code: def centerOnDateTime(self, dtime):
          
          view = self.uiGanttVIEW
          scene = view.scene()
          point = view.mapToScene(0, 0)
          x = scene.datetimeXPos(dtime)
          y = point.y()
          view.centerOn(x, y)
docs: Centers the view on a given datetime for the gantt widget.
          
          :param      dtime | <QDateTime>