How to use the calendar-utils.getDayViewHourGrid function in calendar-utils

function updateDays() {

      vm.dayViewSplit = parseInt(vm.dayViewSplit);
      var dayStart = (vm.dayViewStart || '00:00').split(':');
      var dayEnd = (vm.dayViewEnd || '23:59').split(':');
      vm.hourGrid = calendarUtils.getDayViewHourGrid({
        viewDate: vm.view === 'week' ? moment(vm.viewDate).startOf('week').toDate() : moment(vm.viewDate).toDate(),
        hourSegments: 60 / vm.dayViewSplit,
        dayStart: {
          hour: dayStart[0],
          minute: dayStart[1]
        },
        dayEnd: {
          hour: dayEnd[0],
          minute: dayEnd[1]
        }
      });

      vm.hourGrid.forEach(function(hour) {
        hour.segments.forEach(function(segment) {

          segment.date = moment(segment.date);