Port away from deprecated QDateTime methods

plugins/mediaplayer/mediamodel.cpp

@@ -77,7 +77,7 @@ QVariant MediaModel::data(const QModelIndex &index, int role) const
     case Qt::UserRole: // user role is for finding out if a torrent is complete
         return mf->fullyAvailable();
     case Qt::UserRole + 1:
-        return QFileInfo(mf->path()).lastModified().toTime_t();
+        return QFileInfo(mf->path()).lastModified().toSecsSinceEpoch();
     default:
         return QVariant();
     }

plugins/syndication/feedwidget.cpp

@@ -186,7 +186,7 @@ void FeedWidget::selectionChanged(const QItemSelection &sel, const QItemSelectio
         Syndication::ItemPtr item = model->itemForIndex(m_item_list->selectionModel()->selectedRows().front());
         if (item) {
             m_item_view->setHtml(item_template.arg(item->title())
-                                     .arg(QLocale().toString(QDateTime::fromTime_t(item->datePublished()), QLocale::ShortFormat))
+                                     .arg(QLocale().toString(QDateTime::fromSecsSinceEpoch(item->datePublished()), QLocale::ShortFormat))
                                      .arg(item->description())
                                      .arg(QApplication::palette().text().color().name(QColor::NameFormat::HexRgb)),
                                  QUrl(feed->feedData()->link()));

plugins/syndication/feedwidgetmodel.cpp

@@ -96,7 +96,7 @@ QVariant FeedWidgetModel::data(const QModelIndex &index, int role) const
         case 0:
             return item->title();
         case 1:
-            return QLocale().toString(QDateTime::fromTime_t(item->datePublished()), QLocale::ShortFormat);
+            return QLocale().toString(QDateTime::fromSecsSinceEpoch(item->datePublished()), QLocale::ShortFormat);
         case 2:
             return TorrentUrlFromItem(item);
         default: