diff --git a/src/corelib/time/qtimezoneprivate_p.h b/src/corelib/time/qtimezoneprivate_p.h
index 484bbe56eb..a436c87999 100644
--- a/src/corelib/time/qtimezoneprivate_p.h
+++ b/src/corelib/time/qtimezoneprivate_p.h
@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2021 The Qt Company Ltd.
+** Copyright (C) 2022 The Qt Company Ltd.
 ** Copyright (C) 2013 John Layt <jlayt@kde.org>
 ** Contact: https://www.qt.io/licensing/
 **
@@ -455,10 +455,11 @@ public:
 
     QList<QByteArray> availableTimeZoneIds() const override;
 
-private:
-    void init(const QByteArray &ianaId);
+    // For use within implementation's TransitionTimePair:
     QTimeZonePrivate::Data ruleToData(const QWinTransitionRule &rule, qint64 atMSecsSinceEpoch,
                                       QTimeZone::TimeType type, bool fakeDst = false) const;
+private:
+    void init(const QByteArray &ianaId);
 
     QByteArray m_windowsId;
     QString m_displayName;
diff --git a/src/corelib/time/qtimezoneprivate_win.cpp b/src/corelib/time/qtimezoneprivate_win.cpp
index eda46f8b9b..9f65ca8d01 100644
--- a/src/corelib/time/qtimezoneprivate_win.cpp
+++ b/src/corelib/time/qtimezoneprivate_win.cpp
@@ -388,6 +388,21 @@ struct TransitionTimePair
         return std == QTimeZonePrivate::invalidMSecs()
             || dst == QTimeZonePrivate::invalidMSecs();
     }
+
+    bool startsInDst() const
+    {
+        // Year starts in daylightTimeRule iff it has a valid transition out of
+        // DST before it has a transition into it.
+        return std != QTimeZonePrivate::invalidMSecs() && std < dst;
+    }
+
+    QTimeZonePrivate::Data ruleToData(const QWinTimeZonePrivate::QWinTransitionRule &rule,
+                                      const QWinTimeZonePrivate *tzp, bool isDst) const
+    {
+        if (isDst)
+            return tzp->ruleToData(rule, dst, QTimeZone::DaylightTime, fakesDst());
+        return tzp->ruleToData(rule, std, QTimeZone::StandardTime, fakesDst());
+    }
 };
 
 int yearEndOffset(const QWinTimeZonePrivate::QWinTransitionRule &rule, int year)
@@ -676,11 +691,7 @@ QTimeZonePrivate::Data QWinTimeZonePrivate::nextTransition(qint64 afterMSecsSinc
                 // Find first transition in this first rule.
                 // Initial guess: first rule starts in standard time.
                 TransitionTimePair pair(rule, rule.startYear, rule.standardTimeBias);
-                // Year starts in daylightTimeRule iff it has a valid transition
-                // out of DST before it has a transition into it.
-                if (pair.std != invalidMSecs() && pair.std < pair.dst)
-                    return ruleToData(rule, pair.dst, QTimeZone::DaylightTime, pair.fakesDst());
-                return ruleToData(rule, pair.std, QTimeZone::StandardTime, pair.fakesDst());
+                return pair.ruleToData(rule, this, pair.startsInDst());
             }
             const int endYear = ruleIndex + 1 < m_tranRules.count()
                 ? qMin(m_tranRules.at(ruleIndex + 1).startYear, year + 2) : (year + 2);
@@ -706,9 +717,7 @@ QTimeZonePrivate::Data QWinTimeZonePrivate::nextTransition(qint64 afterMSecsSinc
                     continue;
                 }
 
-                if (isDst)
-                    return ruleToData(rule, pair.dst, QTimeZone::DaylightTime, pair.fakesDst());
-                return ruleToData(rule, pair.std, QTimeZone::StandardTime, pair.fakesDst());
+                return pair.ruleToData(rule, this, isDst);
             }
             // Fell off end of rule, try next rule.
         } // else: no transition during rule's period
@@ -746,9 +755,7 @@ QTimeZonePrivate::Data QWinTimeZonePrivate::previousTransition(qint64 beforeMSec
                     prior = year == 1 ? -1 : year - 1; // No year 0.
                     continue;
                 }
-                if (isDst)
-                    return ruleToData(rule, pair.dst, QTimeZone::DaylightTime, pair.fakesDst());
-                return ruleToData(rule, pair.std, QTimeZone::StandardTime, pair.fakesDst());
+                return pair.ruleToData(rule, this, isDst);
             }
             // Fell off start of rule, try previous rule.
         } else if (ruleIndex == 0) {