Custom sortable columns in QFileSystemModel

[Christian Ehrlicher]

Thast's why https://doc.qt.io/qt-6/qfilesystemmodel.html#lastModified is there.

[JonB]

@Jo-Jo
I now see that, and see from https://codebrowser.dev/qt5/qtbase/src/widgets/dialogs/qfilesystemmodel.cpp.html#737 that it is called in the implementation of QFileSystemModel::data() for column #3, which is what I needed to know.

I also see it is formatted as a string with QLocale::ShortFormat. I don't know what that looks like, I don't know how "precise" it is (e.g. down to, say, milliseconds or likely not?), I don't know what the locale-aware formatting does with it. Putting all these together it would not surprise me if it is unsuitable for sorting, and/or for converting back (accurately) to a datetime/comparing. Whereas the birthTime() you use for your extra column is indeed a datetime type and is suitable.

Hence, as both I and @Christian-Ehrlicher have said, I would use lastModified() just as you use birthDate() for this column in your own code for data() method.

[Jo Jo]

@Christian-Ehrlicher @JonB agree with you guys about lastModified, thanks!