diff --git a/src/qt/bitcoingui.cpp b/src/qt/bitcoingui.cpp
index c57eab8d21f..a92675fb14b 100644
--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -594,8 +594,8 @@ void BitcoinGUI::setClientModel(ClientModel *_clientModel, interfaces::BlockAndH
         connect(_clientModel, &ClientModel::numConnectionsChanged, this, &BitcoinGUI::setNumConnections);
         connect(_clientModel, &ClientModel::networkActiveChanged, this, &BitcoinGUI::setNetworkActive);
 
-        modalOverlay->setKnownBestHeight(tip_info->header_height, QDateTime::fromTime_t(tip_info->header_time));
-        setNumBlocks(tip_info->block_height, QDateTime::fromTime_t(tip_info->block_time), tip_info->verification_progress, false, SynchronizationState::INIT_DOWNLOAD);
+        modalOverlay->setKnownBestHeight(tip_info->header_height, QDateTime::fromSecsSinceEpoch(tip_info->header_time));
+        setNumBlocks(tip_info->block_height, QDateTime::fromSecsSinceEpoch(tip_info->block_time), tip_info->verification_progress, false, SynchronizationState::INIT_DOWNLOAD);
         connect(_clientModel, &ClientModel::numBlocksChanged, this, &BitcoinGUI::setNumBlocks);
 
         // Receive and report messages from client model
diff --git a/src/qt/clientmodel.cpp b/src/qt/clientmodel.cpp
index bb2073b9fea..c86cb16af66 100644
--- a/src/qt/clientmodel.cpp
+++ b/src/qt/clientmodel.cpp
@@ -216,7 +216,7 @@ bool ClientModel::isReleaseVersion() const
 
 QString ClientModel::formatClientStartupTime() const
 {
-    return QDateTime::fromTime_t(GetStartupTime()).toString();
+    return QDateTime::fromSecsSinceEpoch(GetStartupTime()).toString();
 }
 
 QString ClientModel::dataDir() const
@@ -294,7 +294,7 @@ static void BlockTipChanged(ClientModel* clientmodel, SynchronizationState sync_
 
     bool invoked = QMetaObject::invokeMethod(clientmodel, "numBlocksChanged", Qt::QueuedConnection,
         Q_ARG(int, tip.block_height),
-        Q_ARG(QDateTime, QDateTime::fromTime_t(tip.block_time)),
+        Q_ARG(QDateTime, QDateTime::fromSecsSinceEpoch(tip.block_time)),
         Q_ARG(double, verificationProgress),
         Q_ARG(bool, fHeader),
         Q_ARG(SynchronizationState, sync_state));
diff --git a/src/qt/guiutil.cpp b/src/qt/guiutil.cpp
index ecdfce2f5a4..e98e50ba148 100644
--- a/src/qt/guiutil.cpp
+++ b/src/qt/guiutil.cpp
@@ -81,7 +81,7 @@ QString dateTimeStr(const QDateTime &date)
 
 QString dateTimeStr(qint64 nTime)
 {
-    return dateTimeStr(QDateTime::fromTime_t((qint32)nTime));
+    return dateTimeStr(QDateTime::fromSecsSinceEpoch(nTime));
 }
 
 QFont fixedPitchFont(bool use_embedded_font)
diff --git a/src/qt/recentrequeststablemodel.cpp b/src/qt/recentrequeststablemodel.cpp
index ec3d970a7ff..ab8225e19ff 100644
--- a/src/qt/recentrequeststablemodel.cpp
+++ b/src/qt/recentrequeststablemodel.cpp
@@ -234,7 +234,7 @@ bool RecentRequestEntryLessThan::operator()(const RecentRequestEntry& left, cons
     switch(column)
     {
     case RecentRequestsTableModel::Date:
-        return pLeft->date.toTime_t() < pRight->date.toTime_t();
+        return pLeft->date.toSecsSinceEpoch() < pRight->date.toSecsSinceEpoch();
     case RecentRequestsTableModel::Label:
         return pLeft->recipient.label < pRight->recipient.label;
     case RecentRequestsTableModel::Message:
diff --git a/src/qt/recentrequeststablemodel.h b/src/qt/recentrequeststablemodel.h
index b817b64e77b..c489c0eaf4a 100644
--- a/src/qt/recentrequeststablemodel.h
+++ b/src/qt/recentrequeststablemodel.h
@@ -7,6 +7,8 @@
 
 #include <qt/sendcoinsrecipient.h>
 
+#include <string>
+
 #include <QAbstractTableModel>
 #include <QStringList>
 #include <QDateTime>
@@ -26,9 +28,9 @@ public:
 
     SERIALIZE_METHODS(RecentRequestEntry, obj) {
         unsigned int date_timet;
-        SER_WRITE(obj, date_timet = obj.date.toTime_t());
+        SER_WRITE(obj, date_timet = obj.date.toSecsSinceEpoch());
         READWRITE(obj.nVersion, obj.id, date_timet, obj.recipient);
-        SER_READ(obj, obj.date = QDateTime::fromTime_t(date_timet));
+        SER_READ(obj, obj.date = QDateTime::fromSecsSinceEpoch(date_timet));
     }
 };
 
diff --git a/src/qt/rpcconsole.cpp b/src/qt/rpcconsole.cpp
index 56f55363b26..ba3eb80efa5 100644
--- a/src/qt/rpcconsole.cpp
+++ b/src/qt/rpcconsole.cpp
@@ -651,7 +651,7 @@ void RPCConsole::setClientModel(ClientModel *model, int bestblock_height, int64_
         setNumConnections(model->getNumConnections());
         connect(model, &ClientModel::numConnectionsChanged, this, &RPCConsole::setNumConnections);
 
-        setNumBlocks(bestblock_height, QDateTime::fromTime_t(bestblock_date), verification_progress, false);
+        setNumBlocks(bestblock_height, QDateTime::fromSecsSinceEpoch(bestblock_date), verification_progress, false);
         connect(model, &ClientModel::numBlocksChanged, this, &RPCConsole::setNumBlocks);
 
         updateNetworkState();
diff --git a/src/qt/transactionfilterproxy.cpp b/src/qt/transactionfilterproxy.cpp
index 75cbd6b3be5..57c05a647ed 100644
--- a/src/qt/transactionfilterproxy.cpp
+++ b/src/qt/transactionfilterproxy.cpp
@@ -7,7 +7,9 @@
 #include <qt/transactiontablemodel.h>
 #include <qt/transactionrecord.h>
 
+#include <algorithm>
 #include <cstdlib>
+#include <optional>
 
 TransactionFilterProxy::TransactionFilterProxy(QObject *parent) :
     QSortFilterProxyModel(parent),
diff --git a/src/qt/transactiontablemodel.cpp b/src/qt/transactiontablemodel.cpp
index b68ceaedbba..23590ea4d24 100644
--- a/src/qt/transactiontablemodel.cpp
+++ b/src/qt/transactiontablemodel.cpp
@@ -610,7 +610,7 @@ QVariant TransactionTableModel::data(const QModelIndex &index, int role) const
     case TypeRole:
         return rec->type;
     case DateRole:
-        return QDateTime::fromTime_t(static_cast<uint>(rec->time));
+        return QDateTime::fromSecsSinceEpoch(rec->time);
     case WatchonlyRole:
         return rec->involvesWatchAddress;
     case WatchonlyDecorationRole:
@@ -630,7 +630,7 @@ QVariant TransactionTableModel::data(const QModelIndex &index, int role) const
     case TxPlainTextRole:
         {
             QString details;
-            QDateTime date = QDateTime::fromTime_t(static_cast<uint>(rec->time));
+            QDateTime date = QDateTime::fromSecsSinceEpoch(rec->time);
             QString txLabel = walletModel->getAddressTableModel()->labelForAddress(QString::fromStdString(rec->address));
 
             details.append(date.toString("M/d/yy HH:mm"));