Fix time showing applets not showing correct time for some timezones

Apparently passing QDateTime::time() to the Qt.formatTime is messing
things up; might also be a Qt bug, on the other hand the docs for QTime
say that "Unlike QDateTime, QTime knows nothing about time zones or
daylight savings time (DST)".

Passing the full QDateTime object makes the applets show correct time in
all timezones.

Hats off to Andreas Eckstein for finding out this