QDateTime from string (DATE) invalid

Question

When im running the following code the qdatetime is invalid:

QString dateString = QString(__DATE__).simplified();
QDateTime date =  QDateTime::fromString(dateString, "MMM d yyyy");
qDebug() << "Build date " << date.toMSecsSinceEpoch();

The content of dateString = Jul 14 2020 so there are no extra spaces. Why is it not working. The following code works fine:

qDebug() << "Build date 2" << QDateTime(QLocale("en_US").toDate(QString(__DATE__).simplified(), "MMM d yyyy")).toMSecsSinceEpoch();

It has the same date format and is also based on __DATE__.

The output is:

Build date  -3600000
Build date 2 1594677600000

My Complete code:

#include <QCoreApplication>
#include <QDate>
#include <QDebug>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    QString dateString = QString(__DATE__).simplified();
    QDateTime date =  QDateTime::fromString(dateString, "MMM d yyyy");
    qDebug() << "Build date " << date.toMSecsSinceEpoch();    
    qDebug() << "Build date 2" << QDateTime(QLocale("en_US").toDate(QString(__DATE__).simplified(), "MMM d yyyy")).toMSecsSinceEpoch();

    return a.exec();
}

I am running on ubuntu 18.04.

@waqar the result is that variable date is invalid, i was expecting it to be valid. — Sven van den Boogaart, Jul 14 '20 at 12:18
@Waqar QDateTime date is literally invalid. I updated the answer to both contain a datetime,. — Sven van den Boogaart, Jul 14 '20 at 12:31
Did you check this post : https://stackoverflow.com/questions/17472735/qdatetimefromstring-date-mmm-d-yyyy-returns-invalid ? The problem looks very similar (my apologies if it does not help). — Erel, Jul 14 '20 at 12:45
@erel Yes I copied it from there but dont understand why the accepted answer is not working for me. — Sven van den Boogaart, Jul 14 '20 at 12:46
Can you try `QLocale::system()` instead of `QLocale("en_US")` and tell what the output is? — Waqar, Jul 14 '20 at 12:56
The language of your OS is probably different than English. Qt expects that date will be provided in the OS language. — pklimczu, Jul 14 '20 at 13:00
@Waqar that I get the same result as the first instance. (invalid) — Sven van den Boogaart, Jul 14 '20 at 13:19

Waqar · Accepted Answer · 2020-07-14T13:42:06.863

2

From QDateTime::fromString() (Qt 5.12) documentation:

Note: Unlike the other version of this function, day and month names must be given in the user's local language. It is only possible to use the English names if the user's language is English.

Your system locale must be something other than English, so that's why it fails to work.

edited Jul 14 '20 at 13:42

answered Jul 14 '20 at 12:31

Waqar

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