Change language of date

[helenebro]

Hi,
I want display an date on a app but the language isn't correct.

var dateProgramme = Date.fromLocaleString(Qt.locale("en_US"), previewInfo.dataCurrentItem.dateDiffusion, "dd/MM/yyyy")
console.log(dateProgramme); // Display date in french : "lun. févr. 15 00:00:00 2016 GMT+0100"

I have tried to change qlocale language on main.cpp but it change nothing. (It seems language is only change on cpp).

QLocale curLocale(QLocale("en_US"));
QLocale::setDefault(curLocale);
QDate date = QDate::currentDate();
QString dateString = QLocale().toString(date);
qDebug() << dateString; //Display date in english:  "Monday, February 15, 2016" 

How can I change language on qml ?