CalendarModel returns months with indexed [1-12] instead of [0-11]

ListView {
      id: listview
      width: 200; height: 200
      snapMode: ListView.SnapOneItem
      orientation: ListView.Horizontal
      highlightRangeMode: ListView.StrictlyEnforceRange

      model: CalendarModel {
          from: new Date(2015, 0, 1)
          to: new Date(2015, 11, 31)
      }

      delegate: MonthGrid {
          width: listview.width
          height: listview.height
          month: model.month
          year: model.year
      }
  }