diff --git a/examples/stockchart/Plot.cpp b/examples/stockchart/Plot.cpp
index f2b76b0..9b7a980 100644
--- a/examples/stockchart/Plot.cpp
+++ b/examples/stockchart/Plot.cpp
@@ -58,8 +58,8 @@ namespace
     class DateScaleDraw : public QwtDateScaleDraw
     {
       public:
-        DateScaleDraw( Qt::TimeSpec timeSpec )
-            : QwtDateScaleDraw( timeSpec )
+        DateScaleDraw( QTimeZone timeZone )
+            : QwtDateScaleDraw( timeZone )
         {
             // as we have dates from 2010 only we use
             // format strings without the year
@@ -98,8 +98,8 @@ namespace
 
         void setInterval( const QDate& date1, const QDate& date2 )
         {
-            const QDateTime dt1( date1, QTime(), Qt::UTC );
-            const QDateTime dt2( date2, QTime(), Qt::UTC );
+            const QDateTime dt1( date1, QTime(), QTimeZone::UTC );
+            const QDateTime dt2( date2, QTime(), QTimeZone::UTC );
 
             QwtPlotZoneItem::setInterval( QwtDate::toDouble( dt1 ),
                 QwtDate::toDouble( dt2 ) );
@@ -112,8 +112,8 @@ Plot::Plot( QWidget* parent )
 {
     setTitle( "Trading Chart" );
 
-    QwtDateScaleDraw* scaleDraw = new DateScaleDraw( Qt::UTC );
-    QwtDateScaleEngine* scaleEngine = new QwtDateScaleEngine( Qt::UTC );
+    QwtDateScaleDraw* scaleDraw = new DateScaleDraw( QTimeZone::UTC );
+    QwtDateScaleEngine* scaleEngine = new QwtDateScaleEngine( QTimeZone::UTC );
 
     setAxisTitle( QwtAxis::XBottom, QString( "2010" ) );
     setAxisScaleDraw( QwtAxis::XBottom, scaleDraw );
diff --git a/examples/stockchart/QuoteFactory.cpp b/examples/stockchart/QuoteFactory.cpp
index bbcc453..2483f59 100644
--- a/examples/stockchart/QuoteFactory.cpp
+++ b/examples/stockchart/QuoteFactory.cpp
@@ -833,7 +833,7 @@ QVector< QwtOHLCSample > QuoteFactory::samples2010( Stock stock )
     QVector< QwtOHLCSample > samples;
     samples.reserve( numSamples );
 
-    QDateTime year2010( QDate( 2010, 1, 1 ), QTime( 0, 0 ), Qt::UTC );
+    QDateTime year2010( QDate( 2010, 1, 1 ), QTime( 0, 0 ), QTimeZone::UTC );
 
     for ( int i = 0; i < numSamples; i++ )
     {
diff --git a/playground/timescale/MainWindow.cpp b/playground/timescale/MainWindow.cpp
index 54e82ac..fb76423 100644
--- a/playground/timescale/MainWindow.cpp
+++ b/playground/timescale/MainWindow.cpp
@@ -58,8 +58,8 @@ void MainWindow::updatePanel()
     const QwtScaleDiv scaleDiv = m_plot->axisScaleDiv( QwtAxis::YLeft );
 
     Settings settings = m_panel->settings();
-    settings.startDateTime = QwtDate::toDateTime( scaleDiv.lowerBound(), Qt::LocalTime );
-    settings.endDateTime = QwtDate::toDateTime( scaleDiv.upperBound(), Qt::LocalTime );
+    settings.startDateTime = QwtDate::toDateTime( scaleDiv.lowerBound(), QTimeZone::LocalTime );
+    settings.endDateTime = QwtDate::toDateTime( scaleDiv.upperBound(), QTimeZone::LocalTime );
 
     m_panel->setSettings( settings );
 }
diff --git a/playground/timescale/Plot.cpp b/playground/timescale/Plot.cpp
index beb5e56..ba744ea 100644
--- a/playground/timescale/Plot.cpp
+++ b/playground/timescale/Plot.cpp
@@ -23,9 +23,9 @@ Plot::Plot( QWidget* parent )
 
     plotLayout()->setAlignCanvasToScales( true );
 
-    initAxis( QwtAxis::YLeft, "Local Time", Qt::LocalTime );
+    initAxis( QwtAxis::YLeft, "Local Time", QTimeZone::LocalTime );
     initAxis( QwtAxis::YRight,
-        "Coordinated Universal Time ( UTC )", Qt::UTC );
+        "Coordinated Universal Time ( UTC )", QTimeZone::UTC );
 
     QwtPlotPanner* panner = new QwtPlotPanner( canvas() );
     QwtPlotMagnifier* magnifier = new QwtPlotMagnifier( canvas() );
@@ -51,12 +51,12 @@ Plot::Plot( QWidget* parent )
 }
 
 void Plot::initAxis( int axis,
-    const QString& title, Qt::TimeSpec timeSpec )
+    const QString& title, QTimeZone timeZone )
 {
     setAxisTitle( axis, title );
 
-    QwtDateScaleDraw* scaleDraw = new QwtDateScaleDraw( timeSpec );
-    QwtDateScaleEngine* scaleEngine = new QwtDateScaleEngine( timeSpec );
+    QwtDateScaleDraw* scaleDraw = new QwtDateScaleDraw( timeZone );
+    QwtDateScaleEngine* scaleEngine = new QwtDateScaleEngine( timeZone );
 
 #if 0
     if ( timeSpec == Qt::LocalTime )
diff --git a/playground/timescale/Plot.h b/playground/timescale/Plot.h
index 67774e6..ea14d94 100644
--- a/playground/timescale/Plot.h
+++ b/playground/timescale/Plot.h
@@ -6,6 +6,7 @@
 #pragma once
 
 #include <QwtPlot>
+#include <QTimeZone>
 
 class Settings;
 
@@ -20,6 +21,6 @@ class Plot : public QwtPlot
     void applySettings( const Settings& );
 
   private:
-    void initAxis( int axis, const QString& title, Qt::TimeSpec );
+    void initAxis( int axis, const QString& title, QTimeZone );
     void applyAxisSettings( int axis, const Settings& );
 };