Changing language for QDate

[kaszewczyk]

Hello,
I have a question about toString(QString format) method of QDate class.
I want to get short name of current month, so I entered format toString("MMM"), everything is ok, but this method returned me short month name in my language and I want it to be short month name in English, is it possible to change language of QDate ?

Best Regards
kaszewczyk

[stampede]

This is how QDate is creating the short month name:

QString QDate::shortMonthName(int month, QDate::MonthNameType type)
{
    if (month < 1 || month > 12) {
        month = 1;
    }
    switch (type) {
    case QDate::DateFormat:
        return QLocale::system().monthName(month, QLocale::ShortFormat);
    case QDate::StandaloneFormat:
        return QLocale::system().standaloneMonthName(month, QLocale::ShortFormat);
    default:
        break;
    }
    return QString();
}

QString QDate::shortMonthName(int month, QDate::MonthNameType type)
{
    if (month < 1 || month > 12) {
        month = 1;
    }
    switch (type) {
    case QDate::DateFormat:
        return QLocale::system().monthName(month, QLocale::ShortFormat);
    case QDate::StandaloneFormat:
        return QLocale::system().standaloneMonthName(month, QLocale::ShortFormat);
    default:
        break;
    }
    return QString();
}

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It's using system locale. From the documentation of QLocale :: system:

On Windows and Mac, this locale will use the decimal/grouping characters and date/time formats specified in the system configuration panel.

So I think easiest way will be to write your own class for translatable QDate with custom toString(), and use QLocale::monthName method, something like:

#include <QApplication>
#include <QDebug>
#include <QDate>
 
class MyDate
{
public:
	MyDate(const QDate& d, const QLocale& loc = QLocale()) : _date(d), _loc(loc)
	{}
	void setLocale(const QLocale& loc){
		this->_loc = loc;
	}
	void setDate(const QDate& d){
		this->_date = d;
	}
	QDate date() const{
		return this->_date;
	}
	QString toString() const{
		return QString("%1 %2 %3").arg(_date.day())
					.arg( _loc.monthName(_date.month(), QLocale::ShortFormat) )
					.arg(_date.year());
	}
protected:
	QDate _date;
	QLocale _loc;
};
 
int main(int argc, char **argv) {
    MyDate date( QDate::currentDate(), QLocale::English );
 
    qDebug() << date.toString();
 
    return 0;
}

#include <QApplication>
#include <QDebug>
#include <QDate>
 
class MyDate
{
public:
	MyDate(const QDate& d, const QLocale& loc = QLocale()) : _date(d), _loc(loc)
	{}
	void setLocale(const QLocale& loc){
		this->_loc = loc;
	}
	void setDate(const QDate& d){
		this->_date = d;
	}
	QDate date() const{
		return this->_date;
	}
	QString toString() const{
		return QString("%1 %2 %3").arg(_date.day())
					.arg( _loc.monthName(_date.month(), QLocale::ShortFormat) )
					.arg(_date.year());
	}
protected:
	QDate _date;
	QLocale _loc;
};
 
int main(int argc, char **argv) {
    MyDate date( QDate::currentDate(), QLocale::English );
    
    qDebug() << date.toString();
    
    return 0;
}

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Maybe there is easier way, but I'm not aware of it now.

[pataliz0r]

More then half an year has passed since this thread was last answered. But anyways here's how I did it, if its helps someone else

QDate date = QDateTime::currentDateTime().date();
QLocale locale  = QLocale(QLocale::Swedish, QLocale::Sweden); // set the locale you want here
QString swedishDate = locale.toString(date, "dddd, d MMMM yyyy");

QDate date = QDateTime::currentDateTime().date();
QLocale locale  = QLocale(QLocale::Swedish, QLocale::Sweden); // set the locale you want here
QString swedishDate = locale.toString(date, "dddd, d MMMM yyyy");

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cheers