It appears that QDate::shortDayName(), QDate::longDayName(), QDate::shortMonthName() and QDate::longMonthName() ignore the locale set with QLocale::setDefault() and use the system locale instead. Is this the expected behaviour?

Example code:

// Both of these are set to the same localized string
ui->label->setText(QDate::longDayName(1));
QLocale::setDefault(QLocale::English);
ui->label_2->setText(QDate::longDayName(1));