QDateTime::currentDateTime() sometimes return ???

asmant

Hello, in my windows app's logs I get current date-time like this:

QDateTime dateTime = dateTime.currentDateTime();
QString currentDateTime = dateTime.toString("yyyy-MM-dd HHmmss");

It worked well until I noticed that sometimes the time is ????-??-?? ??:??:??. How it can be that way? I know that windows time can be incorrect, but it should return incorrect time and not ???

jsulm

@asmant How do you write currentDateTime to the log?

asmant

@jsulm

   QDateTime dateTime = dateTime.currentDateTime();
   QFile file(filePath);

   QTextStream out(&file);
   out << dateTime.toString("yyyy-MM-dd HH:mm:ss") << endl;
   out << m_logData;

asmant

So, I find out that, for example if the windows language is Egypt(arabic) so the time & date is displayed not in english numbers. It is in Egypt(arabic) writing. Is there a function to get (format) time & date in English language numbers?

J.Hilk

@asmant
That's what QLocale is for :)

QLocale::dateTimeFormat

asmant

@J-Hilk I have set locale to English in the main.cpp. Do I have to do it somewhere else?

   QLocale locale = QLocale(QLocale::English);
   QLocale::setDefault(locale);

Cobra91151

@asmant

Hello!

@J-Hilk meant to use the dateTimeFormat (https://doc.qt.io/qt-5/qlocale.html#dateTimeFormat) function, it will return the date format used for the current locale.

Also, you can try out my solution:

QLocale testLocale = QLocale(QLocale::English, QLocale::UnitedStates);
QString dateTimeText = testLocale.toString(QDateTime::currentDateTime(), "dddd / dd / MMMM / yyyy / hh:mm:ss AP");
qDebug() << dateTimeText;

It will display date time using English locale (United States). You can change QLocale and format it to your needs. Happy coding!

asmant

@Cobra91151 That's what I wanted to do. Thank you!