QDateTimeEdit : Dumb Mistake or bug?

[ChrisW67]

This code:

#include <QApplication>
#include <QDateTimeEdit>
 
int main(int argc, char **argv)
{
    QApplication app(argc, argv);
 
    QDateTimeEdit edit;
    edit.setDateTime(QDateTime::currentDateTimeUtc());
    edit.setDisplayFormat("yyyy-MM-dd hh:mm");
    edit.setSelectedSection(QDateTimeEdit::DaySection);
    // also tried these:
    // edit.setCurrentSection(QDateTimeEdit::DaySection);
    // edit.setCurrentSectionIndex(2);
    edit.show();
 
    return app.exec();
}

#include <QApplication>
#include <QDateTimeEdit>

int main(int argc, char **argv)
{
    QApplication app(argc, argv);

    QDateTimeEdit edit;
    edit.setDateTime(QDateTime::currentDateTimeUtc());
    edit.setDisplayFormat("yyyy-MM-dd hh:mm");
    edit.setSelectedSection(QDateTimeEdit::DaySection);
    // also tried these:
    // edit.setCurrentSection(QDateTimeEdit::DaySection);
    // edit.setCurrentSectionIndex(2);
    edit.show();

    return app.exec();
}

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I would have expected to show the current time with the "dd" day field already selected. What I get with 4.8.5/5.1.0 on 64-bit Linux, and 4.8.4 on 32-bit Windows is the year (first, presumably default) section selected. I have also tried deferring the setSelectedSection() call until after the show() with a zero timer. Meanwhile the currentSection() property returns 0x100, i.e. the DaySection.

Am I missing the absolutely obvious?