Qt ISO 8601 time support

[kangaba]

Hi,
Can any Qt5 time related class deal with time formatted as "PT23H12M48S"?
I tried QTime and QDateTime and none works.

Example:
QString str = "PT23H12M48S";
auto t = QDateTime::fromString(str);
qDebug() << "time is:" << t.toString("HH:mm::ss"); // prints empty string

[ChrisW67]

That encoding is not the time but a duration (or part of a time interval), i.e. 23 hours, 12 minutes and 48 seconds not 11:12:48 PM. Nothing I am aware of handles that directly in Qt. You could disassemble it with a QRegularExpression and build a number of seconds fairly easily, but there are quite a few variations you need to be careful of in the standard. You also need to be careful if you are adding durations to absolute times around daylight savings changes.

[kangaba]

Thanks for the intelligent answer. Right, that's a duration. For some reason the ODF standard (LibreOffice) stores time values in this format. Alright, I'll parse it back and forth myself.

[ChrisW67]

ISO 8601 also defines a format for absolute time and date, i.e. YYYY-MM-DDThh:mm:ss, and that is handled by Qt's QDateTime.

AFAICT the ODF uses both XML dateTime and duration (inspired by ISO 8601) in different contexts.