Various patterns seem to have been copied, notably counting time from
QTime(0, 0) rather than using QTime::msecsSinceStartOfDay() and its
setter. Unsuitable value types also put in an appearance, and
QTime()'s parameters after the first two default to 0 anyway.
Corrected a lie in QTime()'s default constructor doc; it does not work
the same as QTime(0, 0) at all.
Change-Id: Icf1a10052a049e68fd0f665958f36dbe75ac46d5
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>