There is also such a problem in the 6.5 version of Qt

//sample code

QLocale locale(QLocale::English, QLocale::UnitedStates);

QDateTime qt = locale.toDateTime("Mon, 05 Jun 2023 08:42:09", "ddd, dd MMM yyyy hh:mm:ss");
//In the Chinese system, The following line of code will output "Mon, 05 Jun 2023 08:42:09 中国标准时间"
qDebug()<<locale.toString(qt,"ddd, dd MMM yyyy hh:mm:ss t");