diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
index 54a2e1160acdeb..ea773505eab3cb 100644
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -254,7 +254,7 @@ void BitcoinApplication::createWindow(const NetworkStyle *networkStyle)
 
 void BitcoinApplication::createSplashScreen(const NetworkStyle *networkStyle)
 {
-    SplashScreen *splash = new SplashScreen(m_node, nullptr, networkStyle);
+    SplashScreen *splash = new SplashScreen(m_node, 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.
     splash->show();
diff --git a/src/qt/bitcoingui.cpp b/src/qt/bitcoingui.cpp
index 641f0b25db166d..5da6234d34e732 100644
--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -1858,7 +1858,7 @@ 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(GUIUtil::getIcon("proxy", GUIUtil::ThemedColor::GREEN).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 372e0a7e4e4b06..7439c9774734c1 100644
--- a/src/qt/bitcoingui.h
+++ b/src/qt/bitcoingui.h
@@ -49,6 +49,7 @@ QT_BEGIN_NAMESPACE
 class QAction;
 class QButtonGroup;
 class QComboBox;
+class QDateTime;
 class QMenu;
 class QProgressBar;
 class QProgressDialog;
diff --git a/src/qt/guiutil.cpp b/src/qt/guiutil.cpp
index 1337bad3105219..e8b6c93a843894 100644
--- a/src/qt/guiutil.cpp
+++ b/src/qt/guiutil.cpp
@@ -1901,4 +1901,35 @@ void LogQtInfo()
     }
 }
 
+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 5ef5b96a0cc596..d5c7b45a866ffb 100644
--- a/src/qt/guiutil.h
+++ b/src/qt/guiutil.h
@@ -473,7 +473,7 @@ 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);
@@ -482,6 +482,44 @@ namespace GUIUtil
      * Writes to debug.log short info about the used Qt and the host system.
      */
     void LogQtInfo();
+
+    /**
+     * 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/optionsdialog.cpp b/src/qt/optionsdialog.cpp
index b74646a95ead72..9524d682baf997 100644
--- a/src/qt/optionsdialog.cpp
+++ b/src/qt/optionsdialog.cpp
@@ -125,7 +125,11 @@ OptionsDialog::OptionsDialog(QWidget *parent, bool enableWallet) :
     pageButtons->addButton(ui->btnDisplay, pageButtons->buttons().size());
     pageButtons->addButton(ui->btnAppearance, pageButtons->buttons().size());
 
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
+    connect(pageButtons, &QButtonGroup::idClicked, this, &OptionsDialog::showPage);
+#else
     connect(pageButtons, QOverload<int>::of(&QButtonGroup::buttonClicked), this, &OptionsDialog::showPage);
+#endif
 
     showPage(0);
 
diff --git a/src/qt/optionsmodel.cpp b/src/qt/optionsmodel.cpp
index 5266c83ee48047..d5b092ea5bf503 100644
--- a/src/qt/optionsmodel.cpp
+++ b/src/qt/optionsmodel.cpp
@@ -367,7 +367,7 @@ 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 0a8966fa1c08c3..1808fd8d7f9941 100644
--- a/src/qt/overviewpage.cpp
+++ b/src/qt/overviewpage.cpp
@@ -20,6 +20,7 @@
 #include <cmath>
 
 #include <QAbstractItemDelegate>
+#include <QDateTime>
 #include <QPainter>
 #include <QSettings>
 #include <QTimer>
diff --git a/src/qt/paymentserver.cpp b/src/qt/paymentserver.cpp
index ee784f12f82b85..55a92ebe009193 100644
--- a/src/qt/paymentserver.cpp
+++ b/src/qt/paymentserver.cpp
@@ -27,7 +27,6 @@
 #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 531cccc5a73e23..7f6d5312727b57 100644
--- a/src/qt/qrimagewidget.cpp
+++ b/src/qt/qrimagewidget.cpp
@@ -105,15 +105,12 @@ 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());
@@ -128,7 +125,7 @@ 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())
@@ -139,14 +136,14 @@ 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 7eab9f8457b3cc..7c423b51639eff 100644
--- a/src/qt/rpcconsole.cpp
+++ b/src/qt/rpcconsole.cpp
@@ -37,6 +37,7 @@
 #include <QButtonGroup>
 #include <QDir>
 #include <QFontDatabase>
+#include <QDateTime>
 #include <QKeyEvent>
 #include <QMenu>
 #include <QMessageBox>
@@ -515,7 +516,11 @@ RPCConsole::RPCConsole(interfaces::Node& node, QWidget* parent, Qt::WindowFlags
     pageButtons->addButton(ui->btnNetTraffic, pageButtons->buttons().size());
     pageButtons->addButton(ui->btnPeers, pageButtons->buttons().size());
     pageButtons->addButton(ui->btnRepair, pageButtons->buttons().size());
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
+    connect(pageButtons, &QButtonGroup::idClicked, this, &RPCConsole::showPage);
+#else
     connect(pageButtons, QOverload<int>::of(&QButtonGroup::buttonClicked), this, &RPCConsole::showPage);
+#endif
 
     showPage(ToUnderlying(TabTypes::INFO));
 
diff --git a/src/qt/rpcconsole.h b/src/qt/rpcconsole.h
index a3019d528dca5d..febc46c9b17eb8 100644
--- a/src/qt/rpcconsole.h
+++ b/src/qt/rpcconsole.h
@@ -30,6 +30,7 @@ namespace Ui {
 
 QT_BEGIN_NAMESPACE
 class QButtonGroup;
+class QDateTime;
 class QMenu;
 class QItemSelection;
 QT_END_NAMESPACE
diff --git a/src/qt/sendcoinsdialog.cpp b/src/qt/sendcoinsdialog.cpp
index 27b631de700d5a..c5f14b5506a2de 100644
--- a/src/qt/sendcoinsdialog.cpp
+++ b/src/qt/sendcoinsdialog.cpp
@@ -205,8 +205,15 @@ 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);
         CAmount requiredFee = model->wallet().getRequiredFee(1000);
         ui->customFee->SetMinValue(requiredFee);
diff --git a/src/qt/signverifymessagedialog.cpp b/src/qt/signverifymessagedialog.cpp
index 6b0fd0fbea9c2f..3b7d0ef801471e 100644
--- a/src/qt/signverifymessagedialog.cpp
+++ b/src/qt/signverifymessagedialog.cpp
@@ -31,7 +31,11 @@ SignVerifyMessageDialog::SignVerifyMessageDialog(QWidget* parent) :
     pageButtons = new QButtonGroup(this);
     pageButtons->addButton(ui->btnSignMessage, pageButtons->buttons().size());
     pageButtons->addButton(ui->btnVerifyMessage, pageButtons->buttons().size());
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
+    connect(pageButtons, &QButtonGroup::idClicked, this, &SignVerifyMessageDialog::showPage);
+#else
     connect(pageButtons, QOverload<int>::of(&QButtonGroup::buttonClicked), this, &SignVerifyMessageDialog::showPage);
+#endif
 
     // These icons are needed on Mac also
     GUIUtil::setIcon(ui->addressBookButton_SM, "address-book");
diff --git a/src/qt/splashscreen.cpp b/src/qt/splashscreen.cpp
index 1e56981a08ce6f..43f84f79e50976 100644
--- a/src/qt/splashscreen.cpp
+++ b/src/qt/splashscreen.cpp
@@ -28,8 +28,8 @@
 #include <QScreen>
 
 
-SplashScreen::SplashScreen(interfaces::Node& node, Qt::WindowFlags f, const NetworkStyle *networkStyle) :
-    QWidget(nullptr, f), curAlignment(0), m_node(node)
+SplashScreen::SplashScreen(interfaces::Node& node, const NetworkStyle *networkStyle) :
+    QWidget(), curAlignment(0), m_node(node)
 {
 
     // transparent background
diff --git a/src/qt/splashscreen.h b/src/qt/splashscreen.h
index ad6019a4304b25..86858dd84825ae 100644
--- a/src/qt/splashscreen.h
+++ b/src/qt/splashscreen.h
@@ -28,7 +28,7 @@ class SplashScreen : public QWidget
     Q_OBJECT
 
 public:
-    explicit SplashScreen(interfaces::Node& node, Qt::WindowFlags f, const NetworkStyle *networkStyle);
+    explicit SplashScreen(interfaces::Node& node, const NetworkStyle *networkStyle);
     ~SplashScreen();
 
 protected:
diff --git a/src/qt/transactionview.cpp b/src/qt/transactionview.cpp
index 00a86857c76ecc..c4fa4a24ebf804 100644
--- a/src/qt/transactionview.cpp
+++ b/src/qt/transactionview.cpp
@@ -241,7 +241,7 @@ 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();
@@ -289,30 +289,30 @@ 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:
@@ -666,8 +666,8 @@ void TransactionView::dateRangeChanged()
     settings.setValue("transactionDateTo", dateTo->date().toString(PERSISTENCE_DATE_FORMAT));
 
     transactionProxyModel->setDateRange(
-            QDateTime(dateFrom->date()),
-            QDateTime(dateTo->date()));
+            GUIUtil::StartOfDay(dateFrom->date()),
+            GUIUtil::StartOfDay(dateTo->date()));
 }
 
 void TransactionView::focusTransaction(const QModelIndex &idx)