwise returns \c false.
 */
 
 /*!
-    \fn bool QDate::operator<=(QDate lhs, QDate rhs)
+    \fn bool QDate::operator<=(const QDate &lhs, const QDate &rhs)
 
     Returns \c true if \a lhs is earlier than or equal to \a rhs;
     otherwise returns \c false.
 */
 
 /*!
-    \fn bool QDate::operator>(QDate lhs, QDate rhs)
+    \fn bool QDate::operator>(const QDate &lhs, const QDate &rhs)
 
     Returns \c true if \a lhs is later than \a rhs; otherwise returns \c false.
 */
 
 /*!
-    \fn bool QDate::operator>=(QDate lhs, QDate rhs)
+    \fn bool QDate::operator>=(const QDate &lhs, const QDate &rhs)
 
     Returns \c true if \a lhs is later than or equal to \a rhs;
     otherwise returns \c false.
diff --git a/src/corelib/time/qdatetime.h b/src/corelib/time/qdatetime.h
index bbfc0ec9fc..6183daa5a1 100644
--- a/src/corelib/time/qdatetime.h
+++ b/src/corelib/time/qdatetime.h
@@ -6,6 +6,7 @@
 #define QDATETIME_H
 
 #include <QtCore/qcalendar.h>
+#include <QtCore/qcompare.h>
 #include <QtCore/qnamespace.h>
 #include <QtCore/qshareddata.h>
 #include <QtCore/qstring.h>
@@ -170,12 +171,13 @@ private:
     friend class QDateTime;
     friend class QDateTimePrivate;
 
-    friend constexpr bool operator==(QDate lhs, QDate rhs) { return lhs.jd == rhs.jd; }
-    friend constexpr bool operator!=(QDate lhs, QDate rhs) { return lhs.jd != rhs.jd; }
-    friend constexpr bool operator< (QDate lhs, QDate rhs) { return lhs.jd <  rhs.jd; }
-    friend constexpr bool operator<=(QDate lhs, QDate rhs) { return lhs.jd <= rhs.jd; }
-    friend constexpr bool operator> (QDate lhs, QDate rhs) { return lhs.jd >  rhs.jd; }
-    friend constexpr bool operator>=(QDate lhs, QDate rhs) { return lhs.jd >= rhs.jd; }
+    friend constexpr bool comparesEqual(const QDate &lhs, const QDate &rhs) noexcept
+    { return lhs.jd == rhs.jd; }
+    friend constexpr Qt::strong_ordering
+    compareThreeWay(const QDate &lhs, const QDate &rhs) noexcept
+    { return Qt::compareThreeWay(lhs.jd, rhs.jd); }
+    Q_DECLARE_STRONGLY_ORDERED_LITERAL_TYPE(QDate)
+
 #ifndef QT_NO_DATASTREAM
     friend Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, QDate);
     friend Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QDate &);