If the \a format is Qt::ISODate, the string format corresponds
to the ISO 8601 extended specification for representations of
- dates and times, taking the form YYYY-MM-DDTHH:MM:SS.
+ dates and times, taking the form YYYY-MM-DDTHH:MM:SS[Z|[+|-]HH:MM],
+ depending on the timeSpec() of the QDateTime. If the timeSpec()
+ is Qt::UTC, Z will be appended to the string; if the timeSpec() is
+ Qt::OffsetFromUTC the offset in hours and minutes from UTC will
+ be appended to the string.
If the \a format is Qt::SystemLocaleShortDate or
Qt::SystemLocaleLongDate, the string format depends on the locale