diff --git a/src/network/access/qhttpheaders.cpp b/src/network/access/qhttpheaders.cpp
index 3786a17ae23..8f662c59a68 100644
--- a/src/network/access/qhttpheaders.cpp
+++ b/src/network/access/qhttpheaders.cpp
@@ -1545,6 +1545,34 @@ std::optional<QDateTime> QHttpHeaders::dateTimeValue(WellKnownHeader name) const
     return dateTimeValue(wellKnownHeaderName(name));
 }
 
+/*!
+    \since 6.10
+
+    Sets the value of the header name \a name to \a dateTime,
+    following the
+    \l {https://datatracker.ietf.org/doc/html/rfc9110#name-date-time-formats}{standard HTTP IMF-fixdate format}.
+    If the header does not exist, adds a new one.
+
+    \sa dateTimeValue(QAnyStringView name), dateTimeValueAt(qsizetype i)
+ */
+void QHttpHeaders::setDateTimeValue(QAnyStringView name, const QDateTime &dateTime)
+{
+    if (!dateTime.isValid()) {
+        qWarning("QHttpHeaders::setDateTimeValue: invalid QDateTime value received");
+        return;
+    }
+    replaceOrAppend(name, QNetworkHeadersPrivate::toHttpDate(dateTime));
+}
+
+/*!
+    \since 6.10
+    \overload setDateTimeValue(QAnyStringView)
+*/
+void QHttpHeaders::setDateTimeValue(WellKnownHeader name, const QDateTime &dateTime)
+{
+    setDateTimeValue(wellKnownHeaderName(name), dateTime);
+}
+
 /*!
     \since 6.10
 
diff --git a/src/network/access/qhttpheaders.h b/src/network/access/qhttpheaders.h
index c9087724a64..23de782662d 100644
--- a/src/network/access/qhttpheaders.h
+++ b/src/network/access/qhttpheaders.h
@@ -262,6 +262,9 @@ public:
 
     Q_NETWORK_EXPORT std::optional<QDateTime> dateTimeValueAt(qsizetype i) const;
 
+    Q_NETWORK_EXPORT void setDateTimeValue(QAnyStringView name, const QDateTime &dateTime);
+    Q_NETWORK_EXPORT void setDateTimeValue(WellKnownHeader name, const QDateTime &dateTime);
+
     Q_NETWORK_EXPORT qsizetype size() const noexcept;
     Q_NETWORK_EXPORT void reserve(qsizetype size);
     bool isEmpty() const noexcept { return size() == 0; }
diff --git a/tests/auto/network/access/qhttpheaders/tst_qhttpheaders.cpp b/tests/auto/network/access/qhttpheaders/tst_qhttpheaders.cpp
index dc21bf2dab3..e0b76308dfa 100644
--- a/tests/auto/network/access/qhttpheaders/tst_qhttpheaders.cpp
+++ b/tests/auto/network/access/qhttpheaders/tst_qhttpheaders.cpp
@@ -623,6 +623,14 @@ void tst_QHttpHeaders::dateTimeValues()
     QCOMPARE(dateTimeValueAtIndex->date(), QDate(2025, 2, 24));
     QCOMPARE(dateTimeValueAtIndex->time(), QTime(11, 11, 11, 0));
 
+    QDateTime dateTimeValue3{QDate{2049, 4, 3}, QTime{12, 30, 00, 0}};
+    dateTimeValue3.setTimeZone(QTimeZone::UTC);
+    h1.setDateTimeValue("date", dateTimeValue3);
+    std::optional<QDateTime> setDateTimeValue = h1.dateTimeValue("date");
+    QVERIFY(setDateTimeValue);
+    QCOMPARE(setDateTimeValue->date(), QDate(2049, 4, 3));
+    QCOMPARE(setDateTimeValue->time(), QTime(12, 30, 00, 0));
+
     h1.clear();
     h1.append("Date", "InvalidDateFormat");
     h1.append("Date", "");