diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
index e63ffdfb36f..dc1182a847f 100644
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -262,7 +262,7 @@ void BitcoinApplication::createWindow(const NetworkStyle *networkStyle)
 void BitcoinApplication::createSplashScreen(const NetworkStyle *networkStyle)
 {
     assert(!m_splash);
-    m_splash = new SplashScreen(nullptr, networkStyle);
+    m_splash = new SplashScreen(networkStyle);
     // We don't hold a direct pointer to the splash screen after creation, but the splash
     // screen will take care of deleting itself when finish() happens.
     m_splash->show();
diff --git a/src/qt/bitcoingui.cpp b/src/qt/bitcoingui.cpp
index 8935ff19bf9..07254fdbea8 100644
--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -1305,7 +1305,7 @@ void BitcoinGUI::updateProxyIcon()
     bool proxy_enabled = clientModel->getProxyInfo(ip_port);
 
     if (proxy_enabled) {
-        if (labelProxyIcon->pixmap() == nullptr) {
+        if (!GUIUtil::HasPixmap(labelProxyIcon)) {
             QString ip_port_q = QString::fromStdString(ip_port);
             labelProxyIcon->setPixmap(platformStyle->SingleColorIcon(":/icons/proxy").pixmap(STATUSBAR_ICONSIZE, STATUSBAR_ICONSIZE));
             labelProxyIcon->setToolTip(tr("Proxy is <b>enabled</b>: %1").arg(ip_port_q));
diff --git a/src/qt/bitcoingui.h b/src/qt/bitcoingui.h
index 4c55f286932..c615bd63fca 100644
--- a/src/qt/bitcoingui.h
+++ b/src/qt/bitcoingui.h
@@ -49,6 +49,7 @@ struct BlockAndHeaderTipInfo;
 QT_BEGIN_NAMESPACE
 class QAction;
 class QComboBox;
+class QDateTime;
 class QMenu;
 class QProgressBar;
 class QProgressDialog;
diff --git a/src/qt/guiutil.cpp b/src/qt/guiutil.cpp
index bab17562a60..70e76f765bf 100644
--- a/src/qt/guiutil.cpp
+++ b/src/qt/guiutil.cpp
@@ -920,4 +920,35 @@ void PopupMenu(QMenu* menu, const QPoint& point, QAction* at_action)
     menu->popup(point, at_action);
 }
 
+QDateTime StartOfDay(const QDate& date)
+{
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
+    return date.startOfDay();
+#else
+    return QDateTime(date);
+#endif
+}
+
+bool HasPixmap(const QLabel* label)
+{
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
+    return !label->pixmap(Qt::ReturnByValue).isNull();
+#else
+    return label->pixmap() != nullptr;
+#endif
+}
+
+QImage GetImage(const QLabel* label)
+{
+    if (!HasPixmap(label)) {
+        return QImage();
+    }
+
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
+    return label->pixmap(Qt::ReturnByValue).toImage();
+#else
+    return label->pixmap()->toImage();
+#endif
+}
+
 } // namespace GUIUtil
diff --git a/src/qt/guiutil.h b/src/qt/guiutil.h
index 2bd94b5eb34..c976b4b4bb0 100644
--- a/src/qt/guiutil.h
+++ b/src/qt/guiutil.h
@@ -289,7 +289,7 @@ namespace GUIUtil
     /**
      * Returns the distance in pixels appropriate for drawing a subsequent character after text.
      *
-     * In Qt 5.12 and before the QFontMetrics::width() is used and it is deprecated since Qt 13.0.
+     * In Qt 5.12 and before the QFontMetrics::width() is used and it is deprecated since Qt 5.13.
      * In Qt 5.11 the QFontMetrics::horizontalAdvance() was introduced.
      */
     int TextWidth(const QFontMetrics& fm, const QString& text);
@@ -303,6 +303,44 @@ namespace GUIUtil
      * Call QMenu::popup() only on supported QT_QPA_PLATFORM.
      */
     void PopupMenu(QMenu* menu, const QPoint& point, QAction* at_action = nullptr);
+
+    /**
+     * Returns the start-moment of the day in local time.
+     *
+     * QDateTime::QDateTime(const QDate& date) is deprecated since Qt 5.15.
+     * QDate::startOfDay() was introduced in Qt 5.14.
+     */
+    QDateTime StartOfDay(const QDate& date);
+
+    /**
+     * Returns true if pixmap has been set.
+     *
+     * QPixmap* QLabel::pixmap() is deprecated since Qt 5.15.
+     */
+    bool HasPixmap(const QLabel* label);
+    QImage GetImage(const QLabel* label);
+
+    /**
+     * Splits the string into substrings wherever separator occurs, and returns
+     * the list of those strings. Empty strings do not appear in the result.
+     *
+     * QString::split() signature differs in different Qt versions:
+     *  - QString::SplitBehavior is deprecated since Qt 5.15
+     *  - Qt::SplitBehavior was introduced in Qt 5.14
+     * If {QString|Qt}::SkipEmptyParts behavior is required, use this
+     * function instead of QString::split().
+     */
+    template <typename SeparatorType>
+    QStringList SplitSkipEmptyParts(const QString& string, const SeparatorType& separator)
+    {
+    #if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
+        return string.split(separator, Qt::SkipEmptyParts);
+    #else
+        return string.split(separator, QString::SkipEmptyParts);
+    #endif
+    }
+
+
 } // namespace GUIUtil
 
 #endif // BITCOIN_QT_GUIUTIL_H
diff --git a/src/qt/optionsmodel.cpp b/src/qt/optionsmodel.cpp
index 7e089b4f955..1603b12a73b 100644
--- a/src/qt/optionsmodel.cpp
+++ b/src/qt/optionsmodel.cpp
@@ -219,7 +219,7 @@ static ProxySetting GetProxySetting(QSettings &settings, const QString &name)
         return default_val;
     }
     // contains IP at index 0 and port at index 1
-    QStringList ip_port = settings.value(name).toString().split(":", QString::SkipEmptyParts);
+    QStringList ip_port = GUIUtil::SplitSkipEmptyParts(settings.value(name).toString(), ":");
     if (ip_port.size() == 2) {
         return {true, ip_port.at(0), ip_port.at(1)};
     } else { // Invalid: return default
diff --git a/src/qt/overviewpage.cpp b/src/qt/overviewpage.cpp
index b536567c8b5..1297eb8b755 100644
--- a/src/qt/overviewpage.cpp
+++ b/src/qt/overviewpage.cpp
@@ -17,6 +17,7 @@
 
 #include <QAbstractItemDelegate>
 #include <QApplication>
+#include <QDateTime>
 #include <QPainter>
 #include <QStatusTipEvent>
 
diff --git a/src/qt/paymentserver.cpp b/src/qt/paymentserver.cpp
index 8679ced685e..71eb37985bc 100644
--- a/src/qt/paymentserver.cpp
+++ b/src/qt/paymentserver.cpp
@@ -26,7 +26,6 @@
 #include <QApplication>
 #include <QByteArray>
 #include <QDataStream>
-#include <QDateTime>
 #include <QDebug>
 #include <QFile>
 #include <QFileOpenEvent>
diff --git a/src/qt/qrimagewidget.cpp b/src/qt/qrimagewidget.cpp
index c816e1f8ed0..5dc4d58f86e 100644
--- a/src/qt/qrimagewidget.cpp
+++ b/src/qt/qrimagewidget.cpp
@@ -95,15 +95,12 @@ bool QRImageWidget::setQR(const QString& data, const QString& text)
 
 QImage QRImageWidget::exportImage()
 {
-    if(!pixmap())
-        return QImage();
-    return pixmap()->toImage();
+    return GUIUtil::GetImage(this);
 }
 
 void QRImageWidget::mousePressEvent(QMouseEvent *event)
 {
-    if(event->button() == Qt::LeftButton && pixmap())
-    {
+    if (event->button() == Qt::LeftButton && GUIUtil::HasPixmap(this)) {
         event->accept();
         QMimeData *mimeData = new QMimeData;
         mimeData->setImageData(exportImage());
@@ -118,7 +115,7 @@ void QRImageWidget::mousePressEvent(QMouseEvent *event)
 
 void QRImageWidget::saveImage()
 {
-    if(!pixmap())
+    if (!GUIUtil::HasPixmap(this))
         return;
     QString fn = GUIUtil::getSaveFileName(this, tr("Save QR Code"), QString(), tr("PNG Image (*.png)"), nullptr);
     if (!fn.isEmpty())
@@ -129,14 +126,14 @@ void QRImageWidget::saveImage()
 
 void QRImageWidget::copyImage()
 {
-    if(!pixmap())
+    if (!GUIUtil::HasPixmap(this))
         return;
     QApplication::clipboard()->setImage(exportImage());
 }
 
 void QRImageWidget::contextMenuEvent(QContextMenuEvent *event)
 {
-    if(!pixmap())
+    if (!GUIUtil::HasPixmap(this))
         return;
     contextMenu->exec(event->globalPos());
 }
diff --git a/src/qt/rpcconsole.cpp b/src/qt/rpcconsole.cpp
index a14fae6460c..01db782e0dc 100644
--- a/src/qt/rpcconsole.cpp
+++ b/src/qt/rpcconsole.cpp
@@ -28,6 +28,7 @@
 #include <wallet/wallet.h>
 #endif
 
+#include <QDateTime>
 #include <QFont>
 #include <QKeyEvent>
 #include <QMenu>
diff --git a/src/qt/rpcconsole.h b/src/qt/rpcconsole.h
index 280c5bd71a9..bce04d02be0 100644
--- a/src/qt/rpcconsole.h
+++ b/src/qt/rpcconsole.h
@@ -28,6 +28,7 @@ namespace Ui {
 }
 
 QT_BEGIN_NAMESPACE
+class QDateTime;
 class QMenu;
 class QItemSelection;
 QT_END_NAMESPACE
diff --git a/src/qt/sendcoinsdialog.cpp b/src/qt/sendcoinsdialog.cpp
index 97fb88d71ca..fe2e71a2b9c 100644
--- a/src/qt/sendcoinsdialog.cpp
+++ b/src/qt/sendcoinsdialog.cpp
@@ -171,8 +171,15 @@ void SendCoinsDialog::setModel(WalletModel *_model)
         }
         connect(ui->confTargetSelector, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged), this, &SendCoinsDialog::updateSmartFeeLabel);
         connect(ui->confTargetSelector, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged), this, &SendCoinsDialog::coinControlUpdateLabels);
+
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
+        connect(ui->groupFee, &QButtonGroup::idClicked, this, &SendCoinsDialog::updateFeeSectionControls);
+        connect(ui->groupFee, &QButtonGroup::idClicked, this, &SendCoinsDialog::coinControlUpdateLabels);
+#else
         connect(ui->groupFee, static_cast<void (QButtonGroup::*)(int)>(&QButtonGroup::buttonClicked), this, &SendCoinsDialog::updateFeeSectionControls);
         connect(ui->groupFee, static_cast<void (QButtonGroup::*)(int)>(&QButtonGroup::buttonClicked), this, &SendCoinsDialog::coinControlUpdateLabels);
+#endif
+
         connect(ui->customFee, &BitcoinAmountField::valueChanged, this, &SendCoinsDialog::coinControlUpdateLabels);
         connect(ui->optInRBF, &QCheckBox::stateChanged, this, &SendCoinsDialog::updateSmartFeeLabel);
         connect(ui->optInRBF, &QCheckBox::stateChanged, this, &SendCoinsDialog::coinControlUpdateLabels);
diff --git a/src/qt/splashscreen.cpp b/src/qt/splashscreen.cpp
index bd63d6e7fb6..b7a3b602cff 100644
--- a/src/qt/splashscreen.cpp
+++ b/src/qt/splashscreen.cpp
@@ -24,8 +24,8 @@
 #include <QScreen>
 
 
-SplashScreen::SplashScreen(Qt::WindowFlags f, const NetworkStyle *networkStyle) :
-    QWidget(nullptr, f), curAlignment(0)
+SplashScreen::SplashScreen(const NetworkStyle* networkStyle)
+    : QWidget(), curAlignment(0)
 {
     // set reference point, paddings
     int paddingRight            = 50;
diff --git a/src/qt/splashscreen.h b/src/qt/splashscreen.h
index 2213b02c55a..fac3a62e0a8 100644
--- a/src/qt/splashscreen.h
+++ b/src/qt/splashscreen.h
@@ -28,7 +28,7 @@ class SplashScreen : public QWidget
     Q_OBJECT
 
 public:
-    explicit SplashScreen(Qt::WindowFlags f, const NetworkStyle *networkStyle);
+    explicit SplashScreen(const NetworkStyle *networkStyle);
     ~SplashScreen();
     void setNode(interfaces::Node& node);
 
diff --git a/src/qt/transactionview.cpp b/src/qt/transactionview.cpp
index 54ecfc38ec7..e14e22e9def 100644
--- a/src/qt/transactionview.cpp
+++ b/src/qt/transactionview.cpp
@@ -237,7 +237,7 @@ void TransactionView::setModel(WalletModel *_model)
         if (_model->getOptionsModel())
         {
             // Add third party transaction URLs to context menu
-            QStringList listUrls = _model->getOptionsModel()->getThirdPartyTxUrls().split("|", QString::SkipEmptyParts);
+            QStringList listUrls = GUIUtil::SplitSkipEmptyParts(_model->getOptionsModel()->getThirdPartyTxUrls(), "|");
             for (int i = 0; i < listUrls.size(); ++i)
             {
                 QString url = listUrls[i].trimmed();
@@ -275,30 +275,30 @@ void TransactionView::chooseDate(int idx)
         break;
     case Today:
         transactionProxyModel->setDateRange(
-                QDateTime(current),
+                GUIUtil::StartOfDay(current),
                 TransactionFilterProxy::MAX_DATE);
         break;
     case ThisWeek: {
         // Find last Monday
         QDate startOfWeek = current.addDays(-(current.dayOfWeek()-1));
         transactionProxyModel->setDateRange(
-                QDateTime(startOfWeek),
+                GUIUtil::StartOfDay(startOfWeek),
                 TransactionFilterProxy::MAX_DATE);
 
         } break;
     case ThisMonth:
         transactionProxyModel->setDateRange(
-                QDateTime(QDate(current.year(), current.month(), 1)),
+                GUIUtil::StartOfDay(QDate(current.year(), current.month(), 1)),
                 TransactionFilterProxy::MAX_DATE);
         break;
     case LastMonth:
         transactionProxyModel->setDateRange(
-                QDateTime(QDate(current.year(), current.month(), 1).addMonths(-1)),
-                QDateTime(QDate(current.year(), current.month(), 1)));
+                GUIUtil::StartOfDay(QDate(current.year(), current.month(), 1).addMonths(-1)),
+                GUIUtil::StartOfDay(QDate(current.year(), current.month(), 1)));
         break;
     case ThisYear:
         transactionProxyModel->setDateRange(
-                QDateTime(QDate(current.year(), 1, 1)),
+                GUIUtil::StartOfDay(QDate(current.year(), 1, 1)),
                 TransactionFilterProxy::MAX_DATE);
         break;
     case Range:
@@ -583,8 +583,8 @@ void TransactionView::dateRangeChanged()
     if(!transactionProxyModel)
         return;
     transactionProxyModel->setDateRange(
-            QDateTime(dateFrom->date()),
-            QDateTime(dateTo->date()).addDays(1));
+            GUIUtil::StartOfDay(dateFrom->date()),
+            GUIUtil::StartOfDay(dateTo->date()).addDays(1));
 }
 
 void TransactionView::focusTransaction(const QModelIndex &idx)