A very big problem with QDateTime

mrdebug

Todat is Tuesday and according with Qt manual Qt::Tuesday= 2 but
If I run
qDebug() << "dayOfWeek" << QDateTime::currentDateTime().date().dayOfWeek();
I obain
dayOfWeek 3
3 means Wednesday.

qDebug() << "dayOfWeek" << QDateTime::currentDateTime().date().dayOfWeek();
qDebug() << "Monday" << (QDateTime::currentDateTime().date().dayOfWeek()== Qt::Monday);
qDebug() << "Tuesday" << (QDateTime::currentDateTime().date().dayOfWeek()== Qt::Tuesday);
qDebug() << "Wednesday" << (QDateTime::currentDateTime().date().dayOfWeek()== Qt::Wednesday);
qDebug() << "Thursday" << (QDateTime::currentDateTime().date().dayOfWeek()== Qt::Thursday);
qDebug() << "Friday" << (QDateTime::currentDateTime().date().dayOfWeek()== Qt::Friday);
qDebug() << "Saturday" << (QDateTime::currentDateTime().date().dayOfWeek()== Qt::Saturday);
qDebug() << "Sunday" << (QDateTime::currentDateTime().date().dayOfWeek()== Qt::Sunday);

And now? What can I do to set Monday as first day of the week globally?

hskoglund

Hi, you're sure it's Tuesday today? At least here in Sweden it's Wednesday :-)

yeckel

It really seems to be working and fine. Snippets from Qt5.6 sources:

int floordiv(int a, int b){
    return (a - (a < 0 ? b-1 : 0)) / b;
}

qint64 julianDayFromDate(int year, int month, int day)
{
// Adjust for no year 0
if (year < 0)
    ++year;
int    a = floordiv(14 - month, 12);
qint64 y = (qint64)year + 4800 - a;
int    m = month + 12 * a - 3;
return day + floordiv(153 * m + 2, 5) + 365 * y + floordiv(y, 4) - floordiv(y, 100) + floordiv(y, 400) - 32045;
}

int dayOfWeek(){
qint64 jd = julianDayFromDate(2015,11,17);
if (jd >= 0)
    return (jd % 7) + 1;
else
    return ((jd + 1) % 7) + 7;
}

int main(int argc, char *argv[]){
    qDebug() << dayOfWeek();
}

mrdebug

Oh, shit!
It's' already wednesday!!
Sorry, I think I need an holiday.

mrjj

@mrdebug
hehe Best bug ever :))