How to represent QDateTime data in QTableView in needed format?

[falconium]

I have a source QStandardItemModel in which I have stored data for an object. Its first column has QDateTime values (modelTable->setData(modelTable->index(i, 2, QModelIndex()), timedate).
I want to create a new model for a QTableView by copying modelTable data into modelChart model, but I also want to have the QDateTime variable displayed in different format, e.g. ISO or localized.

How can I do this? I haven't found the method for this.
I played with DisplayRole, but didn't help.

for (int i=0; i<modelTable->rowCount(); i++)
        {
            modelChart->setItem(i, 0, new QStandardItem());
            modelChart->setData(modelChart->index(i, 0, QModelIndex()), modelTable->item(i, 2)->data(Qt::EditRole));
            modelChart->setData(modelChart->index(i, 0, QModelIndex()), modelTable->item(i, 2)->data(Qt::EditRole), Qt::DisplayRole);
            modelChart->setItem(i, 1, new QStandardItem(modelTable->item(i, 3)->text()));
            modelChart->setData(modelChart->index(i, 1, QModelIndex()),QColor(r, g, b),Qt::DecorationRole);
        }

for (int i=0; i<modelTable->rowCount(); i++)
        {
            modelChart->setItem(i, 0, new QStandardItem());
            modelChart->setData(modelChart->index(i, 0, QModelIndex()), modelTable->item(i, 2)->data(Qt::EditRole));
            modelChart->setData(modelChart->index(i, 0, QModelIndex()), modelTable->item(i, 2)->data(Qt::EditRole), Qt::DisplayRole);
            modelChart->setItem(i, 1, new QStandardItem(modelTable->item(i, 3)->text()));
            modelChart->setData(modelChart->index(i, 1, QModelIndex()),QColor(r, g, b),Qt::DecorationRole);
        }

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Thanks in advance!